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Silver Reef Group

Past Producer in Hinsdale county in Colorado, United States with commodities Silver, Copper, Lead, Gold, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10087907
MRDS ID D010741
Record type Site
Current site name Silver Reef Group
Alternate or previous names Three Jacks Group, Red Bird Group, Shy Claims, Chance Group, Silverreef Mine, Mary Murphy Mine
Related records 10288069

Geographic coordinates

Geographic coordinates: -107.47757, 37.48112 (WGS84)
Elevation 3344
Relative position 24.7 MILES S 25 E FROM SILVERTON

Site location context

Political divisions (FIPS codes)

Hinsdale(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Granite Peak(quadrangle 1:24,000 scale)

Durango(quadrangle 1:100,000 scale)

Durango(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper San Juan(hydrologic unit)

Upper San Juan(hydrologic accounting unit)

San Juan(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

San Juan National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Hinsdale
United States Colorado La Plata

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 038N;038N 005W;006W 06,07,18;01,11,12,13 Colorado

Comments on the location information

  • (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

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Gold Secondary
Zinc Critical Tertiary

Comments on the commodity information

  • PB AND ZN SULFIDES UNVERIFIED; CDM CITES PB-ZN CARBONATE ORE ON CHANCE GROUP DUMP

Materials information

Materials Type of material
Chalcocite Ore
Galena Ore
Malachite Ore
Smithsonite Ore
Sphalerite Ore
Calcite Gangue
Hematite Gangue
Limonite Gangue
Siderite Gangue

Alteration

  • (Local) Oxidation Of Fe And Base-Metal Sulfide Minerals

Analytical data

Result 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
Result 576-LB ORE SHIPMENT CONTAINED 0.2 OZ/TON AU, 38.2 OZ/TON AG, 24% CU, 4% PB
Result 9332-LB ORE SHIPMENT CONTAINED 0.02 OZ/TON AU, 10.4 OZ/TON AG, 12% CU, 3.4% PB
Result 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
Result 2478-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 125 OZ/TON AG, 4% CU
Result 19140-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 75 OZ/TON AG, 3% CU
Result 4298-LB ORE SHIPMENT CONTAINED 0.01 OZ/TON AU, 75 OZ/TON AG, 3% CU.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Elbert Formation;Ouray Formation
    Rock description Elbert Formation;Ouray Formation
    Stratigraphic age (youngest) Late Devonian

Nearby scientific data

(1) -107.47757, 37.48112
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, San Juan Basin
Type of structure Local
Structure description Unnamed Faults

Ore body information

  • Thickness 3.05M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1913
Year of last production 1928

Mining district

District name Runlett Peak-Cave Basin Area

Land status

Ownership category National Forest
Area name San Juan N. F.

Ownership information

  • Type Owner-Operator
    Owner Hinsdale Mining, Milling, And Smelting Co.
    Home office Bayfield, Co.
    First year 1929

Comments on the production information

  • 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.

Comments on the workings information

  • 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.

Reference information

Bibliographic references

  • Deposit

    STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 53, 110, 113.

  • Deposit

    COLORADO DIV. MINES INF. REPTS.

  • Production

    COLORADO DIV. MINES INF. REPTS. (ANNUALS); STEVEN AND OTHERS, 1969, P. 113 (CUMULATIVE)

General comments

Subject category Comment text
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.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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