Ronan Copper

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals arsenopyrite; chalcopyrite; galena; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.001
Longitude -130.049
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ronan Copper prospect is in Section 2 at an elevation of about 2750 feet on the rounded ridge about 0.1 mile west of Skookum Creek, and about 0.8 mile east-southeast of the Riverside mine adit (Maas and others, 1995, p. 252, 255, and fig. 66). The location is accurate within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of the Ronan Copper prospect are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith, 1973, 1977; Koch, 1996).
Maas and others (1995, p. 252, 260) describe the deposit as one of group of gold-bearing pyrrhotite deposits comprising disseminations and masses of sulfide minerals, accompanied by quartz, in shear zones in Hazelton volcanic rocks. The sulfide minerals in this group of deposits include auriferous pyrrhotite, with associated chalcopyrite and arsenopyrite, and local sphalerite and galena.
Maas and others (1995, p. 252) suggest that the Ronan Copper deposit is Jurassic in age, based on similarities in mineralogy, structural setting, and hostrock, to isotopically-dated Jurassic deposits nearby in the Hyder district (see, for example, BC065, 067). If so, the deposit is contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Geologic map unit (-130.050704249036, 56.0007050639255)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Maas and others (1995, p. 252) suggest that the Ronan Copper deposit is Jurassic in age, based on similarities in mineralogy, structural setting, and hostrock, to isotopically-dated Jurassic deposits nearby in the Hyder district (see, for example, BC065, BC067). If so, the deposit is contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Alteration of deposit Volcanic hostrock is impregnated with sulfide minerals.

Production and reserves

Workings or exploration
Prospect has been explored by surface pits and trenches.
Channel samples collected in 1992 by the U.S. Bureau of Mines (Maas and others, 1995, p. 260) contain up to 169 ppb Au, 66.51 ppm Ag, and 2.5 percent Cu.
Indication of production None

References