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New Geophysical Maps and Date Available for Kuskokwim Area

State of Alaska Department of Natural Resources- Division of Geological & Geophysical Surveys

New geophysical maps and data available for Kuskokwim Area

(Fairbanks, AK) – The Division of Geological & Geophysical Surveys today is releasing 1,029 square miles of airborne-geophysical survey data and maps for three surveys mainly in the Iditarod Quadrangle, with small areas in the Ophir and Holy Cross quadrangles. The new surveys, Southern Dishna River, Fox Hills, and Beaver Creek, are adjacent to previous airborne-geophysical Iditarod and Aniak surveys. The center of the new survey areas is about 270 miles northwest of Anchorage and 60 miles west–southwest of McGrath. The new surveys are in the Innoko, Iditarod, and Aniak mining districts.

The new Kuskokwim area survey data is expected to be useful for resource exploration, planning, and public land-use management. Airborne geophysics helps to characterize bedrock types, project geology between sparse outcrops, and identify vegetation-covered anomalous geologic signatures that might be associated with lode mineralization.

Miners in the Iditarod, Innoko, and Aniak mining districts have produced more than 2.8 million troy ounces of gold since recordkeeping began in 1880. Only 3,000 ounces of this production was from lode (hard rock) sources. Most placer-producing creeks in the area are headed by igneous rocks, suggesting strongly that lode gold sources are present. Much of the area is covered by surface deposits and vegetation and has not been explored thoroughly. The survey areas contain prospects representing several different mineral deposit types, including plutonic-related gold deposits and mesothermal and epithermal deposits that contain mercury, tungsten, silver, antimony, and tin.

Funding for the surveys was provided by the Alaska Legislature through the division’s Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.

The aeromagnetic and electromagnetic geophysical survey data will be released in DVD and paper formats at 1 p.m. on Thursday, Nov. 7, at the DGGS office, 3354 College Road in Fairbanks, Alaska 99709-3707. Also at 1 p.m., digital files of the data and maps will be available at no cost on the division’s website at www.dggs.alaska.gov. The data and maps can be found through links provided on the order forms on the website. Electromagnetic-anomaly maps and an interpretive project report will be available at a later date.

DVDs and the individual map sheets are available for the cost of reproduction and can be inspected and purchased at the DGGS office. Call 907-451-5020 to place phone orders. Mail orders should be sent to the DGGS office at the above address or via fax (907-451-5050) or e-mail (dggspubs@alaska.gov). Location maps and order forms are available on the DGGS website:

Order form for all three surveys: http://www.dggs.alaska.gov/pubs/project-orderform/1187

These materials also will be available for inspection beginning Nov. 27 at the Alaska Resources Library and Information Services (ARLIS), located at 3211 Providence Drive, Anchorage, AK 99508 (907-272-7547), and at the Historical Collection of the Alaska State Library, located in the State Office Building in Juneau (open 1-5 p.m. Monday through Friday; 907-465-2927).

dnr.alaska.gov

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