Mine detail: Earl Lode

Previously called ''

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Location

Lat / long:

43.75246, -103.52806

Resource(B)

Primary:	Feldspar, Mica, Beryllium
Tertiary:	Lithium
Ore:	Albite, Beryl, Lithiophilite, Muscovite
Gangue:	Cleavelandite, Microcline, Quartz, Tourmaline, Triphylite
Orebody form:	DIKE

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1937

Geology

Host rock:	Quartz Sandstone And Graywacke
Host type:	Sandstone
Associated rock:	Pegmatite
Associated type:	Pegmatite
Alteration processes:	Albitization Has Been Prevasive

References

MRDS	SD02296
DEP	10055682
Reference	{Deposit:: U.S. BUREAU OF MINES, 1954, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 1, BUREAU OF MINES INFORMATION CIRCULAR 7688}{Deposit:: FISHER, D.J., 1945, PRELIMINARY REPORT ON THE MINERALOGY OF SOME PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50}{Production:: U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707}
Reporter	Barari, Rachel A.