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Homebuilder

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. 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 10000961
MRDS ID A011631
Record type Site
Current site name Homebuilder
Alternate or previous names McCoy, Babcock-McCoy, Idamar

Geographic coordinates

Geographic coordinates: -149.20269, 61.81956 (WGS84)
Relative position West of Reed Creek, 1,600 ft west of the confluence of Goodhope Creek with Reed Creek. Accurate within 2,000 ft. Locality 31 on plate VI of Chapin (1920), locality 29 of Cobb (1972), and location 20 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-6(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

Materials information

Materials Type of material
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) -149.20269, 61.81956
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Quartz vein 5 to 9 ft wide cuts intrusive rocks near the contact of the Willow Creek Pluton and early Paleocene to Late Cretaceous tonalite. Vein orientation given as striking NW and dipping SW (Capps, 1915) and N 70 E/35 NW (Brooks, 1925). The quartz vein contains gold (which can be panned) and considerable pyrite (Brooks, 1925). ? the Late Cretaceous 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. The younger intrusive body includes biotite-hornblende tonalite and lesser biotite-hornblende quartz diorite. 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 = At least Late Cretaceous or younger - possibly Paleocene or younger; vein cuts rocks near the contact of the Late Cretaceous Willow Creek Pluton and an early Paleocene to Late Cretaceous tonalite.

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 workings information

  • Workings / Exploration = Staked by Fred McCoy in 1913 (Stoll, 1997). By 1915, veins were prospected by numerous open cuts, only some of which reached undisturbed bedrock (Capps, 1915). Capps (1919) reported a crosscut being driven in 1917 to undercut the gold-bearing quartz vein. In 1919, J.B. Larsen staked the Idamar claims, and began minor surface stripping (Chapin, 1921). By 1925, the crosscut was being driven to intersect the vein 300 ft below the surface workings.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Brooks, 1925

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Deposit Other Comments = Capps (1917) refers to this prospect as McCoy or Babcock-McCoy claim, Chapin (1921) refers to it as Idamar, and Brooks (1925) calls it Homebuilder. Possibly these are three separate prospects, but all are in close proximity.

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.

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.