The Muldoon Mine is a silver mine located in La Plata county, Colorado at an elevation of 11,831 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: 11,831 Feet (3,606 Meters)
Commodity: Silver
Lat, Long: 37.445, -107.99944
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Muldoon Mine MRDS details
Site Name
Primary: Muldoon Mine
Secondary: Patented Claim: Muldoon, MS 2356
Secondary: Unpatented Claims: Independence
Secondary: Cumberland
Commodity
Primary: Silver
Secondary: Gold
Tertiary: Antimony
Tertiary: Arsenic
Location
State: Colorado
County: La Plata
District: California (La Plata) 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
Owner Name: Mrs. Herman Dalla
Home Office: Durango, Co.
Years: 1960 -
Owner Name: Todeski, Herman
Home Office: Durango, Co.
Years: 1960 -
Production
Year: 1919
Material type: AG ACC
Description: Ap_Grade: ^514.33 Oz/Ton Ag, 0.253 Oz/Ton Au
Year: 1918
Material type: AG ACC
Description: Ap_Grade: ^158.5 Oz/Ton Ag, 0.06 Oz/Ton Au
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year Last Production: 1949
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: Navajo Section
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Type: R
Description: San Juan Uplift, Four Corners Platform
Type: L
Description: La Plata Dome
Alterations
Not available
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Permian
Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Permian
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Paleocene
Analytical Data
Not available
Materials
Ore: Pyrargyrite
Ore: Gold
Ore: Proustite
Gangue: Barite
Gangue: Quartz
Comments
Comment (Production): PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE PRIOR TO 1917; NO PRODUCTION FROM 1920-1935, FROM 1936-1948, AND AFTER 1949, ORE TONNAGES AND GRADES FOR 1935 AND 1949 FROM COLO. DIV. MINES ANN. OPERATOR REPTS.
Comment (Development): EARLY HISTORY UNCERTAIN, WORKED BY P.W. PITTMAN FROM 1917 TO 1919, THEN LEASED TO HERMAN DALLA AND DAVID BIANCHI. ALTHOUGH LAST PRODUCTION WAS 1949, DEVELOPMENT WORK (NEW TUNNELS AND DRIFTS) CONTINUED FROM 1956-1959.
Comment (Deposit): COUNTRY ROCK CONSISTS OF UPPER CUTLER FM RED BEDS INTRUDED BY DIORITE-MONZONITE PORPHYRY SILLS AND DIKES AND IS TRAVERSED BY QUARTZ-BARITE VEIN TRENDING N 71 E. IN UPPER LEVEL OF MINE, VEIN IS VERTICAL, BUT DIPS NORTHERLY IN LOWER LEVEL.
Comment (Workings): OLDER WORKINGS CONSIST OF LOWER TUNNEL DRIVEN S 8 W FOR 80 FT TO VEIN WITH 40 FT OF DRIFT, UPPER TUNNEL DRIVEN DUE SOUTH FOR 40 FT TO VEIN WITH 40-FT SW DRIFT AND 65-FT NE DRIFT. LATER DEVELOPMENTS INCLUDE AT LEAST SEVERAL HUNDRED FEET OF CROSSCUT TUNNEL AND DRIFTS.
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON EAST RIDGE OF CUMBERLAND MTN IN HEADWATERS OF JUNCTION CREEK, 4.65 MILES NE OF LA PLATA TOWNSITE (UNSURVEYED SECTION). ; INFO FROM LAND.ST :1974
References
Reference (Deposit): ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-74, 155-156.
Reference (Deposit): BLM MINERAL SURVEY MS 2356
Reference (Deposit): COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
Reference (Production): ECKEL AND OTHERS, 1949, P. 156 (AS COMPILED FROM USGS AND USBM RECORDS); COLORADO DIV. MINES ANN. OPERATOR REPTS.
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
