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自然重砂矿物通常被用来解释沉积物的产生、搬运、物源特征以及地球化学等性质,然而即使是化学成分较稳定的锡石,也很少有人研究其矿物组合在锡矿找矿中的指示作用,特别是对中国重要的锡矿富集区——滇西锡成矿带而言。锡矿中自然重砂矿物的组合可指示出源区原生矿床的种类及矿床成因等信息,为新矿床的发现界定相关靶区位置。研究结果显示,来利山锡矿重砂矿物组合中不仅有锆石、磷灰石、绿帘石、金红石、锐钛矿等大多数花岗岩常见的重砂矿物,亦报出了含锡花岗岩特有的一种气成矿物——电气石,来自含锡花岗岩的重砂矿物百分含量均不高(<3%)。同时,在短距离搬运过程中,重砂矿物组合以锡石+黄铁矿+磁铁矿为主,伴随有独居石、赤铁矿、褐铁矿等。重砂矿物组合中黄铁矿的大量报出表明其成矿源区主体为锡石—硫化物型锡矿体而非云英岩型锡矿体。
Natural heavy grit minerals are often used to explain sediment generation, handling, provenance characteristics, and geochemical properties. However, even the more chemically stable cassiterites are rarely studied for mineral assemblages in prospecting for tin deposits , Especially for the western tin mineralization belt, an important tin-rich area in China. The combination of natural heavy sand minerals in the tin ore can indicate the types of primary ore deposits and the genesis of the deposits in the source area, and define the location of the relevant targets for the discovery of new deposits. The results show that the heavy sand mineral assemblage in the Lai Lishan coal mine not only includes the common heavy sand minerals of most granites such as zircon, apatite, rutile, rutile and anatase, but also contains the special characteristics of tin-bearing granite Of the gas-forming minerals - tourmaline, from the granite containing tin content of heavy sand minerals are not high (<3%). In the meantime, in the process of short-distance handling, the heavy sand mineral assemblage is dominated by cassiterite + pyrite + magnetite accompanied by monazite, hematite and limonite. The heavy accretion of pyrite in the heavy sand mineral assemblages indicates that the main source of the metallogenic source is cassiterite-sulphide-type tin orebody rather than neocelite-type tin orebody.