"Victory No. Ⅰ" rock pipe mining

Cedric

September 11, 2022 at 4:48 am

3.5.1 The mining of the "Red Flag 1" rock pipe and the mining preparation of the "Victory I" rock pipeline n The country attaches great importance to the discovery of my country's first diamond ore- "Red Flag 1". On August 15, 1966, the Ministry of Building Materials and Geological Department jointly issued a notice. At that time, the building materials 803 ore developed by the Daocheng King Kong Sand Mine at the time established the Mengyin Mining Area to build a construction office, which is responsible for the construction of the "Red Flag 1" mining area. On July 17, 1967, the Ministry of Building Materials decided to rename the "Mongolian Yin Yin Mining Area Preparation Office" of the 803 Mining Mining Mine to "Building Materials 701 Mine Preparation Office", adopting the policy of "side exploration, side design, and construction" to start the first phase Engineering construction, mining "Red Flag 1" mineral. In January 1968, the ground was broken, and it was completed and put into operation in December 1970. It designed and produced 86,500 tons of ore annually and recovered 20,000 carats of diamonds. Mine mining is 40 meters and 80 meters. It adopts a central vertical diagonal ventilation scheme and adopts mining mining method of downstream collapse. The mineral selection plant is located in the Mengyin Songjiazhuang Xishan, which is 14 kilometers away from the mining area. The mineral selection process adopts the solution of gravity minerals, multi -band crushing, first selection and then break, closed circular circulation, and classification selection. The mineral water source is located in the Dongwen River.
In more than three years of common exploration, the "Red Flag 1" circle has a length of 1450 meters, the drilling control depth of about 200 meters, and a local area of 300 meters. Exploring Vajrayana industrial reserves × × Wan -carat, of which B -level × Wankera, C1 level × Wankra, C2 level × Wanchra, submitted an exploration report in 1969. At the same time, the mining of "Red Flag 1" has progressed rapidly. Since the production, it has been explained, mining, and gradually improving the production process. In the middle of 40 meters, the middle section of 80 meters was transferred in 1976. The mining length was 800 meters and 1100 meters, respectively. By September 1980, the cumulative mining for 10 years, a total of reserves × Wankra, accounting for 43.3%of the total mineral reserves, the ore utilization rate is about 76.5%, diamond recovery rate is about 54.5%. Broken grain, low industrial quality. The reserves of more than 180 meters in the middle of the mine have been emptied, and the deep reserves of the depth of the ore body and the middle section of only the remaining ore body.
During the mining process of "Red Flag 1", in September 1969, the "Victory No. Ⅰ" rock pipe with richer reserves, higher quality, and better quality of diamonds was discovered. The state decided to go to Malaysia's second phase of the Malaysians. While mining "Red Flag 1", it was prepared to minimize the "Victory I" rock pipe. In view of the first phase of mining projects based on the construction of "Red Flag 1", it can no longer meet the mining needs of "Victory No. Ⅰ". Mining plant, annual treatment of 96,100 tons of ore, produced 100,000 carats of diamonds. Water source is located in Shuigou, Pingyi County. In December 1975, the ground engineering construction and dewcai preparations were preparations. In May 1980, the "Victory I" was officially mining, and the mining of "Red Flag 1" stopped. In view of the domestic mining experience of diamonds in China, the second phase of the project has also built the selection of 20,000 carat -free medium mixed self -abrasive ore test factories an annual output of diamonds, and conducted a comparison of each other to obtain the best mineral selection process. In the initial stage of "Victory I", due to the initial operation of the new equipment, the operating skills were sparse, and the crushing rate of diamonds reached 80%, the recovery rate of diamonds was less than 50%, and the resources were seriously waste. The mine has been used in time to restrict production and research procurement. Although it has improved, the results are not great.
3.5.2 The technical conditions of the "Victory I" rock pipe mining
(1) Hydrogeological conditions
"Victory No. Ⅰ" rock pipe area is the hilly terrain, and most of the rocks are exposed, only The bottom of the groove valley on the north side of the rock pipe is covered with gravel layer and clay layer, with a thickness of 1 ~ 10 meters, and a small amount of shallow pore water. Kimberley rock and surrounding granite rocks, the fissure development of the fracture, the upper weathering layer is filled by mud or kaolin quality, the water permeability is poor, and the cracks are not much. Mine mining is affected by natural precipitation. The open -air pits are water collecting funnels that accept natural precipitation, which constitutes harm to open -air mining operations. It can also penetrate deep through the original and explosive cracks through rocks, becoming the main object of prevention of underground mining. In addition, there are more than a hundred drilling holes during the exploration of the mining area, and the quality of the holes is not high. It is possible to communicate various cracks to form local water storage space and cause short -term local aphrodisiac.
The dynamic changes in surface water around the mining area Dynamic changes are controlled by the season. The supply source comes from the atmospheric precipitation. The excretion is affected by the terrain and flows out of the north east. The maximum daily flow of the small river in the north side of the rock pipeline was 9272.34 cubic meters, which lasted about 8 hours, and then gradually decreased.
The daily water volume during the open -air mining changes at 183 ~ 274 cubic meters, and the groundwater penetration coefficient is 0.074 meters per day.
The characteristics of the above characteristics, hydrogeological conditions in this area are simple.
(2) Engineering geological conditions
The rock type in the mining area is relatively simple. The type of ore is mainly spotted Jinbelie and Jinbielie Clamp, spots structure, corner gravel or block structure, hardness of 5 ~ 6 There are not many cracks. The minerals of the mines are all rough lithite flashes long rocks in the late ancient sheet, and the rocks are uniform, and the rock hardness is 6 ~ 7. Small breaks can be seen in the east and south of the rock pipe, and the fault structure is relatively close. In part of the parts and southern parts of the north -south edge of the tube, the rock nature is relatively broken, it is prone to collapse, and there are hidden safety hazards. The geological conditions of mining engineering engineering are medium and simple.
(3) Environmental geological conditions
The mining area is located in the high incidence of the high incidence area of the eastern earthquake -the west side of the Yimao Fracture Belt. The north and south sides of the mining area include Mengshan and Xintai-Duozhuang to a broken belt. The two neighbor and new generation structure and magma activities in the east and west neighbors of the mining area are active. In 1668, the Great Earthquake of the Tancheng was affected by it and had a strong sense of earthquake. Previously, Mengyin had not experienced a sense of earthquakes since the record. The mining area is more than 0.2 kilometers from the residential land, and there is no large -area vegetation and farmland. Mining will not cause significant damage to the surrounding natural environment. Mining plants and living areas are mainly built in hillside areas outside the rock pipes. The mining process does not produce toxic, pollution and other substances, and it will not cause harm to the environment. The annual scrap stone of the mine and the mining tail sand is about 5720 cubic meters, which are mainly discharged in the southwest of the minerals. The environmental conditions of "Victory I" are relatively simple.
