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  3. Mineral Resource Data System (MRDS)

Reger Pyrrhotite

Occurrence in Alaska, United States with commodities Copper, Nickel, Iron
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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. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307845
Record type Site
Current site name Reger Pyrrhotite

Geographic coordinates

Geographic coordinates: -154.40183, 62.15846 (WGS84)
Relative position The Reger Pyrrhotite occurrence is located on the west side of Straight Creek Valley about one kilometer southwest of the Chip Loy deposit (MG032)) at an elevation of 3,460 feet (1,055 m) in the NW1/4 sec. 22, T. 24 N., R. 28 W., of the Seward Meridian. Location is based on a description and map provided by Herreid (1968).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath A-3(quadrangle 1:63,360 scale)

McGrath SE(quadrangle 1:100,000 scale)

McGrath C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Nickel Critical Primary
Iron Secondary

Materials information

Materials Type of material
Pyrrhotite Ore
Limonite Gangue

Alteration

  • (Local) Copper bearing sulfides oxidized to azurite and malachite.

Mineral occurrence model information

Model code 10
USGS model code 5b
Deposit model name Noril'sk Cu-Ni-PGE

Nearby scientific data

(1) -154.40183, 62.15846
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Reger Pyrrhotite occurrence is in a limestone-slate thermal aureole 760 meters north of the contact of the Middle Fork Plutonic complex (Solie, 1983). A steeply dipping mafic dike of Tertiary (?) age is covered by limonite and contains abundant disseminated pyrrhotite. The sulfide-bearing dike continues upward to an elevation of at least 3,750 feet (1,143 m). Azurite and malachite staining was noted. A sample collected in the mineralized area contains 230 ppm copper and 600 ppm nickel (Herreid, 1968).
  • Age = Unknown; dike rock is undated.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Reger Pyrrhotite occurrence was found by R.D. Reger during field investigations by the Alaska Department of Natural Resources in 1967 (Herreid, 1968). A sample collected in the mineralized aureole contains 230 ppm copper and 600 ppm nickel.

Reference information

Comments on the references

  • Primary Reference = Herreid, 1968

General comments

Subject category Comment text
Deposit Model Name = Unknown--possibly disseminated Ni-Cu-PGE type (Cox and Singer, 1986; model 5b).
Deposit Other Comments = See Chip Loy deposit (MG032).

Reporter information

Type Date Name Affiliation Comment
Reporter 25-NOV-98 T.K. Bundtzen Pacific Rim Geological Consulting

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.