Kael-7 Mile Trend Prospects, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Kael-7 Mile Trend Prospects	Group of Prospects
Prince of Wales Island	Island
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: 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.
Geology: 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.
Workings: 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.
Age: Vein is younger than the Late Proterozoic or Cambrian host rocks.
Alteration: Marble is silicified and dolomitized in the mineralized breccia zones.

Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Stratiform Au-Cu breccia zones in marble.

Other Databases

Link to USGS - Alaska:	CR188

Other Regions, Features and Areas containing this locality

References