3.5.3 ore processing technical performance
(1) The physical properties of the ore
ore are various types of Kimbeli Rock, of which 50%of the spotted Jinbieli rocks, about 40%of Kimberley Classes, about 40%, and about 40%, and about 40%, Kimbeli rocky cornea is about 10%. The main composition of the ore contains snake pattern, Jinyun mother, long stone, quartz, etc., all of which are light minerals with a proportion of less than 2.6. The proportion of diamonds is large, and the total content of less rocks is 3%. Kimberley's wind has a wind of about 5 meters, and the color of the deep ore has changed from yellow -green to dark green. The surface or shallow ore is loose, the depth is complete, and the cracks are less. The hardness of the ore is 5.5 ~ 6. It is easily broken by blows or friction, and it is more convenient to process. > 16 mm original ore particle size> 90%. The ore loosening coefficient is 1.53 ~ 1.96, and the average proportion of ore is 2.53.
Ated rocks of minerals are long -term lithite long rocks in late Tai ancient quartz, with numb structures, and medium coarse -grained structures; rock hardness of 6 ~ 7, fissure development; Eclipse is broken, soil is severe, and it is easy to collapse.
(2) The physical properties of diamonds
Tracks of diamonds have some unique physical properties, which can be separated from Jinbelie Rock. The proportion of diamonds is 3.5, and there is a large proportion difference from the goldbelie rock mineral or fenced rock minerals (proportion of 2.5 ~ 2.7), which can be separated by gravity sorting; diamond surface has good hydrophobicity and oil. The method of floating is selected; diamonds have fluorescent light, and they often occur under the X -ray. It is often different from the purple scattered fluorescent light of the phosphorus, vermiculite, and square lipstick. Vajrayana is extremely hard and up to 10 levels. It can withstand great static pressure, but the impact is limited. It can be used by hard -to -juvenile grinds. It is not suitable to strike gravity. In particular, large granules often have native cracks and are prone to crushing after being hit.
The diamond granularity in Jinbieliyan is very different, from> 16 mm to u003C0.5 mm, large, small, larger, the larger the particles, the higher the value, often there are native cracks, which are prone to crushing. Therefore The complete protection of large grain diamond is the priority requirement of the mineral selection. It should be selected by the method of chopping, then crushing, and classification.
3.5.4 "Victory No. Ⅰ" rock pipe mining plan
(1) The scope of the mining area
"Victory No. Ⅰ" rock pipe administrative area belongs to Wangcun, Mengyin County, Mengyin County. The rock pipe is around the hilly area, with a ground elevation of 240 to 288 meters. The southern terrain is high, and the base rocks are exposed. The north is gradually lowered.
The building materials "701" was first established in August 1966. The mining rights were established in 1987. After several changes and continuity, the mining right certificate issued by the Ministry of Land and Resources is now held. The mining area is determined by 11 inflection points, with an area of 0.0895 square kilometers, and the mining depth is from 260 meters to -40 meters (Figure 3-44).
Figure 3-44 "Victory No. Ⅰ" rock pipe mining right range diagram
Figure 3-45 "Victory No. Ⅰ" rock pipe open pit
(2) open-air mining n Since the discovery of "Victory I" rock pipes since September 1969, after 4 years of exploration, a geological exploration report was submitted in December 1972. The ore section of the vertical depth of 600 meters is submitted to the diamond industrial reserves and vision reserves ×× × Wan carat.
In the end of the mine exploration, that is, start to prepare for the "Victory No. Ⅰ" mining project. According to the development plan compiled by the Suzhou Branch of the Non-Metal Mine Design Institute of the Ministry of Building Materials, an open-air mining of the mine section of the rock pipeline is more than 100 meters (Figure 3-45). There are seven steps on the slope of the pits, the width of the countertop is 3 meters, the step slope is 75 °, and the width of the transportation platform is 6 meters. The upper part of the pits is 5 ~ 10 meters high, the lower part of 70 meters is 15 meters high, the final slope angle is 45 °, and the peeling ratio of the open -air pits is 6.0. Ten meters of impact drilling rock blasting, 1 cubic meter of tok -mounted rock, 10 tons of spiral lines in the pits of 10 tons. Starting in December 1972, cleaning the mining site, renovating the pile venue, building a mining plant, and debugging the equipment. In November 1975, the fence began to peel off the feed rocks and some mining of ore. In May 1980, it was officially explained in the open -air. The ore is directly sent to the west side of the rock pipe to enter the crushed process, and the surrounding rock is sent to the southeast of the rock pipeline. After about 14 years of excavation, a funnel -shaped open -air pits formed a funnel -shaped pits of 330 meters long, 230 meters wide from north to south, and 100 meters deep. In 1992, the mines were delayed by 10 meters in accordance with the mining mining conditions, reaching 110 meters deep (elevation 150 meters), and reached the limits of Luxie in 1993. During the open -air mining period, a total of ore reserves were used ××× 10,000 tons, diamond reserves ××× per thousand -carats, and 1.062 million carats of diamonds were selected, and the reserves utilization rate was 74.16%.
(3) Underground mining
After exploiting to the limit, underground mining projects failed to immediately start underground mining projects for various reasons. After many turns, it was not until the establishment of "Mengyin Dai Mengang Stone Co., Ltd." in cooperation with the Canadian CDC company to introduce foreign capital, and it began to prepare for underground mining in February 1994.
The mining feasibility study report below the rock pipe 150 meters below the mine section was compiled in December 1993 by the Chinese Architectural Materials Industry Planning Institute. Mengyin Dai Mengang Stone Co., Ltd. "The preliminary design of the open-air underground project, the design and mining depth of 190 meters ( 150 ~ 40 meters). The mine section has ore × ××× 10,000 tons, diamond reserves ××× 10,000 carats, and the average ore grade is 661.95 mg/cubic meter. The diagonal expansion is used, and the main shafts are oblique wells. The main diagonal well is located in the minerals on the west side of the rock pipe. The inclination angle is 25 °, the depth depth is 312 meters, and the length is 728 meters. Essence Mining uses a bottomless column to collapse, with a stage height of 50 meters and a segment height of 10 meters. Beginning underground mining projects in December 1999, in September 2002, the main oblique well reached 170 meters ( 90 meters high) working surface to form a production capacity and officially released the mine.
The protection of 20 meters thick at the bottom of the open-air pits, and the actual depth of the underground mining section is 170 meters (elevation 130 meters to -40 meters). According to the height of the mine section, the mining is divided into four stages of operation, and the height of each stage is 50 meters; one stage is divided into 5 sections, each section height is 10 meters, and the height of the small section is 5 meters. At each stage, engineering diamonds are used for mining and exploration to expose the boundaries of the mine, identify the area of the mineral section, understand the geological and hydrogeological conditions of mining engineering, and then rationally arrange the mining and mining areas from top to bottom. By the end of 2010, it was collected to 200 meters ( 60 meters high). The ore reserves were used in the underground mining stage ×× thousands of tons, and diamond reserves were used × × 万万地. Due to the increase in tail size in the later period, the mining and recycling diamonds were 587,500 carats, and the reserve utilization rate was 61.61%.
