|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Six Point prospect is within a few yards of tidewater on the south side of Vallenar Bay, about 1.2 miles east of South Vallenar Point. The site is in section 11, T. 75 S., R. 89 E., of the Copper River Meridian. It corresponds to loc. 53 in Elliott and others (1978). The location is accurate within 0.1 mile.|
The country rocks in the general area of this prospect are complexly folded and faulted Devonian carbonate and clastic strata; Upper Triassic carbonates, clastics, and basaltic and rhyolitic volcanic rocks; and Upper Jurassic or Lower Cretaceous flysch (Berg, 1973; Berg and others, 1988). At least some of the folding was accompanied by low-grade regional metamorphism, probably in Late Cretaceous time.The deposit consists of a pinch-and-swell quartz fissure vein up to a few feet thick that contains pyrite and a little chalcopyrite (Brooks, 1902, p. 73-74; Wright and Wright, 1908, p. 140). The vein follows a fault-breccia zone at the contact between an altered mafic(?) dike and Devonian slaty limestone, and apparently formed during or after the Late Cretaceous folding and regional metamorphism. The deposit was prospected for gold in the early 1900s, and explored at that time by a shaft and tunnel of unknown length.
|Geologic map unit||(-131.850681749012, 55.3806446511612)|
|Mineral deposit model||Low-sulfide gold-quartz veins? (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a?|
|Age of mineralization||Late Cretaceous or younger.|
|Workings or exploration||The deposit was prospected for gold in the early 1900s, and explored at that time by a shaft and tunnel of unknown length.|
|Indication of production||None|
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000.
Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.
Elliott, R.L., Berg, H.C., and Karl, S.M., 1978, map and table describing metalliferous and selected non-metalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73-B, 17 p., 1 sheet, scale 1:250,000.
|Reporters||H.C. Berg, USGS|
|Last report date||7/1/1999|