The proportion of stones in Duchang Jinding tungsten-molybdenum mining industry is 2.6 grams per cubic centimeter to 3.0 grams per cubic centimeter. Duchang Jinding Tungsten and Molybdenum Mining Co., Ltd. was established in April 2006, located in Yangchushan, Tutang Town, duchang county, Jiujiang City, Jiangxi Province, and mainly engaged in the mining, processing and sales of tungsten and molybdenum mines.