A tour guide killed at a former Colorado gold mine last year fell out ... Steve Schafrik, a University of Kentucky associate professor of mining engineering, said that at commercial mining ...
DENVER (AP) — A tour guide killed at a former Colorado gold mine last year fell ... Steve Schafrik, a University of Kentucky associate professor of mining engineering, said that at commercial ...
DENVER — A tour guide killed at a former Colorado gold mine last year fell ... Steve Schafrik, a University of Kentucky associate professor of mining engineering, said that at commercial mining ...
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