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  3. Mineral Resource Data System (MRDS)

North Mosquito Flats

Prospect in Alaska, United States with commodities Silver, Copper, Gold, Fluorine-Fluorite, Molybdenum, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mining district
  10. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10308374
Record type Site
Current site name North Mosquito Flats

Geographic coordinates

Geographic coordinates: -143.06771, 63.96273 (WGS84)
Relative position The North Mosquito Flats prospect covers an area of about 6 square miles. The coordinates correspond to the center of the property. The prospect is in sections 5, 7-10, T. 25 N., R. 12 E., of the Copper River Meridian. It is 25 miles west of the Taylor Highway, on the north side of Mosquito Flats. An overgrown bulldozer trail crosses the prospect. The location is accurate.

Site location context

Political divisions (FIPS codes)

Southeast Fairbanks(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tanacross D-5(quadrangle 1:63,360 scale)

Tanacross NW(quadrangle 1:100,000 scale)

Tanacross(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Gold Secondary
Fluorine-Fluorite Critical Secondary
Molybdenum Secondary
Lead Secondary
Zinc Critical Secondary

Alteration

  • (Local) Argillic alteration, iron staining, and silicification are all present in the porphyritic rhyolite and the quartzite at the prospect (Doyon Ltd., 1997).

Nearby scientific data

(1) Jg
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The geology in the North Mosquito Flats prospect area includes quartzite on the west ridge of the prospect, and altered granodiorite on the east ridge. Porphyritic rhyolite is also found (Doyon Ltd., 1998). The bedrock is Paleozoic schist and quartzite intruded by Mesozoic quartz monzonite and granodiorite (Foster, 1970). Argillic alteration, iron staining, and silicification are present. North Mosquito Flats first received attention in the 1970's and 1980's when USGS geochemical studies discovered lead, molybdenum, and zinc anomalies in silt in the northern drainages to Mosquito Flats (Curtin and others, 1976). Subsequent stream sediment samples were anomalous in gold. Traverses down-ridge found high gold values between the two ridges on the property. Soils collected in 1981 show anomalies in copper and fluorine (Doyon Ltd., 1998).

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Fortymile

Comments on the workings information

  • Workings / Exploration = In 1976, the USGS conducted a mineral resource appraisal and an aeromagnetic reconnaissance of the area (Curtin and others, 1976; U.S. Geological Survey, 1976). In recent years, soil and rock sampling has been conducted on the property.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Doyon Ltd., 1998

General comments

Subject category Comment text
Deposit Other Comments = This prospect is within Doyon Ltd. selected lands. For more information, contact Doyon Ltd.

Reporter information

Type Date Name Affiliation Comment
Reporter 13-APR-99 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys

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.