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DGGS releases new geophysical data, maps
Alan Bailey Petroleum News
Alaska’s Division of Geological and Geophysical Services has released new airborne electromagnetic and magnetic data and maps for five areas in Alaska. The areas covered consist of a 1,447-square mile National Petroleum Reserve-Alaska tract in the north-central Brooks Range in the Howard Pass and Misheguk Mountain quadrangles; 405 square miles in the Circle quadrangle northeast of Fairbanks; 224 square miles in the east Richardson area; 67 square miles around Liscum; and 222 square miles in the Black Mountains. The east Richardson, Liscum and Black Mountains areas are in the Big Delta quadrangle.
The survey northeast of Fairbanks provides contiguous coverage between the division’s previously published Fairbanks and Circle airborne geophysical surveys. Detailed surveys Most of the surveying involved flying at 200 feet above ground level with a line spacing of one-quarter mile. Areas with tighter line spacing include the western half of the Liscum survey, which was flown with three-sixteenths-mile line spacing, and the Drenchwater Creek area in the southern NPR-A survey, which was flown with one-eighth-mile line spacing.
The detailed geophysical data obtained in the surveys shows contrasts in the magnetic and electrical properties of rock units.
Products available include 1:63,360-scale full-color maps of aeromagnetic data, 1:63,360-scale full-color apparent resistivity maps and CD ROMs containing gridded and processed data from the surveys. The maps and data provide tools for exploration for new mineral resources and could enable new interpretations of some of the existing mineralized areas. Obtain from DGGS The data were compiled and processed under contract between the division and Stevens Management Corp. Subcontractor Fugro Airborne Surveys acquired the data in 2005. The U.S. Bureau of Land Management funded the south NPR-A survey to assist in an ongoing mineral assessment. This information will aid BLM and stakeholders in developing an integrated activity plan for the southern NPR-A planning area. The State of Alaska funded the other surveys, with AngloGold Asanti (U.S.A.) Exploration Inc. partially funding the Liscum survey.
A location map and ordering information is available at www.dggs.dnr.state.ak.us/geophys.htm#geophysical_data. All of the materials are available at the cost of reproduction from DGGS, 3354 College Road, Fairbanks, AK 99709-3707, telephone (907) 451-5020, and at the Alaska Department of Natural Resources Public Information Center, 550 West 7th Ave., Suite 1260, Anchorage, AK, telephone (907) 269-8400. Mail orders should be sent to the Fairbanks DGGS office, fax (907) 451-5050.
The materials will be also available for inspection beginning Feb. 13 at the Alaska Resources Library and Information Services, 3211 Providence Drive, Anchorage, AK 99508, telephone (907) 272-7547. And beginning on Feb. 20 the materials will be available at the Historical Collection of the Alaska State Library in the State Office Building in Juneau from 1 p.m. to 5 p.m. Monday through Friday, contact Patience Frederikson at (907) 465-2927.
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