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

Big Bertha

Past Producer in Gilpin county in Colorado, United States with commodity Uranium
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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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10264181
MAS/MILS ID 0080470040
Record type Site
Current site name Big Bertha

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -105.58499, 39.84309 (WGS84)

Site location context

Political divisions (FIPS codes)

Gilpin(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Central City(quadrangle 1:24,000 scale)

Denver West(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Clear(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Arapaho and Roosevelt National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Gilpin

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 002 S 073 W 29 Colorado

Commodities

Commodity Importance
Uranium Tertiary

Materials information

Materials Type of material
Chalcopyrite Unknown
Galena Unknown
Pyrite Unknown

Nearby scientific data

Ore Body (1) -105.58499, 39.84309
ListMap

Economic information

Ore body information

  • Field Value
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 IRREGULAR
    Shape of Orebody #2 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control IGNEOUS
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SILICIFICATION
    Type of Wallrock Alter. #2 PYRITIZATION
    Date of Last Modification 780213

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No

Mining district

District name Michigan Hill

Land status

Ownership category National Forest

Reference information

Bibliographic references

  • Deposit

    REF:MAS FILE

General comments

Subject category Comment text
Deposit INFORMATION FROM PRR-1857, DATED 1952. RADIOACTIVITY: AVERAGE TO 10 TIMES BG. MINE WORKINGS: ADIT, PORTAL CAVED. MINERALIZ OCCURS AS LENTICLES, DISSEMINATED GRAINS AND VEINLETS. THE A COVERED BY THE 7-1/2 MINUTE USGS MAP, CENTRAL CITY.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Minecom U.S. Bureau of Mines

Beyond USGS

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

External references

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.