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Kelly-Willow

Prospect in Alaska, United States with commodities Gold, Lead
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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 10093994
MRDS ID A011609
Record type Site
Current site name Kelly-Willow
Alternate or previous names Gold Center, Brooklyn Development Co., Brooklyn-Willow Creek Gold Mining Co.
Related records 10258331

Geographic coordinates

Geographic coordinates: -149.30879, 61.78345 (WGS84)
Relative position Near headwaters of Upper Willow Creek. Marked with adit symbol on the Anchorage D-7 1:63,360-scale topographic map, and labeled 'Kelly-Willow Prospect'. Accurate within 100 ft. Locality 11 from Cobb (1972) and locality 9 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage D-7(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Susitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Lead Secondary

Materials information

Materials Type of material
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

Mineral occurrence model information

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

Nearby scientific data

(1) -149.30879, 61.78345
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = One 4-foot-wide vein having three different stringers each about 6 inches thick cuts quartz diorite of the Late Cretaceous Willow Creek Pluton. Veins have a general strike of N 23 W, and dip of 35 SW (Capps, 1919). Assays of a narrow quartz stringer showed 1.25 oz/ton Au, while assays over full the width of vein were very low (Ray, 1954). Owners reported five mineralized veins on the property. One mineralized vein is probably the Independence vein; projection of the vein to the surface would be on patented claims of the Independence mine (ARDF number AN001).? the Willow Creek Pluton is a zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite. Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).
  • Age = Late Cretaceous or younger; veins cut the Late Cretaceous Willow Creek Pluton.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the production information

  • Production Notes = Undetermined production, data in the literature is confusing. A Chilean mill was freighted at least part way to the prospect in 1914, but was not installed (Capps, 1915). Information may be confused with neighboring properties which, at times, were under the same ownership (Cobb, 1979). There may have been production, as the mine map shows a stoped area.

Comments on the workings information

  • Workings / Exploration = Located around 1909. Developed sporatically by open cuts and possibly as much as 1,000 feet of underground workings mainly along barren shear zones, from about 1909 to 1948. Exploration occured via four tunnels and inclined shaft. The mill on the property may never have been used but the mine map shows stoped area. Assays of narrow quartz stringer showed 1.25 oz/ton Au, while assays over full width of vein were very low (Ray, 1954).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Ray, 1954

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Deposit Other Comments = the information on this site is inconsistent due to changing ownership and consolidation of many properties under same name.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey

Beyond USGS

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

External references

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.