The Silver Reef Group is a silver, copper, and lead mine located in La Plata county, Colorado at an elevation of 10,971 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: 10,971 Feet (3,344 Meters)
Commodity: Silver, Copper, Lead
Lat, Long: 37.48111, -107.47694
Map: View on Google Maps
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Silver Reef Group MRDS details
Site Name
Primary: Silver Reef Group
Secondary: Three Jacks Group
Secondary: Red Bird Group
Secondary: Shy Claims
Secondary: Chance Group
Secondary: Silverreef Mine
Secondary: Mary Murphy Mine
Commodity
Primary: Silver
Primary: Copper
Primary: Lead
Secondary: Gold
Tertiary: Zinc
Location
State: Colorado
County: La Plata
District: Runlett Peak-Cave Basin Area
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: Hinsdale Mining, Milling, And Smelting Co.
Home Office: Bayfield, Co.
Years: 1929 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Year First Production: 1913
Year Last Production: 1928
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 replacement
Orebody
Not available
Structure
Type: R
Description: San Juan Uplift, San Juan Basin
Type: L
Description: Unnamed Faults
Alterations
Alteration Type: L
Alteration Text: Oxidation Of Fe And Base-Metal Sulfide Minerals
Rocks
Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Devonian
Analytical Data
Analytical Data: 576-LB ORE SHIPMENT CONTAINED 0.2 OZ/TON AU, 38.2 OZ/TON AG, 24% CU, 4% PB
Analytical Data: STEVEN AND OTHERS' (1969) SAMPLE FROM 5-TON STOCKPILE CONTAINED 0.01 OZ/TON AU, 0.64 OZ/TON AG, 2.84% CU, 0.46% PB, 5.88% ZN. FOUR ORE ASSAYS FROM SILVER REEF GROUP: 1478-LB SHIPMENT CONTAINED 0.4 OZ/TON AU, 48.9 OZ/TON AG, 30% CU, 4.8% PB
Analytical Data: 4298-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 75 OZ/TON AG, 3% CU.
Analytical Data: 19140-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 75 OZ/TON AG, 3% CU
Analytical Data: 2478-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 125 OZ/TON AG, 4% CU
Analytical Data: SELECTED ORE SAMPLE CONTAINED 25% CU AND 592 TO 1103 OZ/TON AG. FOUR ORE ASSAYS FROM THREE JACKS GROUP: 704-LB ORE SHIPMENT CONTAINED 0.02 OZ/TON AU, 620 OZ/TON AG, 28% CU
Analytical Data: 9332-LB ORE SHIPMENT CONTAINED 0.02 OZ/TON AU, 10.4 OZ/TON AG, 12% CU, 3.4% PB
Materials
Ore: Galena
Ore: Malachite
Ore: Sphalerite
Ore: Smithsonite
Ore: Chalcocite
Gangue: Limonite
Gangue: Siderite
Gangue: Hematite
Gangue: Calcite
Comments
Comment (Workings): SILVER REEF WORKINGS: 100-FT NW-HEADING CROSSCUT TUNNEL; 25 FT HIGHER IS DRIFT DRIVEN 50 FT WEST, THENCE 50 FT SOUTH; 25 FT HIGHER IS SECOND DRIFT DRIVEN 50 FT WEST, AT 25 FT FROM PORTAL IS 25-FT-HIGH GLORY HOLE CONNECTING WITH 40-FT CROSSCUT TUNNEL TO SURFACE. CHANCE GROUP WORKINGS: 40-FT VERTICAL SHAFT. SHY CLAIMS WORKINGS: UNKNOWN. RED BIRD GROUP WORKINGS: TRENCH, OPEN CUT, 137 FT OF DRILLING. THREE JACKS GROUP WORKINGS: 225-FT CROSSCUT TUNNEL DRIVEN EASTWARD WITH 30-FT NORTH DRIFT AT 150 FT, 10-FT NORTH AND 10-FT SOUTH DRIFTS AT 190 FT; 75 FT WEST OF PORTAL IS 50-FT VERTICAL SHAFT.
Comment (Commodity): PB AND ZN SULFIDES UNVERIFIED; CDM CITES PB-ZN CARBONATE ORE ON CHANCE GROUP DUMP
Comment (Production): PARTIAL PRODUCTION RECORD. FIRST SET OF ANNUAL ORE FIGURES IS FOR SILVER REEF GROUP, YEAR OR YEARS UNKNOWN; SECOND SET IS FOR THREE JACKS GROUP, YEAR OR YEARS UNKNOWN. STEVEN AND OTHERS CITE CUMULATIVE PRODUCTION FOR 1913-1916, 1921, 1924, AND 1928.
Comment (Location): (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). FROM SOUTH SIDE OF CAVE BASIN CREEK SOUTHWARD TO RUNLETT PEAK, WEST ACROSS COUNTY LINE AND ACROSS UPPER REACHES OF INDIAN CREE, INCLUDING TUCKERVILLE. ELEV AND LAT-LONG GIVEN ARE FOR COMMON CORNER OF SECS. 07, 18, 12, AND 13 (HINSDALE CO.). ; INFO FROM LAND.ST :1974
Comment (Deposit): CAMBRIAN-PERMIAN SEDIMENTARY SECTION DIPS SW AND OVERLIES PRECAMBRIAN SEQUENCE OF IRVING FM AND VALLECITO CONGLOMERATE. REPLACEMENT TYPE SULFIDES FOUND IN LOWER PART OF SECTION IN 50-FT-THICK HEMATITIC SANDY LIMESTONE IN EITHER ELBERT FM OR OURAY LIMESTONE LESS THAN 100 FT STRATIGRAPHICALLY ABOVE PRECAMBRIAN UNCONFORMITY. BED CONTAINS RELATIVELY SMALL FAULT-CONTROLLED DEPOSITS. GENERALLY N 15 E-TRENDING FAULT LIES NORTH OF AREA AND WEST OF EMERALD LAKE; N 65 TO 80 E-TRENDING FAULT DISPLACES PALEOZOIC SEDIMENTS AGAINST PRECAMBRIAN ON RUNLETT PEAK.
References
Reference (Deposit): STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 53, 110, 113.
Reference (Deposit): COLORADO DIV. MINES INF. REPTS.
Reference (Production): COLORADO DIV. MINES INF. REPTS. (ANNUALS); STEVEN AND OTHERS, 1969, P. 113 (CUMULATIVE)
Colorado Mining Photos
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