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美国每年要花费8500万美元用于进口金红石,大部分来自澳大利亚古海岸砂矿.美国金红石资源很少(~500万吨),主要是开采钛铁矿砂矿的副产品. 金红石用于钛金属工业和油漆颜料业.近年来钛金属的短缺影响了飞机制造业的发展. 金红石在斑岩铜矿中是次生或蚀变矿物.在蚀变岩石中,形成金红石的钛原先是存在于其他原生矿物中(见表). 据观察,金红石的丰度与颗粒大小是随铜品位的变化而变化的.钾化蚀变环境对金红石的结晶作用有利.斑岩的蚀变类型较之岩体中TiO_2的含量对金红石的富集更显重要.
The United States spends about $ 85 million annually on imported rutile, mostly from Australia’s ancient coastal sand mines, which have very little (~ 5 million tonnes) rutile resources and are by-products of the ilmenite mines that are used in the titanium industry And paints and pigments In recent years, the shortage of titanium metal has affected the development of the aircraft manufacturing industry.The rutile is a secondary or alteration mineral in the porphyry copper deposit.In the altered rock, the rutile titanium originally existed in other primary Minerals (see table) .It is observed that the abundance and particle size of rutile vary with the change of copper grade.The potassic alteration environment is favorable for the crystallization of rutile.The alteration type of porphyry is better than that of rock mass The content of TiO_2 is more important for the enrichment of rutile.