Ronan

Past Producer in Alaska, United States with commodities Silver, Gold, Lead, Zinc, Tungsten

Geologic information

Identification information

Deposit ID 10308520
Record type Site
Current site name Ronan

Geographic coordinates

Geographic coordinates: -130.04975, 56.00277 (WGS84)
Relative position The Ronan mine is in Section 2 at an elevation of about 2800 feet on the rounded ridge about 0.1 mile west of Skookum Creek, and 0.8 mile east of the Riverside mine (adit) (Maas, 1995, p. 255 and fig. 66). The location is accurate within about 0.1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Primary
Zinc Primary
Tungsten Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Scheelite Ore
Sphalerite Ore
Tetrahedrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -130.04975, 56.00277

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Ronan mine 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; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996). Maas and others(1995, p. 254-257) describe the deposit as a well-defined shear or fracture zone in Texas Creek Granodiorite. The zone strikes northwest and dips steeply northeast, and contains sulfide shoots in quartz or quartz(-granodiorite?)-breccia veins. The principal sulfides are pyrite, galena, sphalerite and tetrahedrite; some of the veins contain scheelite. Samples collected by the U. S. Bureau of Mines in 1992 or 1993 from about 450 feet of the approximately 2-foot-thick main Ronan vein averaged 5.8 ppm Au, 296 ppm Ag, 0.3% Cu, 1.6% Pb, and 0.35% Zn (Maas and others, 1995, p. 257). Lead-isotope studies of galena from the Ronan mine (Maas and others, 1995, p. 254) indicate that the deposit is Eocene in age, contemporaneous with the emplacement of the Hyder Quartz Monzonite.
  • Age = Lead-isotope studies of galena from the Ronan mine (Maas and others, 1995, p. 254) indicate that the deposit is Eocene in age, contemporaneous with the emplacement of the Hyder Quartz Monzonite.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Mining district

District name Hyder

Comments on the production information

  • Production Notes = An unknown, but probably small, amount of gold reportedly was produced from the Ronan deposit (Maas and others, 1995, p. 260).

Comments on the workings information

  • Workings / Exploration = The Ronan mine was explored by pits and trenches, and developed by about 700 feet of underground workings (Maas and others, 1995, p. 255). Samples collected by the U. S. Bureau of Mines in 1992 or 1993 from about 450 feet of the approximately 2-foot-thick main Ronan vein averaged 5.8 ppm Au, 296 ppm Ag, 0.3% Cu, 1.6% Pb, and 0.35% Zn (Maas and others, 1995, p. 257).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF BC086

Bibliographic references

  • Deposit

    Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

  • Deposit

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

  • Deposit

    Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Maas and others, 1995

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = The Ronan vein may continue to the northwest and join the Monarch vein (BC079).

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey