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一、实验目的和任务 在砂金地质工作中,自普查到勘探各个阶段都有大量的矿样淘洗和重砂分离工作。几年来,我指挥部所属各支队一直沿用木质淘洗工具,进行人工淘洗。北方各支队一般用盘底无砂槽“西伯利亚”木质船形淘金盘和盘底刻有横向聚砂小槽,三面有帮的簸箕形淘金盘;南方各支队一般用渔尾式淘砂盘和马来西亚流浪盘。这几种工具在野外进行淘洗基本是可行的,并取得了一定的成果。但用这些工具进行淘洗,人为因素影响比较大,如在某矿区曾用人工制样投入金粒检查淘洗质量,一次回收率仪达60—70％,个别样回收率为零。这说明人工淘洗过程中由于人为因素的影响,可导致砂样中金的大量流失,以至造成漏矿、贫化矿体和减小矿体规模的严重后果。另一方面砂金勘探过程中,
First, the purpose and mission of the experiment Gold placer geology work, since the census to exploration in all stages have a lot of ore panning and heavy sand separation work. In recent years, all the detachments under my command have been using wood washing tools for artificial panning. The northern detachment generally use the bottom of the tray without a sand tank “Siberian” wooden boat shaped gold plate and the bottom of the tray engraved with a small cross-sands of small tanks, three sides are helpful for the pan-shaped gold pan; the southern detachment of fishing trailers generally panning with Amoy and Malaysia Rovers. These types of tools in the field washing is basically feasible, and achieved some results. However, the use of these tools for panning, human factors have a greater impact, such as in a mining area has been used to check the quality of gold into the panning quality, a recovery rate of 60-70%, individual recovery rate of zero. This shows that the artificial eluviation process due to human factors, can lead to a substantial loss of gold in sand samples, as well as the result of ore leakage, depleted ore bodies and reduce the serious consequences of ore body size. On the other hand, the process of gold exploration,