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Outline
A certain iron mine has been using the non-pillar sublevel caving mining method since the start of its operation. Due to severe surface subsidence and high dilution and loss rates of ore, the mine plans to use the filling mining method for the extraction of deep ore bodies. Considering the stability of the ore rock, three filling mining schemes were proposed for areas with poor surrounding rock stability, namely the sublevel filling mining method with pre-controlled roof and rib protection, the upward bench approach filling mining method with pre-controlled roof, as well as the combined mining method of downward approach and upward medium-length hole. After comprehensive comparison of the technical and economic indicators of different schemes and the advantages and disadvantages of each scheme, the combined mining method of downward approach and upward medium-length hole was finally adopted for extracting ore bodies in the unstable deep areas of the mine. Under the condition of fixed mining level height and stope span, numerical simulation was used to optimize the sublevel height. Based on the mine's production capacity requirements, the optimal sublevel height was determined to be 20 meters through optimization analysis. In the mine, the optimized mining method was applied to extract a total of 324 000 tons of hard-to-mine iron ore, generating 69.3 million yuan in revenue and 7.7 million yuan in profit for the mine.
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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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