Kael Pit

Prospect, 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 55.19926
Longitude -132.06712
Nearby scientific data Find additional scientific data near this location
Location and accuracy This deposit is probably the initial discovery in a mineralized belt called the 'Kael-7 Mile Trend' (CR188). The deposit was first described by Hedderly-Smith (1999 [Inventory]), although he does not specifically use the name Kael Pit in his description. 'Kael Pit' is the name applied by Maas and others (1991, 1995) to a borrow pit along a Forest Service road, about 0.5 mile northwest of the center of section 18, T. 77 S., R. 89 E. This site is near, or the same as, the old Park View prospect (CR187).

Geologic setting

Geologic description

The Kael Pit deposit is one of several in a mineral belt called the Kael-7 Mile Trend (CR188). The rocks in the area consist mainly of marble with minor chlorite schist, cut by greenstone dikes and sills. The metamorphic rocks 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, 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 contains up to 50 percent pyrite and chalcopyrite, but generally contains only a few percent of sulfides.
The mineralization in the Kael Trend was discovered in 1988 by a Sealaska geologist. The discovery, presumably at or near this site, was soon leased to the American Copper and Nickel Company, who mapped and sampled the the mineralization along 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, one or both of which may be at or near or the Kael pit.
As described by Maas and others (1991, 1995), the Kael Pit deposit consists of two silicified marble-breccia zones 15 feet thick separated by 50 feet of marble with interbedded greenstone. The breccia zones contain clots of pyrite and chalcopyrite. Samples 1.2 to 9.5 feet long contained 12 to 1,938 parts per billion gold and 23 to 2,800 parts per million (ppm) copper. A sample of massive pyrite contained 0.360 ounce of gold per ton and 4,809 ppm copper.
Geologic map unit (-132.068791053615, 55.1989047962911)
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 is in a belt of mineralization about 4 miles long and 0.5 mile wide that is called the Kael-7 Mile Trend (CR188). The mineralization was discovered in 1988 by a Sealaska geologist. The property 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, one or both of which may be at or near the Kael pit.
Indication of production None

References