固体矿产地质勘查中刻槽样的代表性

Representativeness of trench samplings in solid mineral resources geological exploration

固体矿产地质勘查基本分析样品必须有岩矿石物质组构的代表性,刻槽样是最常用的基本分析样品,其代表性主要决定于岩矿石物质组分的均匀程度、样槽的断面规格和样槽的布设位置。岩矿石的物质组分分布越均匀,样槽断面规格越大,样品体积越大,样品的代表性越好。样槽断面规格过小、布设不合理、样品重量误差超限,都会影响地质勘查工作质量和成果的可靠性乃至矿床的技术经济评价结论。本文从岩矿石的物质组分均匀性和勘查工作程度的要求等方面,就常见矿种勘查工作中刻槽样规格的选取进行了全面论述,这对矿产地质勘查项目工作方案的制定和实施有一定的指导意义。

samples collected in solid mineral resources geological explorations must exhibit the represent activeness of material fabrics of rocks and ores. Representativeness of samplings is decided by the uniformities of material components, and section specifications and layouts of samples. The more uniform is the distribution of material components of rocks and ores, and the bigger is the size of sections of sample cells and the larger is the volume of samples, the better is the representativeness of samplings. Some disadvan- tageous factors, such as too little size of sections of sample cells, irrational layout and exceeding limit of sample weight error, will affect the reliability of geological prospecting work quality, technical and economic evaluation of deposits. Based on the uniformities of material components of rocks and ores, and the degrees of explorations, this paper makes a comprehensive discussion on the selection of trench samplings in solid mineral resources geological explorations, which has an important guiding significance for planning and implementation of working schemes of mineral resources geological explorations.