In open -air mining from 1975, to the 60 meter standard height at the end of 2010, the cumulative ore reserves of the "Victory I" rock pipes were used ××× thousand tons, and diamond reserves ××× Wankra. Among them, the amount of ore was 1759.6,000 tons, and Vajra was 206.21 million carats; the amount of losses lost 228.9,000 tons, and diamonds were 466,200 carats. The actual mining recovery rate of the mine was 88.49%, the cumulative mining recycling diamond was 1.6477 million carats, the mineral recovery rate was 80%, and the utilization rate of diamonds was 69.06%(Table 3-27).
Table 3-27 "Victory No. Ⅰ" Mine mining statistics statistics table
3.5.5 "Victory No. Ⅰ" rock pipe selection work
(1) Mining process
The physical properties of rocks and diamonds, refer to and absorb the mineral selection plan during the exploration of the mine, the mining process of the "Victory No. Ⅰ" rock pipe adopts the mineral selection process of multiple sections of crushing, staged stages, fine crushing and abrasive reinforcement. , Jumping, shaking, oil selection, light selection, light selection, mirror selection and other methods to extract diamond stone to help protect large granules diamonds, increase diamond recovery rate, and reduce the crushing rate.
(2) Elected granularity of the ore
Ben according to the production process of the ore for many years, the granularity limit of the ore selection is 25 mm, and the tail particle size is u003C0.2 mm. The granularity of the raw ore for the supply is 300 mm, the crushing ratio of thickness is 300/80 = 3.75, and the moderate crushing ratio is 80/25 = 3.2. Basically, three-stage crushing, two-stage grinding ore, and three-stage selection, two options cycle processes (Figure 3-46).
Figure 3-46 Victory Ⅰ Vajrayana mineral selection process flow
The original mine uses three sections of crushing: manual crushing, 200 ~ 300 mm for mines, ore ore u003C120 mm; second segment of crushing, giving mines u003C120 Millimeters, ore ore u003C40 mm; three sections of crushing, giving ore u003C40 mm, excrement u003C16 mm.
The jump: 16 mm for ore, excrement u003C8mm.
The light selection (-16 8 mm): Give ore u003C16 mm, ore ore u003C88 mm; (-8 4 mm) 200 × 75 mm.
The roller: giving ore u003C8mm, ore ore u003C4mm.
Maning: The abrasive ore is the tailing of the tailings at all levels, with the amount of grain of the mineral size -4 2 mm, -2 0.5 mm; Getting granularity -4 0.5 mm.
Band mill: Give ore as two-stage grinding ore, excrete -0.2 mm.
S selective milling, using cylindrical roller grinding, the purpose is to grind the pulse stone selected by the granular floats into mud.
This jumping, shaking beds: According to the different proportion of minerals, dynamic sorting: jumping points -16 4, -8 4, -4 2, -2 0.5, 0.5-0.2 mm grade level , Shake the bed divided by -1 0.5, 0.5-0.2 mm, etc.
It oil selection, granular floating: Using the liquidity and hydrophobic characteristics of diamonds, the -4 2, -2 0.2 mm dynamic sort is used.
The light selection: use the fluorescentity of diamond to perform X-ray dynamic splits. The selected granularity is -8 4, -4 2, -2 1, -1 0.2 mm, etc.
(3) The selection of ore ore
This "Victory No. Ⅰ" rock pipe ore is generally high, generally 752 ~ 838 mg/cubic meter. The selection of ore is selected for a variety of types of ore comprehensive quality, which is much higher than the minimum industrial quality selected by the mining area 30 mg/cubic meter.
(4) Vajrayana ore quality
"Victory No. Ⅰ" mining plant has experienced nearly 40 years of exploration improvement since it was officially put into production in 1972. The recovery rate of diamonds has increased from 44%at the beginning of the initial construction to 77.8%. In recent years, it has basically stabilized at about 80%; diamond mechanical crushing has also been reduced from 30%to 40%of the original 193 mg/cubic meters dropped to about 162 mg/cubic meter.
In 40 years of mineral production, especially since 2003, the grinding processes in the mining process have been adjusted and improved multiple times, which has greatly improved the yield of diamond ore. In recent years, due to the shortage of diamond raw materials at home and abroad, the continuous expansion of the use of diamonds and the improvement of diamond processing technology, the division of diamond industrial grades has also become more detailed, so that resources can be fully used. According to the current commercial standards, the industrial grade produced by the "Victory Ⅰ" rock pipeline has greatly improved compared with geological exploration reports, especially the broken grain diamonds from the original 80%to about 35%, the corresponding decorations The level has increased from 0.2%to 11%, and the industrial level has also increased from 15%to 45%(Table 3-28), which has greatly improved the economic benefits of the mining.
The Table 3-28 "Victory No. Ⅰ" diamond product industrial grade division (%)
from the "Victory No. Ⅰ" rock pipe input to 2010, a total of 1759.6,000 tons of ore is adopted, a total of choice Getting 1647713 carats, 9%to 11%of which are decorative grade, 45%~ 55%are industrial grade, and about 35%are crushed grain. The larger particles of diamonds and higher-grade diamonds have been improved before. A total of more than 100 carat diamonds were selected, and 5 of the Mont-Mountain Series Dagang Stone (Table 3-29, Figure 3-47).
The Table 3-29 "Victory No. Ⅰ" rock pipe selected Da diamond statistical table
Figure 3-47 diamond
in view of the existing diamond The mines and grinding materials of the mineral selection process are not complete, which can easily cause diamond people to crush, so that the crushing rate of the medium -sized products in the finished product is high, and it is maintained at about 21%to 28%year -round. Small particles, small particles have become u003C0.2 mm and lost, and large granular diamond production rates and less high -grade diamond content appear. According to production statistics in recent years, the annual output rate of more than 10 carats of diamonds is only 5 to 7, and diamonds greater than 5 mm accounted for 5.74%, while diamonds less than 3 mm accounted for 78.44%(Table 3-30), and diamonds were broken. The rate is as high as about 35%, which greatly reduces the grade of diamonds. Since 2003, the amount of mining tail decline has increased from 0.2 mm to 3 mm. Although the energy consumption of the minerals has been reduced and the large diamond production rate has been increased, it has reduced the recycling rate of diamond ore, and the actual recycling of diamonds accounted for only 21.56 of the original mineral quality. %, Nearly 80%of diamonds were lost, which seriously affected the output and economic benefits of diamonds, causing waste of resources. This is not known as the current situation of my country's current diamond resources, and the shortage of ore ore. In the future, we will also need to improve the mineral selection process and improve diamond recycling utilization.
