Jaeger

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 65.7575
Longitude -165.6564
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Jaeger prospect is about 19.9 miles southeast of Ear Mountain. It is about 1.0 mile south of hill 1370, near elevation 1030, and about 0.5 mile south-southwest of the center of section 12, T. 4 N., R. 34 W. The location is accurate.

Geologic setting

Geologic description

The Jaeger 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. 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 Jaeger 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 5.5 miles to the west; other are the South Fox (TE108), North Fox (TE109), Wolf (TE107), Wolverine (TE110), and Moose (TE111) prospects.
The prospect was discovered by following up gold and arsenic anomalies in soils and stream sediments (Hudson and Wyman, 1983; Hudson, 1984; Cedar Mountain, 2011 [assay]; Cedar Mountain, 2011 [November 2]). 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]). Reconnaissance samples collected in 2007 contained some anomalous gold; soil sampling in 2010 and 2011 defined an area anomalous in gold about 600 meters long. The rocks in the anomalous area are black, fine-grained carbonaceous schist and mica-quartz schist; the rocks and structural setting are similar to and may be a continuation of those seen in drill holes at the Moose prospect (TE111) about 1.5 miles to the northwest and the Wolverine prospect (TE110) about 3.8 miles to the northwest.
Geologic map unit (-165.659120183276, 65.7567688367799)
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 Jaeger prospect was discovered by following up gold and arsenic anomalies in soils and stream sediments (Hudson and Wyman, 1983; Hudson, 1984; Cedar Mountain, 2011 [assay]; Cedar Mountain, 2011 [November 2]. Cedar Mountain Exploration Inc. acquired the property in March 2010 and began aggressive exploration (Cedar Mountain Exploration Inc., 2011 [Kelly Creek]). The work on the Moose prospect is confined to limited surface sampling and a gridded geochemical survey.
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://www.cedarmountainexp.com/news/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