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North Mosquito Flats

Prospect, Active

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Commodities and mineralogy

Main commodities Ag; Cu
Other commodities Au; F; Mo; Pb; Zn

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale D-5
Latitude 63.963
Longitude -143.065
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

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 1970s and 1980s 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).
Geologic map unit (-143.067276105964, 63.9626546170619)
Alteration of deposit Argillic alteration, iron staining, and silicification are all present in the porphyritic rhyolite and the quartzite at the prospect (Doyon Ltd., 1997).

Production and reserves

Workings or 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.
Indication of production None

Additional comments

This prospect is within Doyon Ltd. selected lands. For more information, contact Doyon Ltd.

References

MRDS Number 10308374

References

Curtin, G.C., Day, G.W., Carten, R.B., Marsh, S.P., and 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, 1 sheet, scale 1:500,000.
Doyon, Limited, 1998, Veta Prospects 1997 Volume 1: Doyon, Limited, unpublished report 98-10, 256 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)
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.
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.
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, scale 1:250,000.
Reporters C.E. Cameron (ADGGS)
Last report date 4/13/1999