Table 3-30 2003 "Victory No. Ⅰ" selected to obtain diamond granularity statistics table
3.5.6 Vajrayana production economic benefits
(1) Vajrayana production capacity
building materials "701 Mine "is currently the largest modern diamond mine in my country. It designed 86.5,000 tons of ore annual treatment and 100,000 carats in annual output of diamonds. Due to the incomplete mineral selection process, the secondary crushing rate of diamonds has been high. Since the production, it has not been able to operate at full load. It has limited production capacity for a long time and studied and improved. From 1975 to 1980, the output was high, reaching 6.52 to 70,100 carats, and the annual output was controlled at about 50,000 carats since then. After entering underground mining, the output is generally maintained at 35,000 carats. From 1972 to 2010, a total of 1759.6,000 tons of ore was collected, and 1.647 million carats were selected, with an average annual output of 433 million carats.
(2) The cost of production of diamonds
With the changes in the production conditions of diamonds and the improvement of mineral selection skills, the production cost of building materials "701" diamonds has gradually decreased. During the open -air mining phase, the mineral selection process is in the experimental running -in period. The operators have a sparse skill and a low production management rate. As a result, the production cost is higher. From 1978 to 1980, it was 116.37 ~ 127.72 yuan/carat. Then gradually adjusted the mineral selection process, improved production organizations, and saved energy and dug. By 1990 to 2003, except for more than 10 carat diamonds, the production cost of general diamond units dropped to 95 ~ 100 yuan/carat. After 2003, the granularity of diamonds was adjusted to 3 mm, which further reduced the cost. Now the production cost of diamond units is about 80 yuan.
(3) Sales of diamond
With the refinement of domestic diamond use, especially the shortage of high -grade diamonds, the diamond -grade division standard has greatly improved and more practical. More than 60%of diamonds produced by the building materials "701" are colorless and transparent "pure drills", which has great market benefits. Except for a few more than 10 carat diamonds, most of the other are exported to Belgium, India, the United States, and Hong Kong, China. The average sales price of general industrial and broken diamonds is 400 ~ 500 yuan/carat. 15%~ 20%of diamonds selling jewelry dealers in Guangzhou, Shanghai and other places, mainly used to process jewelry and diamond tools. In 2007, the mine was established "Mengyin Diamond Co., Ltd.", and it was produced by about 200 carat diamond rings for about 200 carat diamonds each year.
(4) Mining assets and related industries
The building materials "701" has gone through the difficulty of twists and turns since 1966. In the early days of mining, due to the lack of production and management experience, the economic benefits were not high, and he could not run at full load. In December 1972, the construction committee of Linyi District, Shandong Province was decentralized. It was in a low -level production state for a long time. In May 1985, diamond products were changed from national packaging to self -production, and the annual output dropped by about 30,000 carats. Due to the continuation of the old mineral procurement process, the crushing rate of diamonds has been hovering at a high level. The quality of the product is not high, lacking competitiveness, and lack of vitality in mines. In September 1988, with the approval of the Linyi Bank, the name "701 Mine" was restored. In 1993, Ludo has reached the limit, and it is necessary to transfer to underground mining urgently. After many efforts, the mines have been transferred from the Linyi Office to the China Non -Metal Mining Industry (Group) Corporation. In February 1994, the VVS1 Co., Ltd. registered with Canadian CDC in Hong Kong signed a cooperation contract, introduced US $ 3.5 million in foreign capital, and established "Mengyin Dai Meng Kong Stone Co., Ltd.". In December 1999, an open -air underground project was started, and in July 2001, it was transferred to underground mining. After nearly forty years of mining, the work surface has reached more than 200 meters, resource reserves have decreased, and the difficulty of mining has increased. Various equipment has been seriously aging, urgently needs to be updated, and the mines are undergoing increasing pressure.
The first phase of Building Materials 701 Starting from 1966, until September 1980's mining "Red Flag 1" rock pipeline, the total investment was 9.675 million yuan. The second phase of the project began to prepare in January 1972, and was officially put into production in February 1975. It mined the "Victory No. Ⅰ" rock pipe, with a total investment of 28.282 million yuan. At present, the mine covers an area of 1763 acres, the construction area is 188,000 square meters, the fixed assets are 65.39 million yuan, and the company's net assets are 62.39 million yuan. There are 188 employees in the enterprise, of which 26 engineering and technical staff are the only diamond mines in China, and the largest contribution rate of diamonds in my country. Over the past 40 years, a total of 1.64 million carats have been produced, and some of them have eased the serious lack of diamonds in my country.
Figure 3-48 "Victory No. Ⅰ" rock pipe mining status diagram
"Victory No. Ⅰ" rock pipe via the seventh geological exploration of the seventh geological team of the Shandong Provincial Geological Mineral Bureau. The monthly submission of more than 600 meters ( 260 ~ -340 meters) of the mine section diamond resource reserves ××× Wanwra. By 2010, the open -air mining and underground mining of the 701 Mine for nearly 40 years had been reached 200 meters. The cumulative reserves were used ××× Wanwra. At this point, the golden period of rock pipe development has passed, and the lower part of the rock pipe root is now entered. The section area is narrowing, the ore taste is declining, the degree of geological exploration is decreasing, and the deep understanding of the deep shape of the rock pipe and the level of ore grade. At present, underground operations are becoming increasingly difficult, and it is facing the situation where the ore is not enough, the mining plant is insufficient, and the decline in economic benefits is urgently needed to supplement the new resources (Figure 3-48).
In 2007, the 701 Mining joint venture established Mengshan Diamond Co., Ltd. to carry out diamond product marketing and processing, production of diamond tools, decorations, etc., and the annual turnover has gradually increased, becoming a new growth point for the mining economy. From the past, from the past, A single mine mining model has developed into a new type of enterprise integrating mining development, design and processing, and brand marketing, so as to make the 701 Mine-Mine Vales Development and operation stone move towards a brand-oriented, large-scale, and social road (Figure 3-49) Essence
In 2005, relying on the mines for open -air mining sites to build a national mining park -Shandong Yimeng Diamond National Mining Park. This is my country's first and only mining park in Shandong Province. The theme of the park is "popularizing geological science, governing the environment of the mine, protecting and using mining", with the goal of "promoting diamond culture, creating boutique tourism, and driving related industries", and the AAAAA -level tourist scenic spot. The total area of the park is about 30 square kilometers. A total of ten areas such as domestic and foreign diamond perspective, diamond exhibition, pit exploration, diamond processing exhibition, leisure and vacation, and 56 attractions. By 2008, the first phase of the project's investment in the pits of 160 million yuan was planned, and the construction of the Diamond Museum and the main venue of the park had been basically completed, and it began to start with surgery and tourism services (Figure 3-50).
The active and orderly operation of the various parts of the mine. The entire mining employees are carrying out the deep inspection of rock pipelines to search for mines, expand diamond resource reserves, adjust production organizations, improve the mineral selection process, improve operational skills, carry out diamonds processing, and strive to strive to strive to strive Realize the new development goals of mining companies.
