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由于砂金矿层中砂金分布的不均匀性,使有限体积的取样所取得的砂金品位数据,与矿砂层真实品位之间存在误差。因此,在允许接受的误差范围内,有必要确定最合理的采样体积。笔者所做的砂金取样规格试验表明,砂金品位误差随着取样体积减小而增大.且有随矿砂层巨砾含量和分选系数的增大而增大的趋势,当矿砂层的平均粒径不大于25mm或巨砾系数不大于0.14时,砂金取样体积可小于2(?);当平均粒径大于55mm或巨砾系数大于0.38时,取样体积则应大于2(?),这可保证砂金取样由于体积有限而带来的品位相对误差小于20(?)。
Due to the non-uniformity of the gold distribution in the gold-gold deposit, there is an error between the gold-grade data obtained from the sampling with a limited volume and the real grade of the ore layer. Therefore, it is necessary to determine the most reasonable sampling volume within the acceptable error range. Sampling experiment of placer gold made by the author shows that the error of placer gold grade increases with the decrease of sampling volume and tends to increase with the increase of boulder content and sorting coefficient of ore layer. When the diameter is not more than 25mm or the boulder coefficient is not more than 0.14, the sampling volume of the gold can be less than 2 (?); When the average particle diameter is more than 55mm or the boulder coefficient is more than 0.38, the sampling volume should be greater than 2 Sapphire sampling due to the limited size of the relative error of less than 20 (?).