Mine detail: Logan Mine

Previously called 'Logan GroupPatented Claims: General Logan, MS 2476General Sherman, MS 2477General O. O. Howard, MS 2478General Sheridan, MS 2479Little Casper, MS 19665Goliath, MS 19665'

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Location

Lat / long:

37.71723, -108.02426

Resource(M)

Primary:	Silver, Lead, Zinc, Gold
Tertiary:	Sulfur-Pyrite, Manganese
Ore:	Pyrite, Sphalerite
Gangue:	Fluorite, Gypsum, Halloysite, Quartz, Sericite
Discovery year:	1885

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1885

Geology

Host rock:	Hermosa Formation
Host type:	Sandstone,Limestone
Associated rock:	Hornblende Latite Porphyry
Associated type:	Latite
Structure:	San Juan Uplift, Paradox Basin, Rico Dome, Blackhawk Fault, Princeton Fault
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Oxidation Of Sulfide Ores; Silicification And Sericitization Of Sandstone

References

MRDS	D010776
DEP	10014132
Reference	{Deposit:: MCKNIGHT, E.T., 1974, GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723.}{Deposit:: PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.}{Deposit:: RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 390-392}{Deposit:: CROSS, WHITMAN, AND RANSOME, F.L., 1905, DESCRIPTION OF THE RICO QUADRANGLE: USGS FOLIO 130.}{Deposit:: BLM MINERAL SURVEYS MS 2476, 2477, 2478, 2479, 19665}
Reporter	Schwochow, Stephen D.