North Mosquito Flats

Prospect in Alaska, United States with commodities Silver, Copper, Gold, Fluorine-Fluorite, Molybdenum, Lead, Zinc

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.
(click for info)

Geographic areas

Country State
United States Alaska


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


  • (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) -143.06771, 63.96273

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF TC019

Bibliographic references

  • Deposit

    Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-593, 1 sheet, scale 1:250,000.

  • Deposit

    Curtin, G.C., Day, G.W., O'Leary, R.M., Marsh, S.P., Tripp, R.B.,1976, Geochemical maps showing the distribution and abundance of molybdenum in the Tanacross Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-0767-G.

  • Deposit

    Foster, H.L., Albert, N.R.D., Barnes, D.F., Curtin, G.C., Griscom, Andrew, Singer, D.A., and Smith, J.G., 1976, The Alaskan Mineral Resources Assessment Program: Background information to accompany folio of geologic and mineral resource maps of the Tanacross quadrangle, Alaska: U.S. Geological Survey Circular 734, 23 p.

  • Deposit

    U.S. Geological Survey, 1976, Aeromagnetic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-767-A, 2 sheets.

  • Deposit

    Doyon, Limited, 1998, Veta Prospects 1997 Volume 1: Fairbanks, Alaska, Doyon, Limited., unpublished report 98-10, 256 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)

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