The steps of mining method selection can be divided into three steps: method primary selection, technical economic analysis and comprehensive analysis comparison. In the design practice, the optimal solution can be obtained through the comparison of primary selection and technical economic analysis. Sometimes it is necessary to conduct a comprehensive analysis and comparison before determining the optimal solution.
(i) Primary selection of mining methods.
According to the geological conditions of the deposit and the technical and economic conditions of the mining, as well as the requirements of the country, several available mining schemes can be drawn up. Each scheme must determine its constituent elements, acquisition, cutting arrangement and mining process. A representative nugget, draw a standard map of mining methods, and list the technical and economic indicators of these programs. (Generally choose 2-3 programs).
(ii) Technical and economic analysis of mining methods
Commonly used technical and economic analysis indicators are:
(1) Labor productivity of the nuggets (tons/work shifts);
(2) The amount of mining and cutting work (m/ton) (compared with the calculated indicators when designing);
(3) Production capacity of the ore block (ton/day; ton/month, which is determined according to the output of each class of mining equipment);
(4) Consumption of main materials (pits, explosives, etc.);
(5) Loss and depletion rate of ore;
(6) The direct cost of producing ore.
The above indicators are generally not calculated in detail, but are selected according to the actual data indicators of the mines based on the components of the mining method. It is necessary to comprehensively analyze the problems in geological factors and economic factors of mining technology. In addition, the safety level of each program, labor conditions, and complexity of the process must be considered. Attention should also be paid to the amount of infrastructure, infrastructure investment and infrastructure time associated with mining methods.
In most cases, after such a technical and economic analysis, it can be determined which one is adopted as follows. Only in a few cases requires a comprehensive analysis and comparison to determine which option to use.
(III) Comprehensive analysis and comparison of mining methods
After the above preliminary analysis and comparison, if you can't judge the pros and cons of the scheme, you should make a detailed comprehensive analysis and comparison of the 2-3 schemes that are difficult to distinguish between the superior and the inferior, and finally select the optimal scheme. The so-called comprehensive analysis and comparison is To calculate the economic account in detail, if you want to calculate the cost of ore, the final product cost, profit, etc. This part will be covered in the next volume of this book.
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