Hillside

Occurrence, Inactive

Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Fe
Ore minerals galena; iron-rich gossan
Gangue minerals dolomite

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale B-3
Latitude 63.44
Longitude -154.126
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Hillside lead occurrence is on a south-facing slope at 1,800 feet (549 m) in elevation near the West Fork of Beaver Creek; it is about 2,500 feet (760 m) southwest of the Beaver prospect in Section 6, T. 24 S., R. 25 E., of the Kateel River Meridian. Location is known within about 250 feet (76 m).

Geologic setting

Geologic description

At the Hillside occurrence, iron-rich gossan occurs in a 100 feet by 50 feet (30 m by 15 m) area that is hosted in solution breccias of the Beaver Creek Dolomite (Schmidt, 1997). Mineralization is believed to occur in roughly the same 'stratigraphic' horizon as the Beaver (MD048), Big Gate (MD050), and Bermuda (MD045) Mississippi Valley Type occurrences, which occur along the south limb of Beaver Creek Syncline. Host units are inferred to be Lower Paleozoic from fossils in dolomite (Blodgett, 1982).
Grab samples from surface exploration contain from 0.22 to 2.40 percent lead and up to 2,200 ppm zinc in a 100 feet by 50 feet (30 m by 15 m) area (Schmidt, 1997).
Geologic map unit (-154.128329665882, 63.439409104388)
Mineral deposit model Southeast Missouri Pb-Zn (Cox and Singer, 1986; model 32a) or Mississippi Valley type (Cox and Singer, 1986; model 32b).
Mineral deposit model number 32a or 32b
Age of mineralization Host units are inferred to be Lower Paleozoic from fossils in dolomite. (Blodgett, 1982); however, the age of the mineralization is unknown.

Production and reserves

Workings or exploration The Hillside occurrence was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the 'Reef Ridge district' (Schmidt, 1997). Grab samples from surface exploration contain from 0.22 to 2.40 percent lead with up to 2,200 ppm zinc in a 100 feet by 50 feet (30 m by 15 m) area (Schmidt, 1997).
Indication of production None
Reserve estimates None.

Additional comments

See Beaver (MD048), Big Gate (MD050), and Bermuda (MD045) Mississippi Valley Type showings.

References

References

Anderson, G.M., and Macqueen, R.W., 1988, Mississippi Valley Type lead-zinc deposits, in Roberts, R.G., and Sheahan, P.A., eds., Ore deposit models: Geoscience Canada Reprint Series 3, Ottawa, Canada, p. 79-90.
Blodgett, R.B., 1982, Stratigraphy of Reef Ridge project area; WGM Inc., Anchorage, Alaska, Reef Ridge Project area, Block 10, Doyon region: WGM Inc., 34 pages.
Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
Reporters Bundtzen, T.K. (Pacific Rim Geological Consulting)
Last report date 6/2/1998