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

Big Horn Shaft

Past Producer in Boulder county in Colorado, United States with commodity Molybdenum
Map
XML
JSON
KML
C
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10107628
MRDS ID D000399
Record type Site
Current site name Big Horn Shaft
Alternate or previous names Caribou
Related records 10214731

Geographic coordinates

Geographic coordinates: -105.56448, 40.00082 (WGS84)

Site location context

Political divisions (FIPS codes)

Boulder(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ward(quadrangle 1:24,000 scale)

Estes Park(quadrangle 1:100,000 scale)

Greeley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

St. Vrain(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 Boulder

Commodities

Commodity Importance
Molybdenum Primary

Comments on the commodity information

  • ORIGINALLY LOCATED FOR GOLD. TUNGSTEN FIRST PRODUCED IN 1908

Materials information

Materials Type of material
Molybdenite Ore

Analytical data

Result AVERAGE GRADE MOS2 - 0.5 - 0.75%

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist

Nearby scientific data

(1) -105.56448, 40.00082
ListMap

Economic information

Comments on the geologic information

  • IN THE PURE GOLD AND MORNING STAR MINES THE MINERALIZATION IS CLOSELY RELATED TO MOGUL FAULT AND SUBSIDIARY FAULTS WHICH STRIKE NORTHWEST, DIP SOUTHERLY, AND SEPARATE PRE-CAMBRIAN GRANITE ON THE NORTH FROM APACHE AND PALEOZOIC SEDIMENTARY ROCKS ON THE SOUTH. THE FAULT EXTENDS FOR 10 MI. ALONG THE NORTH END OF THE RANGE AND APPEARS TO WARRANT MORE EXTENSIVE EXPLORATION FOR TUNGSTEN ORE BODIES.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No

Comments on the production information

  • ITEM 8 IS THE TOTAL OUTPUT OF THREE MINES: THE BONITA MINE (LATER KNOWN AS THE MAUDINA), MORNING STAR, AND PURE GOLD.

Reference information

Bibliographic references

  • Deposit

    WORCESTER, 1919, MOLYBDENUM DEPOSITS OF COLO.: COLO. GS BULL. 14

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1974 King, Robert U. U.S. Geological Survey
Updater 25-MAY-0007 Melton, Greg U.S. 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.