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Concentrating mill, Midnight tunnel portal, Pitkin County

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1939
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Keywords
Underground mining -- Colorado -- Pitkin County
 Mineral processing plants -- Colorado -- Pitkin County
 Mine buildings -- Colorado -- Pitkin County
 Silver mines and mining -- Colorado -- Pitkin County
 Lead mines and mining -- Colorado -- Pitkin County
 Aspen Mining District (Colo.)
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Colorado Mining Association Collection
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https://hdl.handle.net/11124/181831
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Abstract
Concentrating mill, Midnight tunnel portal, Aspen district (Roaring Fork district), Pitkin County. Caption reads: "Ore conveyor bins and concentrating mill, Midnight Tunnel Portal, Aspen Dist. Colo. 12-18-39." "Pitkin Co."
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Copyright retained by Colorado Mining Association.
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