North Fork Group

Prospect in Carbon county in Wyoming, United States with commodities Gold, Silver, Lead, Copper, Zinc, Iron
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. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Mineral rights holdings
  16. Land status
  17. Ownership information
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10230676
MRDS ID W032144
MAS/MILS ID 560070370
Record type Site
Current site name North Fork Group
Related records 10080784

Comments on the site identification

  • Do not confuse North Fork group with North Fork Mine.
  • May contain the Pease Properties.

Geographic coordinates

Point of reference Claim
Geographic coordinates: -107.015, 41.01316 (WGS84)
Elevation 2341
Location accuracy 1000(meters)
Relative position 14 mi. S. of Battle, Probably within a mile or so. Claim block is irregularly shaped.

Site location context

Political divisions (FIPS codes)

Carbon(county)

Wyoming(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fletcher Peak(quadrangle 1:24,000 scale)

Baggs(quadrangle 1:100,000 scale)

Rawlins(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Little Snake(hydrologic unit)

White-Yampa(hydrologic accounting unit)

White-Yampa(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

Medicine Bow-Routt National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Wyoming Carbon

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 12N 86W 13 Wyoming

Commodities

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

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Silver Ore
Pyrite Ore
Chalcopyrite Ore
Limonite Ore
Malachite Ore
Azurite Ore

Analytical data

Result Galena ore ran as high as 600 opt Ag.\nOxidized ore ran 33-73 opt Au.\nAvg. ore $36.39/ton combined Au+Ag+Pb at 1905 prices.

Comments on the analytical data

  • Max. values: Ag 600 opt; Au 73 opt. Avg. workable ore: $36.39 per ton in Au, Ag, & Pb (1905 prices) (Beeler, 1905).

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Sierra Madre Granite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Rock unit name Gabbro of Elkhorn Mountain

Nearby scientific data

Claim (1) -107.015, 41.01316

Economic information

Geologic structures

Type of structure Local
Structure name dikes trend NW and dip NE, and are cut by N45W-trending qtz vein
Type of structure Regional
Structure name NE trending fault crosses the properties

Ore body information

  • Strike N45W

Comments on the geologic information

  • Granite and diorite dikes trend NW and dip NE, and are cut by N45W-trending qtz vein (North Fork vein). A N88E-trending crosscut vein cuts the N. Fork vein.
  • NE trending fault crosses the properties

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1906

Mining district

District name Encampment District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Boston Sierra Madre Mine Industry Company
  • Type Unknown
    Owner Snake River Consolidated Mining Co.

Workings at the site

  • Type of workings Underground
    Overall depth 48.76M
    Overall length 83.82M

Reference information

Bibliographic references

  • Location

    Medicine Bow National Forest, Wyoming, AML Inventory, [undated]: U.S. Bureau of Mines unpublished and undated inventory available at the USDA Forest Service office in Saratoga, WY.

  • Deposit

    Osterwald and others, 1966, Mineral Resources of Wyoming: Geological Survey of Wyoming Bull. 50 [revised ed.], p. 48, 83, 121, 126, 174, 240.

  • Deposit

    Osterwald and others, 1959, Mineral Resources of Wyoming: Geological Survey of Wyoming Bull. 50, p. 45, 77, 109, 113, 157, 219.

  • Deposit

    Hausel, 1997, Copper, lead, zinc, molybdenum, and associated metal deposits of Wyoming: Wyoming State Geological Survey Bull. 70, p. 175.

  • Deposit

    Hausel, 1986, Mineral deposits of the Encampment mining district, Sierra Madre, Wyoming-Colorado: Geological Survey of Wyoming RI-37, p. 21.

  • Deposit

    Hausel, 1989, The geology of Wyoming's precious metal lode and placer deposits: Geological Survey of Wyoming Bull. 68, p. 157.

General comments

Subject category Comment text
Deposit Vein is 6 to 26 in wide at a depth of 160 ft.; Boston Sierra Mine Industry Co. reported a 1700 ft long pay streak with a 300 ft long by 6 to 18 in wide ore shoot. Cross-cut vein is 23 ft wide and mineralized throughout much of its width.

Reporter information

Type Date Name Affiliation Comment
Reporter 1983-11-18 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Editor 2009-02-06 Wilson, Anna B. U.S. Geological Survey revised 16-oct-2012

Beyond USGS

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

External references