Gusty

Prospect, Active

Commodities and mineralogy

Geographic location

Quadrangle map, 1:250,000-scale CA
Quadrangle map, 1:63,360-scale B-5
Latitude 65.4434
Longitude -161.3749
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Gusty prospect is about 0.4 mile east of hill 1431 and about 4.6 miles west-northwest of the top of Granite Mountain. It is about 0.3 mile south-southwest of the center of section 33, T. 1 N., R. 13 W, The location is accurate.

Geologic setting

Geologic description

The Gutsy prospect is near the border of the mid-Cretaceous Quartz Creek pluton, a hook-shaped, quartz monzonite body at least 16 miles long and up to a mile wide. The pluton is surrounded by an alteration zone 2 to 5 miles wide that is marked by numerous mineral occurrences along the entire length of the pluton. The alteration zone extends into Jurassic-Cretaceous andesitic volcanic and sedimentary rocks around the pluton. Fine-grained dikes of varying composition cut the andesite near the pluton.
In 2005, the Linus Gold Corp. began work in the area and by 2006 had staked 176 Alaska claims that covered this prospect and others along the 'Kiwalik trend' of mineralization that roughly coincides with the Quartz Creek pluton and its alteration zone. Exposures are poor in the area and their initial work relied heavily on soil geochemistry and surface sampling. The Gutsy prospect is similar to most of the rest of the deposits along the Kiwalik trend. As described by Adams (2007), there are several types of mineralization, many occurring together: 1) sulfide-tourmaline-quartz veins with galena, sphalerite, and pyrite and locally minor arsenopyrite, pyrrhotite, chalcopyrite, and molybdenite; 2) disseminated pyrite and arsenopyrite in hairline veinlets that also locally contain sparse galena, stibnite, and bismuthinite; 3) sulfide-rich veins and veinlets with various assemblages of pyrite, pyrrhotite, chalcopyrite, arsenopyrite, sphalerite, galena, stibnite, molybdenite, and pyrargyrite, 4) pyrite-chlorite-calcite-quartz veins, 5) sulfide-quartz veins and stockworks with pyrite, pyrrhotite, arsenopyrite, galena, stibnite, sphalerite, chalcopyrite, and scheelite, and 6) fluorite-molybdenite-galena-pyrite-uranothorianite veinlets and disseminations. There are several distinct types of alteration: 1) phyllitic, 2) silicification, 3) carbonate, 4) argillic, 5) propylitic, 6) tourmalinization, 7) alunitic, and 8) potassic. Gossans with remnant galena and sphalerite are found locally.
The Gutsy prospect was discovered by Linus in 2005 (Adams, 2007). The rocks are poorly exposed at the surface, mainly as rubble, but include quartz monzonite cut by syenite and granodiorite dikes and hornfelsed mafic rocks along the contact of the quartz monzonite. A small bedrock exposure nearby in the creek consists of massive hornfelsed basalt with numerous sulfide-calcite-quartz veins. Linus drilled one hole in 2006 to a depth of 767 feet. The mineralization at the surface and in the drill hole consists of localized zones of sulfide-tourmaline-quartz veinlets, sulfide disseminations, and semi-massive sulfide veins. The top of the hole was in altered syenite, the lower portion in granodiorite dikes and hornfels. The rocks are characterized by pervasive silicification and phyllitic alteration in the syenite at the top and by propylitic alteration and silicification in the volcanic rocks at the bottom. The syenite-hosted mineralization consists of pyrite-arsenopyrite-stibnite disseminations and stockwork veinlets that form a halo around a narrow interval of pyrrhotite-tourmaline-quartz veins. Semi-massive sulfide veins and veined breccia occur in andesite and hornfels below the syenite. The massive sulfides consist of a complex intergrowth of pyrrhotite, chalcopyrite, arsenopyrite, sphalerite, argentiferous galena, and possibly pyrargyrite and stibnite. Two samples collected at the surface contained 10 and 177 parts per billion (ppb) gold, 0.2 and 24.30 parts per million (ppm) silver, 17 and more than 1,000 ppm arsenic, 1.1 and 113.50 ppm bismuth, 264.4 and 1,405 ppm copper, 26.9 and 1,800 ppm lead, 6.1 and 107 ppm antimony, 7 and 7.9 ppm tin, 4 and 2.80 ppm thorium, 1.7 and 1.00 ppm uranium, 1 and 3.50 ppm tungsten, and 115 and 2,010 ppm zinc. The best intercept in the drill hole was 40 feet that contained 84.75 ppb gold, 2.63 ppm silver, 105 ppm copper, 730 ppm lead, 190 ppm antimony, 786 ppm thorium, 3.1 ppm uranium, and 4,461 ppm zinc.
Geologic map unit (-161.37754101568, 65.4427244460014)
Mineral deposit model Disseminated and veined, Ag-As-Au-Bi-Cu-Mo-Pb-Sb-Th-U mineralization in several styles that occurs widely for 16 miles along the altered border zone of a Cretaceous quartz monzonite pluton.
Age of mineralization Cretaceous or younger based on the age of the host rocks; possibly genetically related to nearby Cretaceous plutons.
Alteration of deposit The rocks in the drill hole at the Gutsy prospect are characterized by pervasive silicification and phyllitic alteration in the syenite in the upper part of the hole and by zones of propylitic alteration and silicification in the volcanic rocks in the bottom part.

Production and reserves

Workings or exploration In 2005, the Linus Gold Corp. began work in the area and by 2006 had staked 176 Alaska claims that covered this project and others along the 'Kiwalik trend' that roughly coincides with the Quartz Creek pluton and its alteration zone. Exposures are poor in the area and their initial work relied heavily on soil geochemistry and surface sampling. In 2006, Linus drilled one hole to a depth of 767 feet on the Gutsy prospect.
Indication of production None

References

References

Adams, D.D., 2007, Geologic report on the Granite Mountain property, Koyuk Mining District, Candle B-5 and C-5 quadrangles, west-central Alaska: Unpublished Technical Report for the Linus Gold Corp., 71 p. (posted on www.sedar.com on February 8, 2008).
Reporters D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008