To effectively manage and control mine costs and guide enterprises in reducing costs and increasing efficiency, a cost target system was established based on the complete cost. Using Analytic Hierarchy Process (AHP), statistical analysis, graphical methods and case studies, systematic comparison and analysis were conducted on the complete costs of four medium-sized lead-zinc mines both domestically and internationally. The following conclusions are drawn. Mining methods, development systems, and production scales are crucial for controlling complete cost of mines. The compositions of complete cost in descending order of proportion are production cost, taxes and surcharges, administrative expenses, operating expenses, and financial expenses. The complete cost of mines has a scale effect, the larger the production scale, the lower the unit cost. For projects of the same production scale, the complete cost of foreign mines is higher than that of domestic mines. For medium-sized lead-zinc mines, the complete cost of lead is in the range of 10 000 to 17 000 yuan/t, and the complete cost of zinc is in the range of 6 000 to 12 000 yuan/t. The research findings can provide a reference for cost control in the practical production of lead-zinc mines.
| 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 |