Houghton

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Zn
Ore minerals chalcopyrite; copper; magnetite; pyrite; pyrrhotite; sphalerite
Gangue minerals epidote; garnet

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-2
Latitude 55.26366
Longitude -132.62147
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Houghton prospect is about 0.8 mile north-northwest of Mount Jumbo. It is at an elevation of about 1,650 feet, about 0.3 mile east-southeast of the center of section 22, T. 76 S., R. 84 E., of the Copper River Meridian.

Geologic setting

Geologic description

The Houghton is an old prospect that was discovered between 1900 and 1903 and was explored by several adits and surface workings prior to 1908 (Wright and Wright, 1905; Wright, 1915; Roppel, 1991). There has been little work since.
The deposit consists of small, irregular pods of sulfides in garnet-epidote skarn. The skarn is about 65 feet thick and extends for several hundred feet along a faulted contact between Cretaceous granodiorite and marble of the Wales Group of Late Proterozoic or Cambrian age (Wright and Wright, 1908; Herreid and others, 1978; Maas and others, 1991, 1995). The ore minerals are mainly chalcopyrite, magnetite, and pyrite, with minor sphalerite, pyrrhotite, and native copper. Samples collected by Maas and others (1991, 1995) in the adits contained up to 2,630 parts per billion gold, 465 parts per million silver, and 10.44 percent copper, but the mineralization is restricted to small pods.
Geologic map unit (-132.623125533437, 55.2633084466021)
Mineral deposit model Cu-Fe skarn (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b
Age of mineralization Related to nearby Cretaceous granodiorite.
Alteration of deposit Mineralization associated with garnet-epidote skarn.

Production and reserves

Workings or exploration The prospect was explored by three adits, 80, 100, and 200 feet long, and several surface trenches, mostly before 1908; and an aerial tram extended to down to Hetta Inlet. The property has been inactive since the 1920s.
Indication of production None

Additional comments

The Houghton prospect is on or surrounded by land that has been conveyed to the Sealaska Corporation, who hold the surface and subsurface rights, or the land is under application for transfer to them.

References

MRDS Number A010112

References

Roppel, Patricia, 1991, Fortunes from the earth: Manhattan, Kansas, Sunflower University Press, 139 p.
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004