Figure 3-49 Mengshan Diamond Co., Ltd. some diamonds
Figure 3-50 Shandong Yimeng Diamond National Mining Park

1 thought on “"Victory No. Ⅰ" rock pipe mining”

Cedric
September 11, 2022 at 4:48 am

3.5.1 The mining of the "Red Flag 1" rock pipe and the mining preparation of the "Victory I" rock pipeline n The country attaches great importance to the discovery of my country's first diamond ore- "Red Flag 1". On August 15, 1966, the Ministry of Building Materials and Geological Department jointly issued a notice. At that time, the building materials 803 ore developed by the Daocheng King Kong Sand Mine at the time established the Mengyin Mining Area to build a construction office, which is responsible for the construction of the "Red Flag 1" mining area. On July 17, 1967, the Ministry of Building Materials decided to rename the "Mongolian Yin Yin Mining Area Preparation Office" of the 803 Mining Mining Mine to "Building Materials 701 Mine Preparation Office", adopting the policy of "side exploration, side design, and construction" to start the first phase Engineering construction, mining "Red Flag 1" mineral. In January 1968, the ground was broken, and it was completed and put into operation in December 1970. It designed and produced 86,500 tons of ore annually and recovered 20,000 carats of diamonds. Mine mining is 40 meters and 80 meters. It adopts a central vertical diagonal ventilation scheme and adopts mining mining method of downstream collapse. The mineral selection plant is located in the Mengyin Songjiazhuang Xishan, which is 14 kilometers away from the mining area. The mineral selection process adopts the solution of gravity minerals, multi -band crushing, first selection and then break, closed circular circulation, and classification selection. The mineral water source is located in the Dongwen River.
In more than three years of common exploration, the "Red Flag 1" circle has a length of 1450 meters, the drilling control depth of about 200 meters, and a local area of 300 meters. Exploring Vajrayana industrial reserves × × Wan -carat, of which B -level × Wankera, C1 level × Wankra, C2 level × Wanchra, submitted an exploration report in 1969. At the same time, the mining of "Red Flag 1" has progressed rapidly. Since the production, it has been explained, mining, and gradually improving the production process. In the middle of 40 meters, the middle section of 80 meters was transferred in 1976. The mining length was 800 meters and 1100 meters, respectively. By September 1980, the cumulative mining for 10 years, a total of reserves × Wankra, accounting for 43.3%of the total mineral reserves, the ore utilization rate is about 76.5%, diamond recovery rate is about 54.5%. Broken grain, low industrial quality. The reserves of more than 180 meters in the middle of the mine have been emptied, and the deep reserves of the depth of the ore body and the middle section of only the remaining ore body.
During the mining process of "Red Flag 1", in September 1969, the "Victory No. Ⅰ" rock pipe with richer reserves, higher quality, and better quality of diamonds was discovered. The state decided to go to Malaysia's second phase of the Malaysians. While mining "Red Flag 1", it was prepared to minimize the "Victory I" rock pipe. In view of the first phase of mining projects based on the construction of "Red Flag 1", it can no longer meet the mining needs of "Victory No. Ⅰ". Mining plant, annual treatment of 96,100 tons of ore, produced 100,000 carats of diamonds. Water source is located in Shuigou, Pingyi County. In December 1975, the ground engineering construction and dewcai preparations were preparations. In May 1980, the "Victory I" was officially mining, and the mining of "Red Flag 1" stopped. In view of the domestic mining experience of diamonds in China, the second phase of the project has also built the selection of 20,000 carat -free medium mixed self -abrasive ore test factories an annual output of diamonds, and conducted a comparison of each other to obtain the best mineral selection process. In the initial stage of "Victory I", due to the initial operation of the new equipment, the operating skills were sparse, and the crushing rate of diamonds reached 80%, the recovery rate of diamonds was less than 50%, and the resources were seriously waste. The mine has been used in time to restrict production and research procurement. Although it has improved, the results are not great.
3.5.2 The technical conditions of the "Victory I" rock pipe mining
(1) Hydrogeological conditions
"Victory No. Ⅰ" rock pipe area is the hilly terrain, and most of the rocks are exposed, only The bottom of the groove valley on the north side of the rock pipe is covered with gravel layer and clay layer, with a thickness of 1 ~ 10 meters, and a small amount of shallow pore water. Kimberley rock and surrounding granite rocks, the fissure development of the fracture, the upper weathering layer is filled by mud or kaolin quality, the water permeability is poor, and the cracks are not much. Mine mining is affected by natural precipitation. The open -air pits are water collecting funnels that accept natural precipitation, which constitutes harm to open -air mining operations. It can also penetrate deep through the original and explosive cracks through rocks, becoming the main object of prevention of underground mining. In addition, there are more than a hundred drilling holes during the exploration of the mining area, and the quality of the holes is not high. It is possible to communicate various cracks to form local water storage space and cause short -term local aphrodisiac.
The dynamic changes in surface water around the mining area Dynamic changes are controlled by the season. The supply source comes from the atmospheric precipitation. The excretion is affected by the terrain and flows out of the north east. The maximum daily flow of the small river in the north side of the rock pipeline was 9272.34 cubic meters, which lasted about 8 hours, and then gradually decreased.
The daily water volume during the open -air mining changes at 183 ~ 274 cubic meters, and the groundwater penetration coefficient is 0.074 meters per day.
The characteristics of the above characteristics, hydrogeological conditions in this area are simple.
(2) Engineering geological conditions
The rock type in the mining area is relatively simple. The type of ore is mainly spotted Jinbelie and Jinbielie Clamp, spots structure, corner gravel or block structure, hardness of 5 ~ 6 There are not many cracks. The minerals of the mines are all rough lithite flashes long rocks in the late ancient sheet, and the rocks are uniform, and the rock hardness is 6 ~ 7. Small breaks can be seen in the east and south of the rock pipe, and the fault structure is relatively close. In part of the parts and southern parts of the north -south edge of the tube, the rock nature is relatively broken, it is prone to collapse, and there are hidden safety hazards. The geological conditions of mining engineering engineering are medium and simple.
(3) Environmental geological conditions
The mining area is located in the high incidence of the high incidence area of the eastern earthquake -the west side of the Yimao Fracture Belt. The north and south sides of the mining area include Mengshan and Xintai-Duozhuang to a broken belt. The two neighbor and new generation structure and magma activities in the east and west neighbors of the mining area are active. In 1668, the Great Earthquake of the Tancheng was affected by it and had a strong sense of earthquake. Previously, Mengyin had not experienced a sense of earthquakes since the record. The mining area is more than 0.2 kilometers from the residential land, and there is no large -area vegetation and farmland. Mining will not cause significant damage to the surrounding natural environment. Mining plants and living areas are mainly built in hillside areas outside the rock pipes. The mining process does not produce toxic, pollution and other substances, and it will not cause harm to the environment. The annual scrap stone of the mine and the mining tail sand is about 5720 cubic meters, which are mainly discharged in the southwest of the minerals. The environmental conditions of "Victory I" are relatively simple.
