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Cavity left after a concretion fell out of the mine roof

Arthur Lakes Library
; 
Russell L. and Lyn Wood Mining History Archive
; 
United States. Bureau of Mines
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Advisor
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Date
1900?-1999?
Date Issued
Date Submitted
Keywords
Scenes, underground
 Underground mining
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Mining History - Images
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[Cavity left after a concretion fell out of the mine roof].
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URI
http://hdl.handle.net/11124/6028
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Abstract
Cavity left after a concretion fell out of mine roof. The concretion that fell out is not the one shown in top photograph. Note slickensided surfaces adjacent to cavity.
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