The Logan Mine is a silver, lead, zinc, and gold mine located in Dolores county, Colorado at an elevation of 9,629 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 9,629 Feet (2,935 Meters)
Commodity: Silver, Lead, Zinc, Gold
Lat, Long: 37.71722, -108.02361
Map: View on Google Maps
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Logan Mine MRDS details
Site Name
Primary: Logan Mine
Secondary: Logan Group
Secondary: Patented Claims: General Logan, MS 2476
Secondary: General Sherman, MS 2477
Secondary: General O. O. Howard, MS 2478
Secondary: General Sheridan, MS 2479
Secondary: Little Casper, MS 19665
Secondary: Goliath, MS 19665
Commodity
Primary: Silver
Primary: Lead
Primary: Zinc
Primary: Gold
Tertiary: Sulfur-Pyrite
Tertiary: Manganese
Location
State: Colorado
County: Dolores
District: Pioneer (Rico) District
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: San Juan N. F.
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1885
Discovery Year: 1885
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Colorado Plateaus
Physiographic Section: Canyon Lands
Mineral Deposit Model
Model Name: Polymetallic replacement
Orebody
Not available
Structure
Type: R
Description: San Juan Uplift, Paradox Basin
Type: L
Description: Rico Dome, Blackhawk Fault, Princeton Fault
Alterations
Alteration Type: L
Alteration Text: Oxidation Of Sulfide Ores; Silicification And Sericitization Of Sandstone
Rocks
Name: Latite
Role: Associated
Age Type: Host Rock Unit
Age Young: Pennsylvanian
Name: Latite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Paleocene
Name: Latite
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene
Name: Latite
Role: Associated
Age Type: Host Rock
Age Young: Pennsylvanian
Analytical Data
Analytical Data: ANALYSIS OF HALLOYSITE: 38.65% SIO2, 33.27% AL2O3, 0.22% FE2O3, 28.14% COMBINED H2O. ANALYSIS OF LIMESTONE: 55.1% CAO, 43.39% CO2 (BY DIFFERENCE), 0.80% SIO2, TRACE TIO2, 0.04% AL2O3, 0.07% FE2O3, 0.10% FEO (AS CARBONATE), 0.13% MNO (AS CARBONATE), 0.03% CUO (AS CARBONATE), 0.09% ZNO (AS CARBONATE), 0.25% MGO (AS CARBONATE), TRACE P2O5, TRACE S (AS PYRITE). ANALYSIS OF SANDSTONE: 83.95% SIO2, 8.92% AL2O3 (WITH SOME TIO2), 0.48% FE2O3, 0.13% FEO, 0.04% AG, TRACES PB AND CU, 0.97% MGO, 0.12% CAO, 0.06% NA2O, 3.09% K2O, 1.90% COMBINED H2O. ANALYSIS OF ALTERED SANDSTONE: 62.88% SIO2, 21.38% AL2O3 (WITH SOME TIO2), 1.09% FE2O3, LITTLE MNO, NONE TO TRACE AG, 0.34% PB, 2.00% MGO, 0.40% CAO, 0.07% NA2O, 6.59% K2O, 5.49% COMBINED H2O, 0.53% SO3.
Materials
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz
Gangue: Halloysite
Gangue: Sericite
Gangue: Gypsum
Gangue: Fluorite
Comments
Comment (Deposit): GENERALLY SOUTH-DIPPING MIDDLE AND UPPER HERMOSA SANDSTONE, LIMESTONE, AND SHALE COVERED BY EXTENSIVE LANDSLIDES BUT BELOW ARE CUT BY NW-TRENDING BLACKHAWK FAULT, DOWNTHROWN ON NE. ONE CROSSCUT SHOWS FAULT TO BE 12-FT VEIN OF QUARTZ AND PYRITE MASSES IN BROKEN COUNTRY ROCK AND GOUGE. TWO OR MORE BLANKET REPLACEMENT ORES OCCUR BETWEEN SANDSTONE AND LIMESTONE. NEAR LOGAN NO. 2 SHAFT, BLANKET IS IRREGULARLY DIPPING, CELLULAR, CRUMBLING LIMONITE GRADING INDISTINCTLY INTO FE-STREAKED, SERICITIZED SANDSTONE. NEARER LOGAN SHAFT, 3- TO 4-FT-THICK BLANKET UNDERLIES ALTERED SANDSTONE AND CONTAINS FRAGMENTS FROM IT, IS ROUGHLY LAMINATED OCHEROUS OR LIMONITIC MASS OVERLYING IRREGULAR LIMESTONE SURFACE AND SEPARATED FROM IT BY THIN, MINUTELY FISSURED, MANGANIFEROUS LAYER OF GPYSUM AND HALLOYSITE. THIS MAIN BLANKET COULD BE SAME AS THAT WORKED IN CHC AND WELLINGTON MINES.
Comment (Workings): OLD LOGAN SHAFTS INACCESSIBLE, DEPTH UNKNOWN. LOGAN TUNNEL, DRIVEN GENERALLY SE OR SSE, CONNECTS WITH LOGAN NO. 2 SHAFT AND WELLINGTON WORKINGS, AND LIES IN BLACKHAWK FAULT FOOTWALL WITH NE CROSSCUTS TO FAULT.
Comment (Deposit): Discovery Year: 1880S
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON WEST SLOPE OF CHC HILL (UNSURVEYED SECTION). ELEV AND LAT-LONG GIVEN ARE FOR LOGAN TUNNEL AND ARE FROM MCKNIGHT, 1974, PL. 1 (1930 BASE). ; INFO FROM LAND.ST :1975
References
Reference (Deposit): CROSS, WHITMAN, AND RANSOME, F.L., 1905, DESCRIPTION OF THE RICO QUADRANGLE: USGS FOLIO 130.
Reference (Deposit): BLM MINERAL SURVEYS MS 2476, 2477, 2478, 2479, 19665
Reference (Deposit): RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 390-392
Reference (Deposit): MCKNIGHT, E.T., 1974, GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723.
Reference (Deposit): PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.
Colorado Mining Photos
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