Distribution of China's tungsten resources how?

Tungsten eletrode content in the crust less heavy crust only 0.007 percent. About 20 different natural weight tungsten minerals, mainly wolframite (tungsten, manganese ore) and scheelite (calcium tungsten ore). World's biological resources are mainly concentrated in the Asian area, while China's tungsten ore reserves account for more than half the world's total reserves. Production and export of China's tungsten are also in the world, has always been international as "tungsten kingdom." Jiangxi and Hunan provinces tungsten ore reserves and accounted for more than half the country's total reserves. In addition, Guangdong, Fujian and Guangxi, tungsten ore is also very rich. Mining of ore grade of tungsten trioxide generally contain 0.2 to 0.5%. Jiangxi Dajishan, West Mountain and several other tungsten ore, Yaogangxian Hunan, Guangdong and other places Shiren peaks, are important tungsten base.