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重砂测量,是普查找矿常用而又比较有效的手段之一,但是对黄金普查来说,它却有很大的局限性.因为重砂测量之所以有效,除了矿物本身有较大的比重外,还须具备几个前提条件,即:1.重矿物颗粒的大小,必须能在一般重砂鉴定仪器中分辨出来;2.某种重矿物若赋存于其他矿物中,则必须使之从寄居矿物中解离出来;3.矿床必须经地表暴露,长期受风化剥蚀,为重砂提供物质来源. 根据这几个前提考察,就会发现以下问题: 1.有的金矿床,黄金粒度极小,小到在双目镜下无法分辨.如山东某金矿,黄金粒径小于0.5微米者占9.19%,0.5～6微米者占29.93%,6～50微米者占44.42%,大于
Heavy sand measurement is one of the commonly used and effective methods for prospecting prospecting, but it has great limitation for gold census.Because heavy sand measurement is effective, besides the mineral itself has a larger proportion , But also must have a few preconditions, namely: 1. The size of heavy mineral particles, must be able to distinguish in the general heavy sand identification equipment; 2. If a heavy mineral occurs in other minerals, you must make it Dissociated from the host minerals; 3 deposit must be exposed by the surface, long-term weathering and denudation, provide material source for the heavy sand.According to these preconditions investigated, you will find the following questions: 1. Some gold deposits, gold size Small, small to distinguish in the binocular .As a gold mine in Shandong, gold particles smaller than 0.5 microns accounted for 9.19%, 0.5 to 6 microns accounted for 29.93%, 6 to 50 microns accounted for 44.42%, greater than