Zygoat

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-2
Latitude 63.2684
Longitude -144.7218
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Zygoat occurrence is at an elevation of about 8,100 feet, 3.2 miles northwest of Mount Kimball and 0.6 mile west of the Goat occurrence (MH251). It is south of a glacier at the head of the West Fork Robertson River near the center of section 17, T. 19 S., R. 16 E., Fairbanks Meridian. The location is accurate.

Geologic setting

Geologic description

The Zygoat occurrence is part of a series of distinctive, generally barren massive and semimassive pyrite-rich layers in the upper portion of the Hayes Glacier belt of rocks. This mineralized trend can be traced discontinuously from south of the Tok Glacier to the head of the Gakona Glacier. The massive sulfides occur in pyritic felsic metavolcanic rocks or at the contact of the metavolcanic rocks with graphitic schist or limestone (R.A. Blakestad and others, unpublished Resource Associates of Alaska Inc. report, 1978; E. Hunter, unpublished data, 1998).
The Zygoat occurrence is in rocks that consist mainly of metamorphosed quartz keratophyre and meta-andesite and sparse metadacite and metabasalt These metavolcanic and subordinate metasedimentary rocks are included in the Hayes Glacier subterrane, the age of which is Devonian and older (Nokleberg and others, 1992).
Geologic map unit (-144.724040183466, 63.2680130159584)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a).
Mineral deposit model number 28a
Age of mineralization Devonian and older, on the basis of the age of the host rock, which is in the Hayes Glacier subterrane (Nokleberg and others, 1992).

Production and reserves

Workings or exploration The Zygoat occurrence is part of a belt of distinctive, generally barren massive and semimassive pyritic mineralization discovered in the upper portion of the Hayes Glacier belt of rocks. This mineralized trend was traced discontinuously from south of the Tok Glacier to the head of the Gakona Glacier.
Indication of production None

Additional comments

Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.

References