Study on hydrochemical mineralization factor of gold placer 砂金水化学成矿因素探讨
2.
" dug jade " ing , this exploitation and d s placer means have already stopped , only while quarrying and drawing gold dust , electing the jade one from the gravel that is dug out , in passing , output is very few “挖玉”这一开采和阗砂矿的手段已经停止，只在采掏砂金的同时，从挖出的砾石中顺带选出玉块，产量微乎其微。
