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Exchequer Tunnel

Occurrence in Mineral county in Colorado, United States with commodities Silver, Lead, Gold, Copper, Manganese
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Geologic information

Identification information

Deposit ID 10012359
MRDS ID D007951
Record type Site
Current site name Exchequer Tunnel
Related records 10166971

Geographic coordinates

Geographic coordinates: -106.92979, 37.86723 (WGS84)
Elevation 2950
Relative position 0.95 MILES N 07 W FROM CREEDE (B.M. 8853 AT NORTH END OF TOWN)
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Geographic areas

Country State County
United States Colorado Mineral

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 042N 001W 24,25 SE OF SW OF SE (24); NE OF NW OF NE (25) Colorado

Comments on the location information

  • S-T-R, LAT-LONG, AND ELEV DETERMINED FROM EMMONS AND LARSEN'S (1923) TOPO MAP (1:24,000). MINE OR CLAIM LIES ABOVE W. WILLOW CR. ON SE END OF BACHELOR MTN. ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Lead Primary
Gold Primary
Copper Tertiary
Manganese Tertiary

Materials information

Materials Type of material
Silver Ore
Amethyst Gangue
Barite Gangue
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Copper Staining

Analytical data

Result 2 TO 45 OZ/TON AG, $1.40/TON AU

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Campbell Mtn. Member Of Bachelor Mtn. Rhyolite;Willow Creek Member Of Bachelor Mtn. Rhyolite
    Rock description Campbell Mtn. Mbr. Of Bachelor Mtn. Rhyolite;Willow Cr. Mbr. Of Bachelor Mtn. Rhyolite
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Campbell Mtn. Member Of Bachelor Mtn. Rhyolite
    Rock description Campbell Mtn. Mbr. Of Bachelor Mtn. Rhyolite

Nearby scientific data

(1) -106.92979, 37.86723
ListMap

Geologic structures

Type Description Terms
Regional San Juan Volcanic Field; La Garita, Creede, And Bachelor Calderas
Local Creede Graben, Amethyst Fault Zone

Ore body information

  • Strike N 40-45 W
    Dip 60 TO 90 NW
    Length 73.15M

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery method Ore-Mineral In Place

Mining district

District name Creede District

Land status

Ownership category Private

Workings at the site

  • Type of workings Underground
    Length 624.84M

Comments on the workings information

  • TUNNEL TRENDS WEST AND NW APPROX. 1200 FT. DRIFT AND CROSSCUTS ALONG RHYOLITE CONTACT AND VEIN TOTAL APPROX. 850 FT.

Comments on development

  • NO WORKABLE ORE BODY ENCOUNTERED AS OF 1912

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS D007951
U.S. Bureau of Mines Minerals Availability System MAS 0080790037

Bibliographic references

  • Deposit

    EMMONS, W.H., AND LARSEN, E.S. 1923, GEOLOGY AND ORE DEPOSITS OF THE CREEDE DISTRICT, COLORADO: USGS BULL. 718, 198 P.

  • Deposit

    STEVEN, T.A., AND RATTE, J.C., 1965, GEOLOGY AND STRUCTURAL CONTROL OF ORE DEPOSITION IN THE CREEDE DISTRICT, SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 487, 90 P.

  • Deposit

    LINDEMANN, J.W., AND OTHERS, EDS., 1981, FIELD TRIP NOTES, CREEDE MINING DISTRICT, SAN JUAN VOLCANIC PROVINCE, COLORADO: DENVER REGIONAL EXPLORATION GEOLOGISTS SOC. GUIDEBOOK

General comments

Subject category Comment text
Deposit FRACTURE ZONE ALONG CONTACT BETWEEN WILLOW CR. AND CAMPBELL MTN. RHYOLITE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1981 Schwochow, Stephen D. Colorado Geological Survey