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1981～82年间,我系师生在陕西境内秦岭下泥盆统底部西岔河组(原韩城沟组)砾岩中,发现了一个新的含金层位.西岔河组由砾岩、砂砾岩、含砾砂岩及含砾泥灰岩组成.发现的含金层位为一层砂砾岩,厚约5米,呈大透镜体状.沿东西走向已追索800米,向两端变薄并相变为砾岩.在砾岩分布区也淘出过片状自然金,估计砾岩中也会有含金层位. 砂砾岩的含矿地段有明显的硅化、黄铁矿化、铁白云石化和轻微的绢云母化.不规则状、片状和细粒状自然金,粒径0.05毫米左右;用捡块、刻槽及人工重砂法取样分析,金均达到工业品位. 含矿地段发育有石英细脉,但含金不高,只能作为一种矿化标志.
From 1981 to 1982, teachers and students of our department found a new gold-bearing layer in the conglomerate of the Xichahe Formation (formerly Hanchenggou Formation) at the bottom of the Qinlin Mountains in Shaanxi Province. The Xichahe Formation is composed of conglomerate , Sandy conglomerate, gravel sandstone and boulder marl.The gold layer discovered is a layer of glutenite, about 5 meters thick with a large lens-like shape and has been traced 800 meters along the east-west direction to the ends Thinning and phase change into conglomerate.According to the flake natural gold also eluted in the conglomerate distribution area, it is estimated that there are gold-bearing layers in the conglomerate.The siliceous ore-bearing sections have obvious silicification and pyrite mineralization , Iron dolomitization and slight sericitization.An irregular, flaky and fine grained natural gold, particle size of about 0.05 mm; with picking block, groove and artificial sand sampling analysis, the average industrial grade to achieve. Quartz vein vein development, but the gold is not high, only as a sign of mineralization.