Six Point

Prospect, Undetermined

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale B-6
Latitude 55.381
Longitude -131.849
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.

Geologic setting

Geologic description

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.

Production and reserves

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

References