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Outline
Addressing the challenges of complex and variable boundaries, low ore recovery rates, extensive roof exposure areas, and a low degree of mechanization associated with high-altitude tourmalinite-type massive orebodies, this study systematically analyzed the occurrence characteristics of the orebody to facilitate safe, efficient, and green mining operations. Four technical mining schemes were proposed, and their respective advantages, disadvantages, principal technical and economic indexes were comprehensively evaluated. Consequently, the upward drift filling mining method was identified as the optimal extraction scheme. The maximum allowable exposed areas of the orebody and surrounding rock were determined using the Mathews stability graphical method. Coupled with numerical simulations, the distribution patterns of stress, vertical displacement, and plastic zones under varying drift dimensions were elucidated, establishing the optimal drift parameters as 5 m in width and 3.5 m in height. On-site industrial tests demonstrate that the maximum roof subsidence of the stope is 19.2 mm, with no occurrences of collapse. Furthermore, the ore loss and dilution rates are 3.2% and 3.5%, respectively, representing significant reductions of 8.8 and 8.5 percentage points compared with the shallow-hole shrinkage mining with subsequent backfill method. These findings establish a robust technical paradigm for analogous mines and propel the sustainable development of high-altitude mineral resources.
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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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