Ballard Mine, Custer District, Custer Co., South Dakota, USA
REF:Deposit:: US BUREAU OF MINES, 1955 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2 , BUREAU OF MINES INFORMATION CIRCULAR 7707P
Production:: US BUREAU OF MINES, 1955 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2 , BUREAU OF MINES INFORMATION CIRC
Deposit:: PAGE,L R ET AL,U S G S P P 247 P 65 1953
Commodities (Major) - Mica, Feldspar; (Minor) - Beryllium; (Trace) - Niobium (Columbium), Tantalum
Development Status: Past Producer
Structure: Anticlinal Fold
Host Rock: Pegmatite
| Beryl|| 'K Feldspar'|| Muscovite|| Quartz|
4 entries listed. 3 valid minerals.
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Locality Updated: Silver Lake Mine, South Sherbrooke Township, Lanark Co., Ontario, CanadaFrom Reiner Mielke, 9th Mar 2014 20:26:08