Kamishak (Painted River)

Prospect, Active

Commodities and mineralogy

Main commodities Au; Cu
Other commodities Ag; Fe
Ore minerals bornite; chalcopyrite; magnetite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale A-4
Latitude 59.2329
Longitude -154.4713
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Kamishak prospect is in the SE1/4 SE1/4 section 10, T. 11 S., R. 31 W. It is at an elevation of about 1,500 feet on the northwest wall of a southwest-trending canyon that continues into adjacent section 15. The location is accurate within 500 feet.

Geologic setting

Geologic description

The Kamishak prospect is a breccia pipe at least 300 feet in diameter in Jurassic(?) intermediate and mafic igneous rocks (Detterman and Reed, 1980; Alaska Geologic Materials Center, 1995; P. Thurston, written communication, 2003). The strongest mineralization in the pipe is near its walls, and consists of angular blocks of intensely sericitized, fine- to medium- grained gabbro, with 1 to 5 percent sulfides, in a matrix of coarse amphibole, biotite, and plagioclase. Weaker mineralization occurs in less-brecciated to massive gabbro and diorite, containing irregular clots of amphibole, biotite, chlorite, and sulfides. Minor phases of the breccia include hornblende gabbro and gabbroic anorthosite; the anorthosite locally contains a few percent of disseminated magnetite.
The sulfide minerals are chiefly pyrite and chalcopyrite; bornite locally makes up as much 5 percent of the breccia. Malachite coats joint faces of the mineralized rock which also contains up to about 3 percent magnetite. Samples of the breccia locally contain significant gold and copper and up to about 0.3 ounce of silver per ton. American Copper and Nickel Company (ACNC) drilled the deposit in 1990 and 1991 for a total of 5,300 feet (Alaska Geologic Materials Center, 1995). In drill hole 83523, the interval between 166 and 235 feet contained as much as 1,990 parts per billion gold and 2.58 percent copper; none of the core contained less than 102 parts per billion gold and 0.255 percent copper. Drill holes 83521 and 83524 through 83527 are also appreciably mineralized.
Alteration minerals in the breccia include chlorite, biotite, potassium feldspar, and sericite. Relatively high gold values appear to accompany coarse secondary biotite and apparently do not correlate with copper content.
Full Metal Minerals and Andover Ventures drilled 5 holes on this prospect in 2006 that totaled 750 meters (Andover Resources, 2008a, 2008b). Three of the 5 holes cut mineralization. Notable intercepts were: 1) 73.5 meters that contained 0.31 percent copper and 0.28 gram of gold per ton, 2) 51.0 meters that contained 0.48 percent copper and 0.46 gram of gold per ton, and 3) 7.50 meters that contained 0.36 percent copper and 0.53 gram of gold per ton. Two areas of mineralized breccia were identified. The westernmost breccia is a pipelike body about 30 by 50 meters in size; it is cut by a narrow fault with malachite and by thin sulfide- and magnetite-rich veins. The other breccia is a mineralized, pipelike body about 75 by 150 meters in size that extends to a depth of at least 75 meters. It has disseminated copper minerals as well as sulfide-bearing veinlets. This breccia locally contains abundant biotite, is strongly silicified, and also has sericite-pyrite, and chlorite alteration.
In January, 2008 Alix Resources Corp. acquired the property from Full Metals Minerals and proposed future drilling to test two models of the deposit (Alix Resources Corp., 2008). One is that breccia mineralization is related to a porphyry-copper-type deposit. The other is that the breccia is structurally controlled and related to a northwest-striking structure across the property, i.e., the mineralization postdates the diorite and gabbro host rocks.
Geologic map unit (-154.473428636914, 59.2322142659043)
Mineral deposit model Porphyry copper-gold? (Cox and Singer, 1986; model 20c?).
Mineral deposit model number 20c?
Age of mineralization Jurassic?
Alteration of deposit Propylitic and potassic: development of secondary biotite and potassium feldspar; local sericitization.

Production and reserves

Workings or exploration The prospect was discovered by Andy Snyder of the Spokane office of American Copper and Nickel Company (P. Thurston, written communication, 2003). The company core drilled 18 holes in 1990 and 1991 for a total of 5,300 feet. Full Metal Minerals and Andover Ventures drilled 5 holes on this prospect in 2006 that totaled 750 meters (Andover Resources, 2008a, 2008b). In 2008, Alix Resources Corp. acquired the property.
Indication of production None

Additional comments

Much of the geologic description in this record is abstracted from logs of drill core stored at the Alaska Geologic Materials Center in Eagle River, Alaska (Alaska Geologic Materials Center, 1995).

References

References

Alix Resources Corp., 2008, The Kamishak property: http://www.alixresources.com/index.php?page=kamishak (as of May 20, 2008).
Andover Resources, 2008, North Breccia Drilling Summary: http://www.andoverventures.com/projects/kamishak/north_breccia_drill_summary/ (as of March 4, 2008)
Reporters C.C. Hawley, Hawley Resource Group, Anchorage, Alaska; D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008