China's tungsten mining is mainly underground mining, and open-pit mining is only a small amount of surface sand. The underground mining of tungsten deposits, because most of them are located in the mountains and high mountains, its terrain is suitable for the joint development of flat, chute or flat, auxiliary shaft and chute. The main industrial facilities on the surface are mostly arranged near the main platform. Below the main level, there are blind shafts or blind inclined shafts, and individual mines are opened with clear shafts. The height of the middle section above the main flat is different, generally 30 to 70 m, and the main flat is generally 50 m below. The middle section is low, the mining ratio is large, the working conditions are good, and the recovery rate is high; the middle section is high, the mining ratio is small, the operating conditions are poor, the lost minerals are large, and the recovery rate is low. In order to adapt to the special situation of complex changes of veins, increase of ground stress and deterioration of mining conditions, the partial section is opened in the middle section (blind middle section). Many mine production practices have proved that this method is feasible. Major tungsten mine development, mining methods and mining capacity ( mining capacity ) Mine name Development method Mining method Mining volume (10,000 t/a ) Jiangxi Daji Mountain Pingyi, auxiliary shaft and slip mine joint development Shallow hole retention method, stage mining method 81.2 Xihua Mountain, Jiangxi Flat development. Eight slip mines and two auxiliary shafts Shallow hole retention method 67.3 Jiangxi Meimei Mountain Pingyi, auxiliary shaft and slip mine joint development Deep hole caving method, shallow hole retention method 33.7 Jiangxi Pangu Mountain Pingyi and auxiliary shaft joint development Ordinary retention method 43.7 Jiangxi Weikeng Pingyi auxiliary shaft joint development Comprehensive retention method 41.4 Jiangxi Thrush In the middle of the eighth section, the development of Pingyi and the following sections of the Jiuzhong section will be jointly developed with the blind shaft and the inclined shaft. Shallow hole retention method 48.6 Jiangxi Piaotang Joint development of Pingyi, blind shaft and slip mine Shallow hole retention method 19.1 Jiangxi iron mountain ridge Pingyi along the middle group Single vein shallow hole retention method, vein shallow hole retention method, medium and deep hole stage caving method 27.4 Jiangxi Xia Pingyi slip mine - slanting well joint development Shallow hole retention method, stage forced caving method 46.7 Hunan Yaogangxian Pingyi slip mine joint development Shallow hole retention method 13.8 Kawaguchi, Hunan Flat and blind inclined well joint development Shallow hole retention method twenty three Hunan Xiangdong 1~6 middle section upper plate flat shaft vertical joint development Retaining method, filling method 33 Middle section of 7~13 Hunan Yucheng Flat and blind shaft joint development Shallow hole retention method twenty two Guangdong Yaoling Pingyi shaft joint development Retaining method, filling method 33 Guangdong Shiren Joint development of Pingyi, slip mine, blind shaft and blind inclined shaft Shallow hole retention method 57.5
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Currently, more than the county-owned tungsten mine of about 90, of which the original China Nonferrous Industry Corporation directly under the metal tungsten mining enterprises 18 (referred directly under the central mining, the same below), mostly in Jiangxi, Guangdong, Hunan Three provinces. The total capacity of ore produced by tungsten mines is about 8.7 million t/a. National excavation and mining grade (WO 3 ): 0.2% in 1991 and 0.32% in 1996; mining loss rate: 15.67% in 1991 and 10.57% in 1996; ore depletion rate: 22.46% in 1991 In 1996, it was 56.9%.
The development, mining methods and mining capabilities of major tungsten mines are shown in the table below.
July 21, 2024