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Eureka Mine

Past Producer in Boulder county in Colorado, United States with commodity Tungsten
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10091302
MRDS ID DC03425
MAS/MILS ID 80130292
Record type Site
Current site name Eureka Mine
Alternate or previous names Eureka, Eureka Tungsten Mining Company - Midway Tunnel
Related records 10262871

Comments on the site names

  • Tip Top (aka Upper Eureka) Tunnel is a few hundred feed NE of the Tip Top Claim. (PP-245, p. 167)

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -105.41278, 39.99956 (WGS84)
Location accuracy 10(meters)
Relative position Adit shown and labeled on topo. Midway tunnel is 1200 ft. east of the Eureka (see PP-245, p. 167) Thre is another tunnel 1,000 ft SW of the Eureka tunnel and aobut 565 ft higher called the Upper Eureka or Tip Top.

Site location context

Political divisions (FIPS codes)

Boulder(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tungsten(quadrangle 1:24,000 scale)

Denver West(quadrangle 1:100,000 scale)

Denver(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

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 01N 72W 35 NW4 of SE4 of SE4 Colorado

Comments on the location information

  • Mine is on the west (north) side of Middle Boulder Creek and Hwy 110, due E of Comforter Mth. It is at the Narrows, about 2,500 ft. SW of Boulder Fall.s

Commodities

Commodity Importance
Tungsten Critical Primary

Materials information

Materials Type of material
Ferberite Ore
Scheelite Ore

Mineral occurrence model information

Model code 46
USGS model code 15a
Deposit model name W veins

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

Main Entrance (1) -105.41278, 39.99956
ListMap

Economic information

Comments on the geologic information

  • FERBERITE VEINS IN GNEISSIC GRANITE

Economic information about the deposit and operations

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

Mining district

District name Boulder Tungsten District
District name Sugar Loaf Mining District

Ownership information

  • Type Owner
    Owner Eureka Tungsten Co. (Ben Newmann and associates)
    Year 1953
    First year 1936
    Last year 1944
  • Type Owner
    Owner Gold, Silver & Tungsten, Inc.
    Year 1953
  • Type Operator
    Owner Wilson and Adams
    Year 1953
    First year 1916
    Last year 1918
  • Type Operator
    Owner Miller & Co. and Gilbert & Co.
    Year 1953
    First year 1927
    Last year 1931
  • Type Operator
    Owner Eureka Tungsten Co. Elliot Ralston, manager
    Year 1960

Production statistics

  • Year 1918
    Period 1916-1918
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Tungsten Tungsten 17

Comments on the production information

  • PRODUCED BETWEEN 10,000 AND 100,000 UNITS WO3 (Sharps, 1965, p. 4; PP-245, p. 167)

Reference information

Bibliographic references

  • Deposit

    DMEA RECORDS, Docket DMA-1567 (not 1557, as stated in merged and deleted record 10262929)

  • Location

    USGS GOLD HILL TOPO QUAD, 1957, 7 1/2 MIN

  • Deposit

    MINE MAP REPO[sitory] # 401226

  • Deposit

    BLM COLO. CONNECTING SHEETS

  • Deposit

    CONSV. DIV. COMP. DATE, 1,62

  • Deposit

    Sharps, T.I., 1965, Tungsten in Colorado: Colorado School of Mines Mineral Industries Bulletin, v. 8, no. 5, 16 p.

  • Deposit

    Vanderwilt, 1947, p. 320, #25, pl. 17.

  • Deposit

    Lovering and Goddard, 1950, USGS Prof. Paper 223, pl. 3.

  • Deposit

    Lovering and Tweto, 1953, USGS Prof. Paper 245.

  • Deposit

    Colorado Metal Mining Fund Board, 1960, Tungsten Mines of Colorado.

Reporter information

Type Date Name Affiliation Comment
Updater 1974-01-01 Unknown U.S. Geological Survey
Editor 2007-05-22 Melton, Greg U.S. Geological Survey also DC000095 = 10108019, D003243 = 10107902
Editor 2013-12-23 Wilson, Anna B U.S. Geological Survey merged and deleted multiple records. (Greg Melton had previously also consolidated some records). Disambiguated with the Eureka (gold) mine farther north, also in Boulder County.
Reporter 1972-07-01 Conservation Division Files U.S. Geological Survey DC000095 = 10108019
Reporter 1983-11-17 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines MAS 0080130292 = 10262929
Reporter 1973-03-01 Conservation Division Files U.S. Geological Survey
Reporter 1975-04-01 Hasler, J. William U.S. Geological Survey D003243 = 10107902

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.