勘查冲积砂金的目的在于识别金含量异常地段。这类异常地段可根据水系的性质及其年龄,地貌演化历史以及其他地质环境(包括蚀源区)特征等方面加以判断。紧接着对新发现的矿点进行定量研究,需要通过精密的测量以获得准确的数据。样品的代表性是主要问题。明确采样和分析要求对于解决由于样品大小和粒度分布的变化而出现的问题是至关重要的。野外取样一定要有足够数量以满足样品代表性的要求。 The purpose of the exploration of alluvial gold is to identify areas of abnormal gold content. Such anomalous lots can be judged according to the nature of the water system and its age, the evolution history of the landscape and other characteristics of the geological environment (including the source area). The subsequent quantitative study of newly discovered sites requires sophisticated measurements to obtain accurate data. The representativeness of the sample is the main problem. Clear sampling and analysis requirements are crucial to solve problems that arise due to changes in sample size and particle size distribution. There must be a sufficient number of field samples to meet the sample representative requirements.