1 Basic overview of the project
A copper- gold polymetallic mine is located in the 270° direction of the county seat with a horizontal distance of 25km and good external traffic conditions. The mining area is a subtropical high archetype monsoon climate zone with a southerly wind direction, a wind speed of 0.5-2.5 m/s and an annual rainfall of 1600-2800 mm. The annual average temperature is 17~22°C, the lowest temperature is -3°C, and the highest temperature is 36°C.
2 Deposit characteristics
The mine includes seven copper, lead and gold industrial ore bodies.
V 1-1 ore body: 339-30°∠16-49°, the true thickness of the ore body is 0.75-5.40m, with an average of 2.25m. The ore body is a gold ore body; V 1-2 ore body: the shape is 240-20°∠59-74°, the true thickness of the ore body is 0.80-4.65m, and the average thickness is 2.29m. The ore body is a gold ore body; V 2-1a ore body: 152-215°∠45-72°, the true thickness of the ore body is 0.84-4.63m, and the average thickness is 2.04m; V 2-1b ore body: occurrence 252-335°∠69-80°, the true thickness of the ore body is 1.14-3.11m, the average thickness is 1.91m; V 2-1c ore body: 146-185∠46-71°, the true thickness of the ore body is 0.85-2.68m , the average thickness is 1.80m; V 4-1 ore body: the appearance of 61-22 ° ∠55-78 °, the true thickness of the ore body 0.75 - 6.14m, the average thickness of 2.28m; V 4-2 ore body: the appearance of 350 -11°∠53-84°, the true thickness of the ore body is 0.27—3.29m, with an average of 1.30m;
The V 1-1 ore body and the V 1-2 ore body are directly apex and porphyry, and the rock is hard and stable. It is a hard rock, its rock body has good weathering resistance and good stability, and it is generally not easy to produce bad engineering geological phenomena.
V 2-1a , V 2-1b , V 2-1c The direct top and bottom plates of the ore body are siliceous rocks and hard limestones. The siliceous rock sections have poor stability and good stability of limestone. It is a semi-hard to hard rock, its rock body has better weathering resistance and good stability, and it is generally not easy to produce bad engineering geological phenomena. The direct top and bottom plates of the V 4-1 ore body and the V 4-2 ore body are syenite porphyry and syenite. The rock structure is dense, hard and stable. It is a hard rock, its rock body has good weathering resistance and good stability, and it is generally not easy to produce bad engineering geological phenomena.
3 Resource development and utilization
3.1 Mining methods
According to the characteristics of the ore body, the corresponding mining technical conditions and the study of rock mechanics, the surrounding rock of the ore body is stable, the dip angle is 45°~84°, and the average thickness of the ore body is 1.30~2.29m. The shallow hole retention method and the section mining method were selected for comparison selection. For the rock mass of the ore body, the inclination angle is 16°~49°, and the gently inclined and inclined thin ore body with the average thickness of the ore body is 2.25m. The comprehensive method and the room-column method are selected for comparison.
Selection of mining method for inclined ~ steeply inclined thin ore body: The shallow hole retaining ore method and the section mining house method are selected for the inclined to steeply inclined thin ore body. The comparison is as follows:
By contrast, although the production capacity of the section mining method is larger than that of the shallow hole retention method, the method of the section mining method is shallower than the comparison of the ore loss rate, the ore depletion rate and the mining ratio. Hole retention method is poor.
Selection of mining methods for gently inclined ~ inclined thin ore bodies: For the moderately inclined and inclined thin ore bodies, the comprehensive method and the room-column method are selected for comparison. The comparison is as follows:
After comparison, although the production capacity of the room and column method is larger than that of the comprehensive method, the room-column method is worse than the comprehensive method in comparison with the ore loss rate, the ore depletion rate and the mining and cutting ratio.
3.2 Development System
The mining area is divided into three mining sections: A, B and C. According to the selected mining method, the ore body space shape and the current control of the ore body's deepening conditions, the underground mining A section is divided into the middle section of the west side of the V 4-2 ore body, 620, 570, 520m; V 4-1 ore body west The middle side of the mining area of ​​the V 4-2 ore body is 740, 690, 640, 590, 540, 490m; the middle section of the V 4-1 ore body is the middle section of 753, 703, 653, 603, 553m. The B section is divided into the middle section of the V 1-1 ore mining area of ​​1776, 1756 and 1736m; the V 1-2 ore body mining area is 1680 and 1626m of the middle section. The C section is divided into the middle section of the V 2-1 a ore body mining area 1568 and 1518m; the V 2-1 b, V 2-1 c mining area is the middle section of the 1540, 1490 and 1440m sections.
4 Conclusion
The main metal minerals of a copper-gold polymetallic ore are copper, gold and lead, and the ore bodies are semi-concealed-concealed ore bodies. The number of ore bodies is relatively large. The ore mineralization is relatively uniform, the ore body thickness is medium, and the mineralization is relatively continuous. After going to the site to conduct on-the-spot investigation and careful study of the mine geological report, the author put forward a reasonable development and utilization plan for reference and reference in the project operation process.
Article source: "World Nonferrous Metals" 2016.6
Author: Li, Yunnan Jin Yang Construction Co., Ltd.
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