 | | Journal (article/letter/editorial) | | last twenty-five years either as a result of new mining operations or as new discoveries in abandoned mines...Boulder County, but gave no details. He also mentioned that wulfenite occurred in Park County, but again...occurrence on Gunnell Hill, Central City district, Gilpin County, given by J. S. Randall (1887) in his book...(Charlton, 1890) in the isolated Silver Cliff district, Custer County, but again, like other early reports, no...list of minerals from the Breckenridge mining district, Summit County, Lovering (1934) notes that wulfenite |  | | Report (issue) | | and Tertiary Age of the Northern Black Hills, South Dakota by Lewis H. Shapiro I APR 2 3 1970 DENVER...Geological Engineering South Dakota School of Mines and Technology Rapid City, South Dakota Submitted in accordance...AND IN ALL EARLIER LITERATURE ON THE RUBY BASIN DISTRICT. COLOR KEY FOR ALL MAPS IN THIS REPORT Rock....... 45 Mining Districts ....................... 49 4.1 Bald Mountain Mining District ............Bald Mountain District ....... 49 4.13. Geology of the Bald Mountain Mining District ... 51 ... |
|
