The rare bismuth mineral, aikinite (Cu 2 S.2PbS.Bi 2 S 3 ), was found in such abundance at the St. Louis mine in Butte County, Idaho, that, because of a high silver content, it was hand-sorted and shipped to smelters. It is here shown that the high silver content was the result of selective replacement of the aikinite by supergene argentite and native silver.The deposit belongs to the group of epithermal deposits of mid-Tertiary age and is enclosed in Tertiary andesite and tuff. The geologic setting- and a fairly detailed description of the occurrence are given.

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