3.5.3 ore processing technical performance
(1) The physical properties of the ore
ore are various types of Kimbeli Rock, of which 50%of the spotted Jinbieli rocks, about 40%of Kimberley Classes, about 40%, and about 40%, and about 40%, Kimbeli rocky cornea is about 10%. The main composition of the ore contains snake pattern, Jinyun mother, long stone, quartz, etc., all of which are light minerals with a proportion of less than 2.6. The proportion of diamonds is large, and the total content of less rocks is 3%. Kimberley's wind has a wind of about 5 meters, and the color of the deep ore has changed from yellow -green to dark green. The surface or shallow ore is loose, the depth is complete, and the cracks are less. The hardness of the ore is 5.5 ~ 6. It is easily broken by blows or friction, and it is more convenient to process. > 16 mm original ore particle size> 90%. The ore loosening coefficient is 1.53 ~ 1.96, and the average proportion of ore is 2.53.
Ated rocks of minerals are long -term lithite long rocks in late Tai ancient quartz, with numb structures, and medium coarse -grained structures; rock hardness of 6 ~ 7, fissure development; Eclipse is broken, soil is severe, and it is easy to collapse.
(2) The physical properties of diamonds
Tracks of diamonds have some unique physical properties, which can be separated from Jinbelie Rock. The proportion of diamonds is 3.5, and there is a large proportion difference from the goldbelie rock mineral or fenced rock minerals (proportion of 2.5 ~ 2.7), which can be separated by gravity sorting; diamond surface has good hydrophobicity and oil. The method of floating is selected; diamonds have fluorescent light, and they often occur under the X -ray. It is often different from the purple scattered fluorescent light of the phosphorus, vermiculite, and square lipstick. Vajrayana is extremely hard and up to 10 levels. It can withstand great static pressure, but the impact is limited. It can be used by hard -to -juvenile grinds. It is not suitable to strike gravity. In particular, large granules often have native cracks and are prone to crushing after being hit.
The diamond granularity in Jinbieliyan is very different, from> 16 mm to u003C0.5 mm, large, small, larger, the larger the particles, the higher the value, often there are native cracks, which are prone to crushing. Therefore The complete protection of large grain diamond is the priority requirement of the mineral selection. It should be selected by the method of chopping, then crushing, and classification.
3.5.4 "Victory No. Ⅰ" rock pipe mining plan
(1) The scope of the mining area
"Victory No. Ⅰ" rock pipe administrative area belongs to Wangcun, Mengyin County, Mengyin County. The rock pipe is around the hilly area, with a ground elevation of 240 to 288 meters. The southern terrain is high, and the base rocks are exposed. The north is gradually lowered.
The building materials "701" was first established in August 1966. The mining rights were established in 1987. After several changes and continuity, the mining right certificate issued by the Ministry of Land and Resources is now held. The mining area is determined by 11 inflection points, with an area of 0.0895 square kilometers, and the mining depth is from 260 meters to -40 meters (Figure 3-44).
Figure 3-44 "Victory No. Ⅰ" rock pipe mining right range diagram
Figure 3-45 "Victory No. Ⅰ" rock pipe open pit
(2) open-air mining n Since the discovery of "Victory I" rock pipes since September 1969, after 4 years of exploration, a geological exploration report was submitted in December 1972. The ore section of the vertical depth of 600 meters is submitted to the diamond industrial reserves and vision reserves ×× × Wan carat.
In the end of the mine exploration, that is, start to prepare for the "Victory No. Ⅰ" mining project. According to the development plan compiled by the Suzhou Branch of the Non-Metal Mine Design Institute of the Ministry of Building Materials, an open-air mining of the mine section of the rock pipeline is more than 100 meters (Figure 3-45). There are seven steps on the slope of the pits, the width of the countertop is 3 meters, the step slope is 75 °, and the width of the transportation platform is 6 meters. The upper part of the pits is 5 ~ 10 meters high, the lower part of 70 meters is 15 meters high, the final slope angle is 45 °, and the peeling ratio of the open -air pits is 6.0. Ten meters of impact drilling rock blasting, 1 cubic meter of tok -mounted rock, 10 tons of spiral lines in the pits of 10 tons. Starting in December 1972, cleaning the mining site, renovating the pile venue, building a mining plant, and debugging the equipment. In November 1975, the fence began to peel off the feed rocks and some mining of ore. In May 1980, it was officially explained in the open -air. The ore is directly sent to the west side of the rock pipe to enter the crushed process, and the surrounding rock is sent to the southeast of the rock pipeline. After about 14 years of excavation, a funnel -shaped open -air pits formed a funnel -shaped pits of 330 meters long, 230 meters wide from north to south, and 100 meters deep. In 1992, the mines were delayed by 10 meters in accordance with the mining mining conditions, reaching 110 meters deep (elevation 150 meters), and reached the limits of Luxie in 1993. During the open -air mining period, a total of ore reserves were used ××× 10,000 tons, diamond reserves ××× per thousand -carats, and 1.062 million carats of diamonds were selected, and the reserves utilization rate was 74.16%.
(3) Underground mining
After exploiting to the limit, underground mining projects failed to immediately start underground mining projects for various reasons. After many turns, it was not until the establishment of "Mengyin Dai Mengang Stone Co., Ltd." in cooperation with the Canadian CDC company to introduce foreign capital, and it began to prepare for underground mining in February 1994.
The mining feasibility study report below the rock pipe 150 meters below the mine section was compiled in December 1993 by the Chinese Architectural Materials Industry Planning Institute. Mengyin Dai Mengang Stone Co., Ltd. "The preliminary design of the open-air underground project, the design and mining depth of 190 meters ( 150 ~ 40 meters). The mine section has ore × ××× 10,000 tons, diamond reserves ××× 10,000 carats, and the average ore grade is 661.95 mg/cubic meter. The diagonal expansion is used, and the main shafts are oblique wells. The main diagonal well is located in the minerals on the west side of the rock pipe. The inclination angle is 25 °, the depth depth is 312 meters, and the length is 728 meters. Essence Mining uses a bottomless column to collapse, with a stage height of 50 meters and a segment height of 10 meters. Beginning underground mining projects in December 1999, in September 2002, the main oblique well reached 170 meters ( 90 meters high) working surface to form a production capacity and officially released the mine.
The protection of 20 meters thick at the bottom of the open-air pits, and the actual depth of the underground mining section is 170 meters (elevation 130 meters to -40 meters). According to the height of the mine section, the mining is divided into four stages of operation, and the height of each stage is 50 meters; one stage is divided into 5 sections, each section height is 10 meters, and the height of the small section is 5 meters. At each stage, engineering diamonds are used for mining and exploration to expose the boundaries of the mine, identify the area of the mineral section, understand the geological and hydrogeological conditions of mining engineering, and then rationally arrange the mining and mining areas from top to bottom. By the end of 2010, it was collected to 200 meters ( 60 meters high). The ore reserves were used in the underground mining stage ×× thousands of tons, and diamond reserves were used × × 万万地. Due to the increase in tail size in the later period, the mining and recycling diamonds were 587,500 carats, and the reserve utilization rate was 61.61%.
