Unnamed (near head of Harris River)

Occurrences, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities As; Bi; Sb
Ore minerals pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale C-3
Latitude 55.51851
Longitude -132.88072
Nearby scientific data Find additional scientific data near this location
Location and accuracy This record describes several occurrences in an area about a mile square that covers the S1/2 section 24 and N1/2 section 25, T. 73 S., R. 82 E. The site is plotted at about the center of the area, about 0.8 mile northeast of peak 3332.

Geologic setting

Geologic description

Hedderly-Smith (1999 [Inventory]) describes several mineral occurrences in a mile-square area marked by widespread geochemical anomalies. The rocks in the area consist of metamorphosed volcanic and sedimentary rocks of the Luck Creek Breccia of Silurian or Ordovician age that have been intruded by several quartz monzonite sills and dikes. The rocks may form the roof of a buried granodiorite-quartz monzonite intrusion. They commonly are fractured, cut by quartz-pyrite veinlets, and have disseminated pyrite. A float sample of a 3-inch-wide piece of quartz-pyrite vein contained 4,551 parts per million (ppm) copper, 903 ppm lead, 50 ppm arsenic, 39 ppm bismuth, 50.8 ppm silver, 1.535 ppm gold, and 324 ppm antimony. A sample from a steeply-dipping, 3-foot-thick pyrite-pyrrhotite vein contained 4,102 ppm copper, 890 ppm zinc, and 2.1 ppm silver.
Geologic map unit (-132.882369062764, 55.5181531597701)
Age of mineralization Related to a nearby or buried Cretaceous granitic pluton.

Production and reserves

Indication of production None

Additional comments

The land in the vicinity of these occurrences has been identified for possible selection by the Sealaska Corporation.

References

References

Hedderly-Smith, D.A., 1992, Report of the 1991 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 2 vols., 225 p. 23 plates. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1992, Report on 1991 work in the Upper Harris River area-Sealaska minerals reconnaissance project: Sealaska Corporation, 12 p. plus plates. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1997, Report on the 1995 and 1996 work on the Kasaan Peninsula-Sealaska minerals project: Sealaska Corporation, 87 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1997, Results of the 1996 upper Harris River stream sediment sampling-Sealaska minerals reconnaissance project: Sealaska Corporation, 9 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004