Iron Cap Prospect (ARDF - BC045), Hyder District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Location: The Iron Cap prospect is at the south boundary of Section 11 at an elevation of about 3850 feet on a south-facing mountainside overlooking the West Fork of Texas Creek, and about 1.8 mile east-northeast of the outlet of Texas Lake (Elliott and Koch, 1981, p. 14, loc. 45). The location is accurate to within about a quarter of a mile.
Geology: The country rocks in the area of the Iron Cap prospect are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite (Smith, 1977; Koch, 1996). The deposit (Buddington, 1929, p. 44, 98) consists of an 11-foot zone of slate and fine-grained tuffaceous graywacke containing stringers and veins of sulfides, and a 2-foot quartz-calcite vein carrying pyrrhotite, chalcopyrite, sphalerite, and a little arsenopyrite. The deposit, which is about 100 feet above the contact of the Texas Creek Granodiorite, is approximately parallel to the bedding in the slate and graywacke hostrocks. A sample (Buddington, 1925, p. 95) assayed 0.04 oz Au and 6.28 oz Ag per ton, and 2% Cu.
Workings: Deposit was explored in 1920's by an opencut 12 feet wide. A sample (Buddington, 1925, p. 95) assayed 0.04 oz Au and 6.28 oz Ag per ton, and 2% Cu.
Alteration: Slate and graywacke country rocks are impregnated with sulfide minerals.
Commodities (Major) - Ag, Au, Cu, Zn
Development Status: None
Deposit Model: Polymetallic veins
6 entries listed. 6 valid minerals.
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Buddington, A.F., 1925, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 773-B, p. 71-139. Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p. Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360. Koch, R.D., 1996 [In press), Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report, 1 sheet, scale 1:250,000. Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p., 1 plate.