In open -air mining from 1975, to the 60 meter standard height at the end of 2010, the cumulative ore reserves of the "Victory I" rock pipes were used ××× thousand tons, and diamond reserves ××× Wankra. Among them, the amount of ore was 1759.6,000 tons, and Vajra was 206.21 million carats; the amount of losses lost 228.9,000 tons, and diamonds were 466,200 carats. The actual mining recovery rate of the mine was 88.49%, the cumulative mining recycling diamond was 1.6477 million carats, the mineral recovery rate was 80%, and the utilization rate of diamonds was 69.06%(Table 3-27).
Table 3-27 "Victory No. Ⅰ" Mine mining statistics statistics table
3.5.5 "Victory No. Ⅰ" rock pipe selection work
(1) Mining process
The physical properties of rocks and diamonds, refer to and absorb the mineral selection plan during the exploration of the mine, the mining process of the "Victory No. Ⅰ" rock pipe adopts the mineral selection process of multiple sections of crushing, staged stages, fine crushing and abrasive reinforcement. , Jumping, shaking, oil selection, light selection, light selection, mirror selection and other methods to extract diamond stone to help protect large granules diamonds, increase diamond recovery rate, and reduce the crushing rate.
(2) Elected granularity of the ore
Ben according to the production process of the ore for many years, the granularity limit of the ore selection is 25 mm, and the tail particle size is u003C0.2 mm. The granularity of the raw ore for the supply is 300 mm, the crushing ratio of thickness is 300/80 = 3.75, and the moderate crushing ratio is 80/25 = 3.2. Basically, three-stage crushing, two-stage grinding ore, and three-stage selection, two options cycle processes (Figure 3-46).
Figure 3-46 Victory Ⅰ Vajrayana mineral selection process flow
The original mine uses three sections of crushing: manual crushing, 200 ~ 300 mm for mines, ore ore u003C120 mm; second segment of crushing, giving mines u003C120 Millimeters, ore ore u003C40 mm; three sections of crushing, giving ore u003C40 mm, excrement u003C16 mm.
The jump: 16 mm for ore, excrement u003C8mm.
The light selection (-16 8 mm): Give ore u003C16 mm, ore ore u003C88 mm; (-8 4 mm) 200 × 75 mm.
The roller: giving ore u003C8mm, ore ore u003C4mm.
Maning: The abrasive ore is the tailing of the tailings at all levels, with the amount of grain of the mineral size -4 2 mm, -2 0.5 mm; Getting granularity -4 0.5 mm.
Band mill: Give ore as two-stage grinding ore, excrete -0.2 mm.
S selective milling, using cylindrical roller grinding, the purpose is to grind the pulse stone selected by the granular floats into mud.
This jumping, shaking beds: According to the different proportion of minerals, dynamic sorting: jumping points -16 4, -8 4, -4 2, -2 0.5, 0.5-0.2 mm grade level , Shake the bed divided by -1 0.5, 0.5-0.2 mm, etc.
It oil selection, granular floating: Using the liquidity and hydrophobic characteristics of diamonds, the -4 2, -2 0.2 mm dynamic sort is used.
The light selection: use the fluorescentity of diamond to perform X-ray dynamic splits. The selected granularity is -8 4, -4 2, -2 1, -1 0.2 mm, etc.
(3) The selection of ore ore
This "Victory No. Ⅰ" rock pipe ore is generally high, generally 752 ~ 838 mg/cubic meter. The selection of ore is selected for a variety of types of ore comprehensive quality, which is much higher than the minimum industrial quality selected by the mining area 30 mg/cubic meter.
(4) Vajrayana ore quality
"Victory No. Ⅰ" mining plant has experienced nearly 40 years of exploration improvement since it was officially put into production in 1972. The recovery rate of diamonds has increased from 44%at the beginning of the initial construction to 77.8%. In recent years, it has basically stabilized at about 80%; diamond mechanical crushing has also been reduced from 30%to 40%of the original 193 mg/cubic meters dropped to about 162 mg/cubic meter.
In 40 years of mineral production, especially since 2003, the grinding processes in the mining process have been adjusted and improved multiple times, which has greatly improved the yield of diamond ore. In recent years, due to the shortage of diamond raw materials at home and abroad, the continuous expansion of the use of diamonds and the improvement of diamond processing technology, the division of diamond industrial grades has also become more detailed, so that resources can be fully used. According to the current commercial standards, the industrial grade produced by the "Victory Ⅰ" rock pipeline has greatly improved compared with geological exploration reports, especially the broken grain diamonds from the original 80%to about 35%, the corresponding decorations The level has increased from 0.2%to 11%, and the industrial level has also increased from 15%to 45%(Table 3-28), which has greatly improved the economic benefits of the mining.
The Table 3-28 "Victory No. Ⅰ" diamond product industrial grade division (%)
from the "Victory No. Ⅰ" rock pipe input to 2010, a total of 1759.6,000 tons of ore is adopted, a total of choice Getting 1647713 carats, 9%to 11%of which are decorative grade, 45%~ 55%are industrial grade, and about 35%are crushed grain. The larger particles of diamonds and higher-grade diamonds have been improved before. A total of more than 100 carat diamonds were selected, and 5 of the Mont-Mountain Series Dagang Stone (Table 3-29, Figure 3-47).
The Table 3-29 "Victory No. Ⅰ" rock pipe selected Da diamond statistical table
Figure 3-47 diamond
in view of the existing diamond The mines and grinding materials of the mineral selection process are not complete, which can easily cause diamond people to crush, so that the crushing rate of the medium -sized products in the finished product is high, and it is maintained at about 21%to 28%year -round. Small particles, small particles have become u003C0.2 mm and lost, and large granular diamond production rates and less high -grade diamond content appear. According to production statistics in recent years, the annual output rate of more than 10 carats of diamonds is only 5 to 7, and diamonds greater than 5 mm accounted for 5.74%, while diamonds less than 3 mm accounted for 78.44%(Table 3-30), and diamonds were broken. The rate is as high as about 35%, which greatly reduces the grade of diamonds. Since 2003, the amount of mining tail decline has increased from 0.2 mm to 3 mm. Although the energy consumption of the minerals has been reduced and the large diamond production rate has been increased, it has reduced the recycling rate of diamond ore, and the actual recycling of diamonds accounted for only 21.56 of the original mineral quality. %, Nearly 80%of diamonds were lost, which seriously affected the output and economic benefits of diamonds, causing waste of resources. This is not known as the current situation of my country's current diamond resources, and the shortage of ore ore. In the future, we will also need to improve the mineral selection process and improve diamond recycling utilization.
