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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Big Four Mine

Producer in Larimer county in Colorado, United States with commodities Gold, Silver
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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. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10013970
MRDS ID D010549
Record type Site
Current site name Big Four Mine

Geographic coordinates

Geographic coordinates: -105.20809, 40.49581 (WGS84)
Elevation 1719
Relative position 9.1 MILES S49W FROM FORT COLLINS

Site location context

Political divisions (FIPS codes)

Larimer(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Masonville(quadrangle 1:24,000 scale)

Estes Park(quadrangle 1:100,000 scale)

Greeley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Big Thompson(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Colorado Larimer

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 006N 070W 11 SW OF SW Colorado

Comments on the location information

  • ON HILLSIDE ABOVE BUCKHORN CREEK 0.6 MILE NNE FROM MASONVILLE.

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Montmorillonite Gangue

Alteration

  • (Local) Hydrothermal Montmorillonite In Fractures

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Tonalite
    Rock unit name Tonalite
    Rock description Tonalite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Tonalite
    Rock unit name Tonalite;Metasedimentary Rocks--Mica Schist
    Rock description Tonalite;Metasedimentary Rocks--Mica Schist

Nearby scientific data

(1) -105.20809, 40.49581
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Cheyenne Basin
Type of structure Local
Structure description Big Thompson Anticline, Milner Mountain Fault, Fletcher Hill (Buck Horn) Fault, Masonville Anticline, Buckhorn Syncline, Masonville Stock , Redstone Fault

Controls for ore emplacement

  • Primary Joints And Fractures In Stock

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Masonville District

Comments on the workings information

  • ONE TUNNEL DRIVEN GENERALLY NE

Reference information

Bibliographic references

  • Deposit

    WOLFE, J.A., 1953, GEOLOGY OF THE MASONVILLE MINING DISTRICT, LARIM ER COUNTY, COLORADO: COLORADO SCHOOL OF MINES M.SC. THESIS T-789.

  • Deposit

    BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE MASONVILLE QU ADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-832.

Reporter information

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

Beyond USGS

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

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.