Engineer

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb
Other commodities W
Ore minerals chalcopyrite; galena; pyrite; scheelite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.044
Longitude -130.218
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Engineer prospect is in Section 23 at an elevation of about 3750 feet on a west-facing mountainside overlooking lower Ferguson Glacier (Elliott and Koch, 1981, p. 13, loc. 42). This location is probably accurate within about a quarter of a mile.

Geologic setting

Geologic description

The country rocks in the area of the Engineer prospect are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996).
The deposit (Buddington, 1929, p. 109-110) consists of a quartz fissure vein 1-4.5 feet (generally 2-4 feet) thick hosted by Texas Creek Granodiorite near its contact with Hazelton argillite and graywacke. The vein locally contains masses of chalcopyrite, pyrite, and galena, and rare grains of scheelite. Assays of seven specimens from the sulfide-rich masses showed 0.04-0.64 oz Au and 7.6-26 oz Ag per ton, and 11.3-55.3 percent Pb.
Lead-isotope studies of galena from the Engineer prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Geologic map unit (-130.219705160203, 56.0436923934372)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Lead-isotope studies of galena from the Engineer prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Production and reserves

Workings or exploration
Prospect was explored, probably in the 1920s, by a 30-foot adit and several opencuts.
Early assays of seven specimens from sulfide-rich masses showed 0.04-0.64 oz Au and 7.6-26 oz Ag per ton, and 11.3-55.3 percent Pb.
Indication of production None

References