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

Cross

Prospect in Boulder county in Colorado, United States with commodities Gold, Silver, Tungsten
Map
XML
JSON
KML
A
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. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10190583
MRDS ID DC03261
MAS/MILS ID 80130226
Record type Site
Current site name Cross
Alternate or previous names Cross #2, Holy Cross
Related records 10017307

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -105.4767, 39.98259 (WGS84)
Elevation 2621
Location accuracy 10(meters)
Relative position 1800 ft. NE of Cold Spring mine, north side of Trevarton Gulch.

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 01S 072W 8 NW Colorado

Commodities

Commodity Importance
Gold Tertiary
Silver Tertiary
Tungsten Critical Primary

Materials information

Materials Type of material
Ferberite 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 Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Precambrian

Nearby scientific data

Main Entrance (1) -105.4767, 39.98259
ListMap

Economic information

Comments on the ore body information

  • MOST TUNGSTEN VEINS 6IN TO 3FT THICK
  • Several veins, including the Pump vein, converge to make the Cross. Hard ore. (Colo. Metal Mining Fund Board, 1960, p. 24).

Controls for ore emplacement

  • Fissures

Comments on the geologic information

  • FERBERITE ORE OCCURS ALONG A SERIES OF NE TRENDING STEEPLY-DIPPING FISSURES IN BOULDER CR. GRANITE
  • TUNGSTEN MINERALIZ. IN CHALCEDONIC QTZ VEINS OF TERTIARY AGE CUTTING PRECAMB. GRANITE AND METAMORPHIC ROCKS. MINUTE CRYS. OF FERBERITE DISSEM. THRU FINE GR. QTZ (HORN ORE), AND COARSELY CRYS. FERBERITE FORMING BRECCIA WITH COUNTRY ROCK AND EARLY QTZ VEINS (SOFT ORE)

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Metallic
Significant No

Mining district

District name Boulder Tungsten
District name Boulder County Tungsten District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Hendricks Minerals Of Canada
    Interest 100
    Year 1994
  • Type Operator
    Owner Hendricks Mining Co.
    Home office Colorado
    Year 1994
  • Type Operator
    Owner K. Horton et al
    Year 1960
  • Type Owner
    Owner Cold Spring Tungsten, Inc.
    Year 1960
  • Type Owner
    Owner Wolf Tongue Mining Co.
    Year 1953
  • Type Operator
    Owner Nelson Olsen
    Home office (Olsen operated mine during World War I)
    Year 1953

Production statistics

  • Year 1943
    Period 1907-1943
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Tungsten Tungsten 37554WO3 12wt-pct

Comments on the production information

  • BETWEEN 10,000 AND 100,000 UNITS WO3 (Sharps, 1965, p. 4)
  • Produced about 40,000 units. (whatever a "unit" is). (Colo. Metal Mining Board, 1960, p. 24)
  • "Stope fill was yielding ore in 1955." (Colo. Metal Mining Fund Board, 1960, p. 24).
  • f=From 1907-1943 produced 37,554 units of WO3 in 3,247 tons of ore that averaged 11.57% WO3. (PP-245, p. 148)

Reserves and resources

  • Type In-situ
    Estimate year 1996
    Total resources 1030000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.7 g/mt Gold Trace 1996

Comments on the workings information

  • "Shaft with 4 levels, the lowest at 359 feet. Levels are approximately 800' long. Mine timbering has been damaged by lessees." (Colo. Metal Mining Fund Board, 1960, p. 24)

Comments on development

  • DMEA APPLICATION DENIED ON GROUNDS PROPOSAL WAS TOO AMBITIOUS FOR SMALL EXPECTED ORE POTENTIAL

Reference information

Bibliographic references

  • Deposit

    Colorado Metal Mining Fund Board, 1960, Tungsten Mines of Colorado, 76 p.

  • Reserve-Resource

    RANDOL MINING DIRECTORY 1996/97, P.172.

  • Deposit

    MINE MAP REPO # 402532,402554 405887,402554

  • Deposit

    Lovering and Goddard, 1950, USGS PROF PAPER 223 PL 3 (north)

  • Deposit

    THE NORTHERN MINER, V79 N45, 1-10-94, P.14.

  • Deposit

    THE MINING RECORD, V105 N12, 3-23-94, P.1.

  • Deposit

    THE MINING RECORD, V105 N21, 5-25-94, P.1.

  • Deposit

    Vanderwilt, 1947, Mineral Resources of Colorado: Mineral Resources Board, 547 p.

  • Deposit

    Sharps, 1965, tungsten in Colorado: COLO SCH MINES MIN IND BULL., v. 8, no. 5, 16 p.

  • Deposit

    DMEA RECORDS (deleted record 10017307 =oldMRDS DC03261)

  • Deposit

    Lovering, T.S., and Tweto, Ogden, 1953, Geology and ore deposits of the Boulder County Tungsten District, Colorado: USGS Prof. Paper 245, p.

  • Deposit

    U.S. Bureau of Mines, 1945, Boulder County Tungsten District, Boulder County, Colorado: U.S. Bureau of Mines War Minerals Report No. 404, 22 p.

Reporter information

Type Date Name Affiliation Comment
Reporter 1997-02-07 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Editor 2013-12-11 Wilson, Anna B U.S. Geological Survey merged and deleted duplicate records. Disambiguated other mines with Cross in the name.
Reporter 1973-03-01 Conservation Division Files U.S. Geological Survey MRDS DC03261 = 10017307
Editor 2007-05-24 Melton, Greg U.S. Geological Survey revised now deleted record DC03261 = 10017307.

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.