| 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 descriptionThe 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. |
| 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 |