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由于人类开采砂矿已有几千年的历史,所以往往使人产生一种错觉,以为砂矿的问题已不成为问题;实际上深究一下,却发现对它的认识还很肤浅,许多成因问题都没有解决,因此有必要重新认识砂矿.例如,对细粒和超细粒级金、铂族和金刚石的研究,以及从砂矿中提取它们的方法,至今未能解决.这个问题,早在1953年就已经探讨,60年代初,在金和铂的砂矿中出现了0.2mm粒级的组份,这些组份的重量占10~20%,是一个可观的数字,但是对这些贵重的矿物,一般都没有进行登记,所以没有把它们从砂矿中提取出来.
As mankind has been mining sand minerals for thousands of years, people often have the illusion that the problem of placer sands has not become a problem; in fact, when we dive deeper, we find that it is very shallow and many cause problems. There is no solution, so it is necessary to re-recognize the sand mine. For example, the study of fine-grained and ultrafine-grained gold, platinum-plated and diamonds, and methods for extracting them from placer have not been solved so far. In 1953, it was already discussed. In the early 1960s, there were 0.2mm grain components in the gold and platinum sand mines. These components accounted for 10 to 20% of the weight, which is a considerable number, but these are valuable. The minerals are generally not registered, so they are not extracted from the placer.