甘肃省文县让水河一带砂金矿矿体地质特征

Geological Characteristics of Placer Gold Ore Body in Wenxian,Gansu Province

矿区属让水河的下游,砂金矿床为现代河谷冲积型砂金矿床。总长5 500 m,由两个矿体组成。分别为Ⅰ号、Ⅱ号矿体。矿体主要赋存在让水河河床。河漫滩及Ⅰ级阶地中。矿体为长条带状呈东西向展布。砂金主要赋存在松散砂砾层中,砂砾层砾石含量63%~80%,砂12%~22%,泥5%~25%。其中巨砾100~250 mm占8.55%,250~300 mm占3.62%,300~350 mm占2.47%,350~400 mm占2.74%,400~500 mm占2.88%,>500 mm占8.47%,合计为28.7%。

The mining area belongs to the downstream of the water river, and the sand gold deposit is a modem Valley allu- vial gold deposit. It has a total length of 5 500 meters and consists of two orebodies. They are no. I and No. II orebodies, re- spectively. The ore bodies mainly lie in the water river bed. River floodplain and grade I terrace. The ore body is a long strip of East-West distribution.There are loose gravel layer in placer gold hosted mainly gravel gravel content 63% - 80%, 12% 22% sand mud, 5%-25%. Which accounted for 8.55% of 100-250 mm Boulder, 250-300 mm 300-350 mm accounted for 3.62%, accounting for 2.47%, accounting for 2.74% of 400-500 mm 350-400 mm, accounting for 2.88%, 〉500 ac- counted for 8.47% of total 28.7% mm.