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Concretion sitting high in mine roof and bolted to prevent falling

Arthur Lakes Library
; 
Russell L. and Lyn Wood Mining History Archive
; 
United States. Bureau of Mines
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Advisor
Editor
Date
1900?-1999?
Date Issued
Date Submitted
Keywords
Mine supports
 Underground mining
Collections
Mining History - Images
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[Concretion sitting high in mine roof and bolted to prevent falling].
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Journal Issue
URI
https://hdl.handle.net/11124/6033
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Abstract
The image shows a concretion in a mine roof of an unknown underground mine.
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Rights management statement available at: http://library.mines.edu/digital/rights.html
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