Annex Number 1

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Sn; Zn
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-4
Latitude 59.39
Longitude -136.26
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located in the cliffs on the west side of Porcupine Creek approximately 0.7 miles up Porcupine Creek from its junction with McKinley Creek. It is identified as 'Annex Number 1' in Still and others (1991).

Geologic setting

Geologic description

The following description is from Still and others (1991). Pyrite-bearing quartz veins are associated with tan to gray altered dikes. Samples of narrow, discontinuous veins in the margins of dikes and in slate contain from 0.2 to 114.1 ppm gold. Samples of dike and slate contain from 0.005 ppm to 0.315 ppm gold. Selected high-grade (vein?) samples also contain up to 9 ppm silver, 840 ppm zinc, 100 ppm tin, and 0.8% arsenic.
These quartz-sulfide veins occur within the northwest-trending zone of quartz-sulfide veining in sediments and slates in the Skagway B-4 quadrangle that is described by Wright (1904 [B 225 and B 236], Eakin (1918 and 1919), and MacKevett and others (1974). Other similar occurrences in the area include the McKinley Falls (SK046) and Golden Eagle (SK047) prospects, and the unnamed zone of veining near the mouth of Cahoon Creek (SK042). This prospect may be within the zone of veining referred to in SK042.
Geologic map unit (-136.261858295848, 59.3896704479766)
Mineral deposit model There is little information, but the brief description by Still and others (1991) mentions polymetallic veins in dikes (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Unknown, but probably Cretaceous or younger based on age of intrusives in area (MacKevett and others, 1974).
Alteration of deposit Based on similarity to the Golden Eagle (SK047) and other prospects in the area, the tan to gray altered dikes are probably mafic dikes that have been altered to silica-carbonate rock.

Production and reserves

Workings or exploration This prospect was discovered by Jerry Fabrizio, a local prospector, in 1983 (Still and others, 1991).
Indication of production None