Unnamed (near Mount Howard)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; As; Au; Cu; Pb; Zn
Ore minerals galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PA
Quadrangle map, 1:63,360-scale A-1
Latitude 56.1102
Longitude -134.18048
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 0.8 mile west-northwest of Mount Howard and about 0.3 mile east of the northwest corner of section 31, T. 66 S. R. 73 E. Figure 6 of Still and others (2002) is a map of the deposit; the location is accurate.

Geologic setting

Geologic description

This occurrence was first described by Roehm (1942) and was recently mapped and sampled by Still and others (2002). The deposit consists of several quartz veins with an aggregate thickness of about 6 feet. The veins are associated with a fault zone and are generally parallel to the bedding of the folded host rocks, which are limestone, silty limestone, and chert. The rocks are part of the Bay of Pillars Formation of Silurian age (Brew and others, 1984). A large Cretaceous hornblende quartz monzonite crops out about a mile to the east. The veins, fault zone, and strata generally strike N60W and dip 75 SW to vertical. The veins contain irregular masses, bands, and disseminations of pyrite with minor sphalerite and galena. The highest grade sample collected by Still and others (2002) across 1.3 feet of a quartz vein contained 134 parts per billion gold, 2,959 parts per million (ppm) zinc, and 1,264 ppm arsenic. Another sample contained 15 ppm silver and 353 ppm lead across 0.7 feet and a sulfide-rich sample collected in the quartz vein contained 25.2 ppm silver, 1,153 ppm copper, 8,692 ppm lead and 14,558 ppm zinc.
Geologic map unit (-134.18221840668, 56.1098134619463)
Mineral deposit model Polymetallic quartz vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The veins cut Silurian strata and may be related to a nearby Cretaceous quartz monzonite stock.

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None