Addison Powell

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Zn
Ore minerals chalcopyrite; gold; malachite; pyrite; pyrrhotite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale A-6
Latitude 61.0126
Longitude -146.0978
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the north side of the valley of an unnamed south tributary to the lower Lowe River. The mouth of this tributary is 3.3 miles upstream from Canyon Slough. The prospect is at an elevation of about 1,500 feet in the center of the S1/2 section 10, T. 10 S., R. 5 W., of the Copper River Meridian. This prospect is probably located to within one-half mile. It is locality 41 of Cobb and Matson (1972) and locality 33A of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Stratiform lenses and disseminations of sulfide minerals occur in mafic metavolcanic rocks and metasedimentary rocks of the Valdez Group; the sulfide minerals include chalcopyrite, pyrite, pyrrhotite, and sphalerite (Winkler, Miller, and others, 1981). Early work on this prospect described it as a large but low-grade deposit with chalcopyrite, some malachite, and a little gold. It was explored by about 150 feet of open cuts and a 100-foot-long adit (Johnson, 1916). The metavolcanic rocks probably represent ocean-floor basalts that were accreted with the flysch of the Valdez Group (Winkler and others, 1981 [OFR 80-892-A]).
Geologic map unit (-146.099816468707, 61.012081724732)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Late Cretaceous; the host metavolcanic rocks probably represent ocean-floor basalts that were accreted along the enclosing flysch of the Valdez Group (Winkler and others, 1981 [OFR 80-892-A]).
Alteration of deposit Oxidation; the deposits are iron-stained (Winkler and others, 1981 [OFR 80-892-B]).

Production and reserves

Workings or exploration Early work on this prospect included about 150 feet of open cuts and a 100-foot-long adit (Johnson, 1916).
Indication of production None

References