South Fox

Prospect, Active

Commodities and mineralogy

Main commodities Au
Other commodities Ag; As; Hg; Sb
Ore minerals arsenopyrite; gold; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TE
Quadrangle map, 1:63,360-scale D-2
Latitude 65.7864
Longitude -165.9999
Nearby scientific data Find additional scientific data near this location
Location and accuracy The South Fox prospect is about 11.9 miles southeast of Ear Mountain. It is centered about 0.5 mile west of hill 1180 and about 0.6 mile southwest of the center of section 35, T. 5 N., R. 35 W. The location is accurate.

Geologic setting

Geologic description

The South Fox prospect is in mica-quartz schist and graphitic quartz schist intercalated in a metasedimentary sequence that includes schistose, micaceous, dolomitic marble; mica-calcite schist; and minor micaceous quartzite (Cedar Mountain, 2011 [project]). The sequence is interpreted as a limestone-shale assemblage with facies variations. It is highly deformed and perhaps isoclinally folded. Schistosity dips moderately in various directions. Steeply-dipping marble-schist contacts and other strong linear features may indicate normal faults. The South Fox prospect is along a northwest-trending, regional fault that marks the contact between schist to the southwest and marble to the northeast. All of the metavolcanic and metasedimentary rocks in area were probably Paleozoic originally and have probably been metamorphosed in the Cretaceous; Sainsbury (1972) however mapped them as Precambrian.
The South Fox prospect is one of several similar deposits that define a district-level, west-northwest trending belt of gold mineralization about 11 miles long and 2 miles wide. The best known and most extensively explored of these is the Kelly Creek prospect (TE069) about a half mile to the north; other are the North Fox (TE109), Wolf (TE107), Wolverine (TE110), Moose (TE111), and Jaeger (TE112) prospects.
The prospect was discovered by following up gold and arsenic anomalies in soils and stream sediments collected in the west headwaters of Kelly Creek (Hudson and Wyman, 1983; Hudson, 1984; Cedar Mountain, 2011 [assay]) The gold, arsenic, and antimony values define strong, coherent, multi-element anomalies. Mercury is commonly elevated in the soils, but its distribution and concentration are more erratic and it is more widely dispersed at anomalous levels than the other three elements. Rock samples from frost boils show that the stronger anomalies are associated with silicified breccia and quartz-stockworks in sooty, black carbonaceous quartz schist.
Clay is locally present in fractures and as part of the matrix in breccia. Dolomite and calcite reportedly accompany quartz in the veins in some drill core (Marrs and Ivey, 1984). Pyrite is disseminated in pelitic schist and is present in all mineralized rocks; in part, it is probably of sedimentary origin. Quartz segregations along the foliation in pelitic schist are recrystallized, sugary textured, and vuggy in mineralized rocks.
Cedar Mountain Exploration Inc. acquired the property in March 2010 and began aggressive exploration (Cedar Mountain Exploration Inc., 2011 [Kelly Creek]). In 2011, Cedar Mountain drilled 10 holes that totaled 1,102 meters (Cedar Mountain Exploration, 2011 [November 18]). Four holes in the northern part of the prospect cut significant intervals with gold values along a strike length of about 250 meters. The best intercepts were 0.45 gram of gold per ton along 28.40 meters and 0.76 gram of gold per tonne along 24.00 meters. The mineralization is associated with faulted and sheared quartz-veinlets and stockworks in mica-quartz schist and calcareous, graphite-quartz schist. The other holes in the south portion of the prospect did not cut significant mineralization, possibly due to faulting that offset the mineralized zone.
Geologic map unit (-166.002631960104, 65.7856598799377)
Mineral deposit model Disseminated and stockwork quartz and gold mineralization in metapelitic rocks. Possibly carbonate-hosted Au-Ag and/or low sulfide Au-quartz vein (Cox and Singer, 1986; models 26a or 36a).
Mineral deposit model number 26a or 36a?
Age of mineralization Unknown but probably mid-to Late Cretaceous as the mineralization postdates regional metamorphism.
Alteration of deposit Brecciation, silicification, and quartz stockwork veining is common in pelitic schist. Some quartz veins contain carbonate minerals. Clay and limonite are present in some mineralized rocks.

Production and reserves

Workings or exploration
The prospect was discovered by following up gold and arsenic anomalies in soils and stream sediments collected in the west headwaters of Kelly Creek (Hudson and Wyman, 1983; Hudson, 1984; Cedar Mountain, 2011 [assay]). Cedar Mountain Exploration Inc. acquired the property in March 2010 and began aggressive exploration (Cedar Mountain Exploration Inc., 2011 [Kelly Creek]). In 2011, Cedar Mountain drilled 10 holes that totaled 1,102 meters
Four holes in the northern part of the prospect cut significant intervals with gold values along a strike length of about 250 meters. The other six holes in the south portion of the prospect did not cut significant mineralization.
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Cedar Mountain Exploration, 2011, Cedar identified new gold targets at Kelly Creek project: http://www.cedarmountainexp.com/news/index.php?&content_id=86 (News Release, November 18, 2011).
Cedar Mountain Exploration, 2011, Drilling confirms bedrock gold source at Kelly Creek project: http://cedarmountainexp.com/news/news_archive/index.php?&content_id=85 (News release, November 2, 2011).
Cedar Mountain Exploration Inc., 2011, Kelly Creek project: http://www.cedarmountainexp.com/projects/alaska/kelly_creek_project/ (as of Feb. 10, 2011).
Cedar Mountain Exploration Inc., 2011, New assay date upgrades Cedar Mountain's Kelly Creek Project: http://www.cedarmountainexp.com/_resources/CED_2011_01_25.pdf (News release, January 25, 2011).
Hudson, T.L., 1984, 1983 Seward Peninsula reconnaissance project: Anchorage, Alaska, Anaconda Minerals Company internal report (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).
Hudson, T.L., and Wyman, W. F., 1983, Interim report on areas of Seward Peninsula warranting further prospecting and evaluation: Anchorage, Anaconda Minerals Company internal report, 84 p., 7 plates. (Report held by Cook Inlet Region Inc., Anchorage, Alaska.)
Marrs, C.D., and Ivey, J.A., 1984, 1984 Prospect evaluation project; Kelly Creek (Fox claims): Anchorage, Alaska, Anaconda Minerals Company internal report. (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012