Full
Outline
Based on the theory of synergistic mining, the technical challenges such as handling hidden danger in goaf, recycling hidden trouble resources, and ensuring safe and efficient mining of deep ore bodies have been solved for the difficult-to-mine ore bodies in a tungsten mine in southern Jiangxi Province. Four innovative mining designs were proposed, including changing the mining method from the empty-field method to the caving method, taking hidden trouble resources as cover rock layers for deep mining, using the goaf as a free blasting space for cutting grooves and cushion layers, as well as synergistic applying shallow and medium-deep hole blasting technologies. On this basis, the mining design and application of the segmented rock excavation stage caving method were carried out. The results of mining practice show that the segmented rock excavation stage caving method is suitable for dense vein mining. Compared with the original shallow hole shrinkage method, the mining loss rate of this mining method is reduced from 22% to 3%−5%, the daily production capacity of the stope is increased from 65 t to 260 t, the unit consumption of explosives is reduced from 1.18 kg/t to 0.57 kg/t, and the cost per ton of ore is reduced from 65.54 yuan to 33.26 yuan. It is indicated that the theory of synergistic mining has a significant application value in the mining of dense ore bodies in tungsten mines. The research results provide a technical solution that can be used as a reference for dealing with similar problems in mines.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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