Table 3-30 2003 "Victory No. Ⅰ" selected to obtain diamond granularity statistics table
3.5.6 Vajrayana production economic benefits
(1) Vajrayana production capacity
building materials "701 Mine "is currently the largest modern diamond mine in my country. It designed 86.5,000 tons of ore annual treatment and 100,000 carats in annual output of diamonds. Due to the incomplete mineral selection process, the secondary crushing rate of diamonds has been high. Since the production, it has not been able to operate at full load. It has limited production capacity for a long time and studied and improved. From 1975 to 1980, the output was high, reaching 6.52 to 70,100 carats, and the annual output was controlled at about 50,000 carats since then. After entering underground mining, the output is generally maintained at 35,000 carats. From 1972 to 2010, a total of 1759.6,000 tons of ore was collected, and 1.647 million carats were selected, with an average annual output of 433 million carats.
(2) The cost of production of diamonds
With the changes in the production conditions of diamonds and the improvement of mineral selection skills, the production cost of building materials "701" diamonds has gradually decreased. During the open -air mining phase, the mineral selection process is in the experimental running -in period. The operators have a sparse skill and a low production management rate. As a result, the production cost is higher. From 1978 to 1980, it was 116.37 ~ 127.72 yuan/carat. Then gradually adjusted the mineral selection process, improved production organizations, and saved energy and dug. By 1990 to 2003, except for more than 10 carat diamonds, the production cost of general diamond units dropped to 95 ~ 100 yuan/carat. After 2003, the granularity of diamonds was adjusted to 3 mm, which further reduced the cost. Now the production cost of diamond units is about 80 yuan.
(3) Sales of diamond
With the refinement of domestic diamond use, especially the shortage of high -grade diamonds, the diamond -grade division standard has greatly improved and more practical. More than 60%of diamonds produced by the building materials "701" are colorless and transparent "pure drills", which has great market benefits. Except for a few more than 10 carat diamonds, most of the other are exported to Belgium, India, the United States, and Hong Kong, China. The average sales price of general industrial and broken diamonds is 400 ~ 500 yuan/carat. 15%~ 20%of diamonds selling jewelry dealers in Guangzhou, Shanghai and other places, mainly used to process jewelry and diamond tools. In 2007, the mine was established "Mengyin Diamond Co., Ltd.", and it was produced by about 200 carat diamond rings for about 200 carat diamonds each year.
(4) Mining assets and related industries
The building materials "701" has gone through the difficulty of twists and turns since 1966. In the early days of mining, due to the lack of production and management experience, the economic benefits were not high, and he could not run at full load. In December 1972, the construction committee of Linyi District, Shandong Province was decentralized. It was in a low -level production state for a long time. In May 1985, diamond products were changed from national packaging to self -production, and the annual output dropped by about 30,000 carats. Due to the continuation of the old mineral procurement process, the crushing rate of diamonds has been hovering at a high level. The quality of the product is not high, lacking competitiveness, and lack of vitality in mines. In September 1988, with the approval of the Linyi Bank, the name "701 Mine" was restored. In 1993, Ludo has reached the limit, and it is necessary to transfer to underground mining urgently. After many efforts, the mines have been transferred from the Linyi Office to the China Non -Metal Mining Industry (Group) Corporation. In February 1994, the VVS1 Co., Ltd. registered with Canadian CDC in Hong Kong signed a cooperation contract, introduced US $ 3.5 million in foreign capital, and established "Mengyin Dai Meng Kong Stone Co., Ltd.". In December 1999, an open -air underground project was started, and in July 2001, it was transferred to underground mining. After nearly forty years of mining, the work surface has reached more than 200 meters, resource reserves have decreased, and the difficulty of mining has increased. Various equipment has been seriously aging, urgently needs to be updated, and the mines are undergoing increasing pressure.
The first phase of Building Materials 701 Starting from 1966, until September 1980's mining "Red Flag 1" rock pipeline, the total investment was 9.675 million yuan. The second phase of the project began to prepare in January 1972, and was officially put into production in February 1975. It mined the "Victory No. Ⅰ" rock pipe, with a total investment of 28.282 million yuan. At present, the mine covers an area of 1763 acres, the construction area is 188,000 square meters, the fixed assets are 65.39 million yuan, and the company's net assets are 62.39 million yuan. There are 188 employees in the enterprise, of which 26 engineering and technical staff are the only diamond mines in China, and the largest contribution rate of diamonds in my country. Over the past 40 years, a total of 1.64 million carats have been produced, and some of them have eased the serious lack of diamonds in my country.
Figure 3-48 "Victory No. Ⅰ" rock pipe mining status diagram
"Victory No. Ⅰ" rock pipe via the seventh geological exploration of the seventh geological team of the Shandong Provincial Geological Mineral Bureau. The monthly submission of more than 600 meters ( 260 ~ -340 meters) of the mine section diamond resource reserves ××× Wanwra. By 2010, the open -air mining and underground mining of the 701 Mine for nearly 40 years had been reached 200 meters. The cumulative reserves were used ××× Wanwra. At this point, the golden period of rock pipe development has passed, and the lower part of the rock pipe root is now entered. The section area is narrowing, the ore taste is declining, the degree of geological exploration is decreasing, and the deep understanding of the deep shape of the rock pipe and the level of ore grade. At present, underground operations are becoming increasingly difficult, and it is facing the situation where the ore is not enough, the mining plant is insufficient, and the decline in economic benefits is urgently needed to supplement the new resources (Figure 3-48).
In 2007, the 701 Mining joint venture established Mengshan Diamond Co., Ltd. to carry out diamond product marketing and processing, production of diamond tools, decorations, etc., and the annual turnover has gradually increased, becoming a new growth point for the mining economy. From the past, from the past, A single mine mining model has developed into a new type of enterprise integrating mining development, design and processing, and brand marketing, so as to make the 701 Mine-Mine Vales Development and operation stone move towards a brand-oriented, large-scale, and social road (Figure 3-49) Essence
In 2005, relying on the mines for open -air mining sites to build a national mining park -Shandong Yimeng Diamond National Mining Park. This is my country's first and only mining park in Shandong Province. The theme of the park is "popularizing geological science, governing the environment of the mine, protecting and using mining", with the goal of "promoting diamond culture, creating boutique tourism, and driving related industries", and the AAAAA -level tourist scenic spot. The total area of the park is about 30 square kilometers. A total of ten areas such as domestic and foreign diamond perspective, diamond exhibition, pit exploration, diamond processing exhibition, leisure and vacation, and 56 attractions. By 2008, the first phase of the project's investment in the pits of 160 million yuan was planned, and the construction of the Diamond Museum and the main venue of the park had been basically completed, and it began to start with surgery and tourism services (Figure 3-50).
The active and orderly operation of the various parts of the mine. The entire mining employees are carrying out the deep inspection of rock pipelines to search for mines, expand diamond resource reserves, adjust production organizations, improve the mineral selection process, improve operational skills, carry out diamonds processing, and strive to strive to strive to strive Realize the new development goals of mining companies.
Figure 3-49 Mengshan Diamond Co., Ltd. some diamonds
Figure 3-50 Shandong Yimeng Diamond National Mining Park

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