EMPIRE Marysville District. Lewis & Clark County. Minerals Yearbook 1934. Sta. App. Page 399. Treated old tailings by concentration and shipped concentrates and old mill clean-up to the smelter.
WPA, "Empire" (1934). Minerals Yearbook, All. 382.
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Empire, Marysville District, Lewis & Clark County, tailings, mill, clean-up