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首页> 美国政府科技报告 >Tin Occurrences Associated with the Ohio Creek Pluton, Chulitna Region, South-Central Alaska
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Tin Occurrences Associated with the Ohio Creek Pluton, Chulitna Region, South-Central Alaska

机译：锡事件与阿拉斯加中南部Chulitna地区的俄亥俄河普鲁顿相关联

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In 1984 and 1985 the Bureau of Mines mapped and sampled reported tin occurrences associated with the Ohio Creek pluton, in the central Alaska Range, south-central Alaska. The pluton is a composite intrusion with a core of moderately coarse-grained biotite granite and an outer zone of finer-grained leucocratic muscovite granite. Tin mineralization, associated with silver, base-metal, and tungsten values, occurs within the muscovite granite as cassiterite (SnO2) within both quartz-muscovite greisen and arsenopyrite veins. Silver occurs within argentiferous galena and argentite (Ag2S); tungsten is present in the Mn-rich wolframite mineral huebnerite (MnWO4). Metallurgical testing of three large samples of tin mineralized greisen showed tin recoveries of 27-64% in table concentrates. A low-grade zone near the pluton's upper contact is inferred to contain a resource of approximately 1,250,000 lb Sn.

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