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

Little Emma Tunnel

Past Producer in Clear Creek county in Colorado, United States with commodities Gold, Silver, Lead, Copper, Zinc, Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Land status
  12. Production statistics
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10287132
MAS/MILS ID 0080190945
Record type Site
Current site name Little Emma Tunnel

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -105.52253, 39.76055 (WGS84)
Elevation 2682
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Clear Creek(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)

Geographic areas

Country State County
United States Colorado Clear Creek

Commodities

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

Materials information

Materials Type of material
Pyrite Ore
Chalcopyrite Ore
Galena Ore
Sphalerite Ore

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

Main Entrance (1) -105.52253, 39.76055
ListMap

Economic information

Economic information about the deposit and operations

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

Mining district

District name Central City

Land status

Ownership category Private

Production statistics

  • Year 1926
    Period 1921-1926
    Material ore
    Ore mined 55.11mt
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Zinc Zinc 1008.33mt
    Minor Lead Lead 10159.56mt
    Major Silver Silver 50263.22g
    Major Gold Gold 839.79g
  • Year 1930
    Period 1921-1930
    Material ore
    Ore mined 44.28mt
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Zinc Zinc 5%null%
    Minor Lead Lead 16%null%
    Major Silver Silver 861g/mt
    Major Gold Gold 13g/mt

Reference information

Bibliographic references

Reporter information

Type Date Name Affiliation Comment
Reporter 13-FEB-1978 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Updater 20-JUN-0007 Melton, Greg U.S. Geological Survey

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.