Moose Jaw Prospect, Innoko District, Yukon-Koyukuk Borough, Alaska, USA

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For more information, contact Ron Rosander in McGrath, AK.
Location: The Moose Jaw prospect is located on the east side of Eldorado Creek near the headwaters of Colorado Creek. The prospect is at an elevation of about 2000 feet, in the NE1/4 of sec. 32, T. 22 S., R. 15 E., Kateel River Meridian. The location is accurate.
Geology: Bedrock in the vicinity of the Moose Jaw prospect consists of intermediate to mafic volcanic and volcaniclastic rocks, and of Cretaceous Kuskokwim Group black shale, limestone, graywacke, and conglomerate intruded by Cripple Mountain monzonite (McGinnis, 1997; Avalon Development Corp., 1998; Duncan, 1999). Hornfelsed sedimentary rocks, and rare basalt and rhyodacite dikes are present (Barker, 1996; Avalon Development, 1998). Mineralization at the Moose Jaw prospect was exposed in a now-reclaimed trench. What remains is a small pile of stibnite, stibiconite, and vuggy crystalline quartz boulders (Avalon Development, 1998). Several thin quartz-limonite veins are present in float 20 meters to the southeast. Exploration at the Moose Jaw prospect consists of geologic mapping and sampling by Barker during 1994, 1995, and 1996; soil sampling, rock sampling, and geologic mapping by NovaGold during 1998; and mobile-metallic-ion (MMI) sampling by Poseidon Minerals, Ltd. during 1999 (Barker, 1996; Avalon Development Corp., 1998; Duncan, 1999). Also see OP031, 033, and 034; and in the Medfra quadrangle, MD019 and 020.
Workings: During 1994, 1995, and 1996, claimholder Ron Rosander contracted geologist James Barker to evaluate the lode sources of placer gold in the Colorado Creek area. Barker collected 254 soil samples, 93 rock samples, and 12 samples of placer gold for scanning-electron microscope and trace- element analysis. Geologic mapping and a ground-based magnetometer survey were also carried out (Barker, 1996; McGinnis, 1997). In 1996, the Alaska Division of Geological and Geophysical Surveys conducted geologic mapping in the Cripple Creek Mountains and Placer Dome Exploration flew an east-west-oriented aeromagnetic survey over the Cripple Creek Mountains. Nova Gold conducted geologic mapping, rock sampling, and soil sampling during the summer of 1998 (Avalon Development, 1998). During 1999, Poseidon Minerals, Ltd. carried out soil sampling in the Colorado Creek area, and used mobile-metallic-ion (MMI) analyses (Duncan, 1999).
Age: Cretaceous or younger. The igneous rocks associated with the prospect intrude Cretaceous strata of the Kuskowkwim Group.
Alteration: Alteration at the Moose Jaw prospect consists of extensive hornfelsing of the sedimentary rocks adjacent to igneous rocks.

Commodities (Major) - Sb
Development Status: None
Deposit Model: Epithermal Au (Cox and Singer, 1986; model 25b, 25c?)

References

Avalon Development Corp., 1998, Colorado Creek project, Ophir and Medfra quadrangles, southwest Alaska: Avalon Development Corp. report prepared for NovaGold Resources Inc., 9 p. Barker, J.C., 1996, Geologic evaluation of the Colorado Creek prospect area, Alaska: Summary report prepared for Placer Dome Exploration, San Franscisco, Calif., 73 p. Dashevsky, S.S., 2000, Colorado Creek project (Au) Innoko district, Alaska: Unpublished report for Rosander Mining Company, 7 p. Duncan, R.G., 1999, Colorado Creek project, Alaska, interim report: Unpublished report for Poseidon Minerals Ltd., 22 p.

Mineral List

Quartz

Roméite Group var: Stibiconite

Stibnite

3 entries listed. 2 valid minerals.