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Joffre Creek

Prospect in Alaska, United States with commodity Gold
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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. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308025
Record type Site
Current site name Joffre Creek

Geographic coordinates

Geographic coordinates: -156.80831, 63.40444 (WGS84)
Relative position Joffre Creek is a small, north-flowing headwater tributary to Madison Creek; it is not named on current U.S. Geological Survey topographic maps. The exact locations of prospecting and mining along Joffre Creek are not known; the coordinates are arbitrarily chosen for the approximate midpoint of the creek, in the SE 1/4 sec. 18, T. 24 S., R. 11 E., Kateel River Meridian. The location is accurate within 2 miles.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ophir B-2(quadrangle 1:63,360 scale)

Ophir SE(quadrangle 1:100,000 scale)

Ophir(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -156.80831, 63.40444
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the vicinity of the lower part of Joffre Creek are volcanic; in the upper part, they comprise chert, argillite, and volcaniclastic rocks, and a Cretaceous or Tertiary monzonite intrusive body (Chapman and others, 1987). The monzonite contains large feldspar phenocrysts and stockwork quartz veining, and is heavily weathered at the surface to quartz and feldspar (S. Dashevsky, written commun., 2000). This monzonite body is the likely source of the gold in Joffre Creek (Bundtzen and others, 1987). Harrington (1919) reports considerable prospecting along Joffre Creek (along with Madison, Esperanto, and Eldorado creeks). Also see OP007-009 and OP011-013.
  • Age = Quaternary. The source of gold in Joffre Creek is probably the Cretaceous or Tertiary monzonite pluton in its headwaters (Bundtzen and others, 1987).

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Innoko

Comments on the workings information

  • Workings / Exploration = Harrington (1919) reports considerable prospecting along Joffre Creek.

Reference information

Bibliographic references

  • Deposit

    Chapman, R.M., Patton, W.W., and Moll, E.J., 1985, Reconnaissance geologic map of the Ophir quadrangle, Alaska: U.S. Geological Survey Open-File Report 85-203, 1 sheet, 1:250,000 scale.

  • Deposit

    Bundtzen, T.K., Green, C.B., Deagen, J., and Daniels, C.L., 1987, Alaska's mineral industry, 1986: Alaska Division of Geological and Geophysical Surveys, Special Report 40, 68 p.

  • Deposit

    Harrington, G.L., 1919, The gold and platinum placers of the Tolstoi district: U.S. Geological Survey Bulletin 692-F, p. 339-351.

Comments on the references

  • Primary Reference = Harrington, 1919

General comments

Subject category Comment text
Deposit Model Name = Placer Au (Cox and Singer, 1986; model 39a)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-AUG-01 Cameron, C.E. Northern Associates Inc.

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.