The Missouri Girl Mine is a copper mine located in Montezuma county, Colorado at an elevation of 8,199 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: 8,199 Feet (2,499 Meters)
Commodity: Copper
Lat, Long: 37.57889, -108.17889
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Missouri Girl Mine MRDS details
Site Name
Primary: Missouri Girl Mine
Secondary: Missouri Girl Deposit
Commodity
Primary: Copper
Location
State: Colorado
County: Montezuma
District: Bear Creek 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
Type: Unknown
Ownership
Owner Name: T.L. Jackson, C.L. Snyder, C.F. Eggers
Info Year: 1953
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Year First Production: 1909
Discovery Year: 1909
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 veins
Orebody
Form: VEINLETS, LENTICULAR MASSES, DISSEMINATED
Structure
Type: R
Description: San Juan Uplift (San Juan Mountains), La Plata Mountains Dome
Type: L
Description: Small Ne-Trending Fault About 0.5 Mile To Northwest; Parallel Faults, Fractures
Alterations
Alteration Type: L
Alteration Text: Hydrothermal Alteration, Bleaching
Rocks
Name: Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Triassic
Name: Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Triassic
Name: Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene
Name: Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene
Analytical Data
Analytical Data: SORTED ORE CONTAINED 25-30% CU
Analytical Data: UNSORTED ORE REPORTED TO CONTAIN 4-5% CU
Materials
Ore: Chalcocite
Ore: Malachite
Gangue: Pyrite
Gangue: Limonite
Gangue: Calcite
Comments
Comment (Development): FROM 1904-1931 NO PRODUCTION WAS LISTED. DURING 1931-1939 AND 1941 SMALL AMOUNTS OF AU WERE RECOVERED BY SLUICING.
Comment (Deposit): MAY HAVE BEEN 2 SOURCES FOR GOLD. IT HAS BEEN DESCRIBED AS LIGHT YELLOW AND DULL YELLOW.
Comment (Production): ESTIMATE PRODUCTION AS GREATER THAN $30000.
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON NORTH SIDE OF LA PLATA MOUNTAINS, ALONG BEAR CREEK NEAR ITS JUNCTION WITH DOLORES RIVER; SOUTH AND SOUTHWEST OF RICO; UNSURVEYED; NORTH OF DOLORES RIVER OPPOSITE STEWART GULCH ; INFO FROM LAND.ST :1976
Comment (Production): 2 OR 3 CARLOADS OF UNSORTED ORE CONTAINING 4-5% CU SHIPPED IN 1909-10. TOTAL PRODUCTION ABOUT 6 CARLOADS
Comment (Geology): ALL OF THE DEPOSITS IN THIS AREA ARE CLOSELY RELATED TO THE MONZONITE PORPHYRY DIKES
Comment (Deposit): DEPOSIT WITHIN 40 FT OF BORDER OF MONZONITE PORPHYRY DIKE, CONCENTRATED IN FRACTURED COALY SEAMS IN SANDSTONE
Comment (Workings): 3 PARALLEL TUNNELS EACH 40 TO 80 FT LONG, ONE CROSSCUT TUNNEL; WORKINGS EXPLORE 3 SMALL, STEEPLY DIPPING FAULTS ALONG BORDERS OF DIKE, TWO ON EAST SIDE, ONE ON WEST SIDE OF DIKE.
Comment (Deposit): Merged and deleted record 10239503, derived from MAS 0080830080, listed "Green Frog" as a previous name. A.B. Wilson was unable to confirm this information. It is not mentioned in PP-219. Same record listed holdings as a located claim.
Comment (Reference): All references except PP-219 are from the deleted record 10239503.
Comment (Production): Deleted record 10239503 estimates production at 150 tones ore.
Comment (Ownership): Ownership info from deleted record 10239503.
Comment (Location): LAT LONG ARE GENERAL FOR DISTRICT. UNSURVEYED AREA. ; INFO FROM LAND.ST :(1959)
Comment (Geology): PLACER AU PROBABLY ORIGINATED IN SMALL VEINS RELATED TO THE TERTIARY INTRUSIVES OVER WHICH THE CREEK FLOWS.
References
Reference (Deposit): GODDARD, E.N., 1949, COPPER DEPOSITS OF THE BEAR CREEK DISTRICT, IN ECKEL, E.B., 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 70-72, 150-152.
Colorado Mining Photos
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