Windy Creek (Windy Creek-Rosa Creek)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Zn
Other commodities Pb
Ore minerals pyrite; unknown zinc and lead mineral(s)

Geographic location

Quadrangle map, 1:250,000-scale TN
Quadrangle map, 1:63,360-scale B-3
Latitude 65.31286
Longitude -151.2032
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents an area of prospecting for lode deposits in the headwaters of Windy Creek. The site is at an elevation of 1,500 feet on Windy Creek, in the south half of section 26, T. 6 N., R. 18 W., of the Fairbanks Meridian. The location is accurate within 0.5 mile.

Geologic setting

Geologic description

The bedrock across which Windy Creek flows consists of Paleozoic limestone-dolomite, greenstone, chlorite schist, phyllite, quartz-mica schist, and chert (Chapman and others, 1982). The closest granitic pluton, a Tertiary quartz monzonite stock (radiometric age of 61.8 +/- 2.5 Ma), is about 1 mile to the east (Silberman and others, 1979). A small-scale map by North Star Exploration, Inc. (North Star Exploration Inc., 2000 [Windy Creek zinc prospect]) shows the local geology as folded quartz mica schist and carbonate near a Cretaceous granite body, with all units cut by northeast- and northwest-trending faults.
There is no record of placer mining on this creek. In recent years, Doyon, Ltd., has employed several different exploration companies to examine Doyon block 20 for precious and base metals (Placer Dome, 1989; North Star Exploration, Inc., 1999 [Report 99-34]; also see ARDF record TN035). WGM, Inc., and Union Carbide Corporation respectively explored the block from 1975 to 1979 and in 1982. Placer Dome had a joint venture with Doyon, Ltd., in 1988-89, and North Star Exploration, Inc., explored Doyon block 20 from 1997 to 2000.
WGM, Inc., identified zinc-in-soil geochemical anomalies in the Windy Creek area in 1977 (North Star Exploration Inc., 2000 [Windy Creek zinc prospect]). The area of the anomalies extends more than 8,000 feet in a north-northeast direction and reaches a maximum width of 700 feet. Exposed mineralization is zinc-dominant. Channel samples of mineralized carbonate breccia at a few localities assayed 5.5 percent zinc and 0.07 percent lead over a width of 7 feet. Float samples of massive pyrite and high-grade zinc ore are common in the area (North Star Exploration Inc., 2000 [Highly mineralized block 20]). A float boulder from the flank of Senatis Mountain assayed 10.3 percent zinc and 0.02 percent lead.
North Star Exploration, Inc., began exploration at Windy Creek in the late 1990s. In 1997, the company contracted for a proprietary airborne geophysical survey with a line spacing of 400 feet, and acquired detailed magnetic, radiometric, and electromagnetic data. These data, especially the flightline profiles, allowed detailed interpretations of the configuration of the mineralized zone (North Star Exploration, Inc., 2000 [Windy Creek zinc prospect]).
In 1999, North Star extended the WGM geochemical anomaly at Windy Creek with additional soil sampling. The anomalous zone was extended to almost 5 miles in length, and remains open along strike in both directions. Two new areas of bedrock zinc mineralization were discovered: a carbonate breccia with assays of up to 3.6 percent zinc and 0.2 percent lead, and a gossanous area with sample assays of up to 3.18 percent zinc (North Star Exploration, Inc., 2000 [Windy Creek zinc prospect]).
North Star Exploration, Inc. (North Star Exploration Inc., 2000 [Windy Creek zinc prospect]) interprets the Windy Creek prospect as a zinc-rich, dolomitic carbonate replacement deposit, or possibly a zinc skarn. The company asserts that the prospect is ready to be drill-tested.
Geologic map unit (-151.205714174272, 65.312358936856)
Mineral deposit model Zinc skarn? (Cox and Singer, 1986; model 18c) or Zinc replacement body? (Cox and Singer, 1986; model 19a).
Mineral deposit model number 18c? or 19a?
Age of mineralization Thought to be Tertiary based on proximity to a Tertiary quartz monzonite stock (radiometric age of 61.8 +/- 2.5 Ma).

Production and reserves

Workings or exploration
WGM, Inc., identified zinc-in-soil geochemical anomalies in the Windy Creek area in 1977 (North Star Exploration Inc., 2000 [Windy Creek zinc prospect]). The area of the anomalies extends more than 8,000 feet in a north-northeast direction and reaches a maximum width of 700 feet. Exposed mineralization is zinc-dominant. Channel samples of mineralized carbonate breccia at a few localities assayed 5.5 percent zinc and 0.07 percent lead over a width of 7 feet. Float samples of massive pyrite and high-grade zinc ore are common in the area (North Star Exploration Inc., 2000 [Highly mineralized block 20]). A float boulder from the flank of Senatis Mountain assayed 10.3 percent zinc and 0.02 percent lead.
North Star Exploration, Inc., began exploration at Windy Creek in the late 1990s. In 1997, the company contracted for a proprietary airborne geophysical survey with a line spacing of 400 feet, and acquired detailed magnetic, radiometric, and electromagnetic data. These data, especially the flightline profiles, allowed detailed interpretations of the configuration of the mineralized zone (North Star Exploration, Inc., 2000 [Windy Creek zinc prospect]).
In 1999, North Star extended the WGM geochemical anomaly at Windy Creek with additional soil sampling. The anomalous zone was extended to almost 5 miles in length, and remains open along strike in both directions. Two new areas of bedrock zinc mineralization were discovered: a carbonate breccia with assays of up to 3.6 percent zinc and 0.2 percent lead, and a gossaneous area with sample assays of up to 3.18 percent zinc (North Star Exploration, Inc., 2000 [Windy Creek zinc prospect]).
Indication of production None

Additional comments

This site is on land selected by or conveyed to Doyon, Ltd. For further information, contact Doyon, Ltd., at 1 Doyon Place, Suite 300, Fairbanks, Alaska, 99701-2941.

References

References

North Star Exploration, Inc., 1999, Doyon, Ltd., Report 99-34: Unpublished report held by Doyon, Ltd., Fairbanks, Alaska.
North Star Exploration, Inc., 2000, Doyon, Ltd., Report 2000-17: Unpublished report held by Doyon, Ltd., Fairbanks, Alaska.
North Star Exploration, Inc., 2000, The highly mineralized block 20 a multi-target, multi-commodity opportunity: unpublished company brochure, 4 p.
North Star Exploration, Inc., 2000, The Windy Creek zinc prospect: a drill-ready carbonate replacement target: unpublished company brochure, 4 p, 3 small-scale maps.
Placer Dome, 1989, Doyon, Ltd., Report 89-11: Unpublished report held by Doyon, Ltd., Fairbanks, Alaska.
Reporters G.E. Graham (ADGGS), D.J. Szumigala (ADGGS)
Last report date 6/25/2003