Kael-7 Mile Trend

Prospects, Active?

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-1
Latitude 55.20032
Longitude -132.04791
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents the Kael-7 Mile Trend, a belt of similar geology and mineral deposits about 0.5 mile wide and 4 miles long. The center of the belt is at the southwest corner of section 8, T. 77 S., R. 89 E. The belt includes the Kael Pit (CR186), O.K. (CR189), 7 Mile Gold (CR190), and Roy Creek (CR191) prospects.

Geologic setting

Geologic description

This site represents a belt of mineralization about 4 miles long and 0.5 mile wide. It includes several prospects (CR186 and CR188-191), but the mineralization and its geochemical expression occur throughout the belt. The mineralization was discovered in 1988 by a Sealaska geologist. That discovery (CR 186) was soon leased to the American Copper and Nickel Company, who mapped and sampled the belt, and drilled 26 shallow holes in 1990 and 1991, mainly on geochemical anomalies. Three holes totaling 2,837 feet were drilled in 1994, one at the Roy Creek prospect (CR191) at the east end of the belt, and two at the west end.
The rocks in the area consist mainly of marble and minor chlorite schist, cut by greenstone dikes and sills. They are part of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). The mineralization is stratiform and and consists of breccia veins or zones (Hedderly-Smith, 1993, 1999 [Inventory]). The clasts in the breccia vary from fresh marble to ferroan(?) dolomite to silicified marble. The matrix is mainly quartz; locally the matrix may contain up to 50 percent pyrite and chalcopyrite, but it generally contains only a few percent of sulfides. Assays of drill core vary from insignificant values to 11.9 feet of material that averages 0.127 ounce of gold per ton. This intercept includes 1.4 feet that grades 0.635 ounce of gold per ton and 3 feet that grades 0.207 ounce of gold per ton. Hedderly-Smith (1993) suggests that the mineralization is the result of remobilization of volcanogenic massive sulfide deposits, possibly driven by the intrusion of a nearby granitic pluton.
Geologic map unit (-132.049582383297, 55.1999650103443)
Mineral deposit model Stratiform Au-Cu breccia zones in marble.
Age of mineralization Vein is younger than the Late Proterozoic or Cambrian host rocks.
Alteration of deposit Marble is silicified and dolomitized in the mineralized breccia zones.

Production and reserves

Workings or exploration This site represents a belt of mineralization about 4 miles long and 0.5 mile wide. It includes several prospects (CR186 and CR188-191), but the mineralization and its geochemical expression occur throughout the belt. The mineralization was discovered in 1988 by a Sealaska geologist. That discovery (CR 186) was soon leased to the American Copper and Nickel Company, who mapped and sampled the belt, and drilled 26 shallow holes in 1990 and 1991, mainly on geochemical anomalies. Three holes totaling 2,837 feet were drilled in 1994, one at the Roy Creek prospect (CR191) at the east end of the belt, and two at the west end.
Indication of production None

References

References

Hedderly-Smith, D.A., 1989, Report of the 1988 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 66 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1990, Report of the 1989 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 58 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1992, Report of 1992 work in the Kael-Dolomi area-Sealaska minerals project: Sealaska Corporation, 60 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1993, Report of the 1992 field season-Sealaska minerals reconnaissance project: Sealaska Corporation, 60 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1995, Report of the 1994 work in the Kael-Dolomi area-Sealaska minerals project: Sealaska Corporation, 36 p. plus appendices (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004