Unnamed (east fork Bond Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-4
Latitude 62.2353
Longitude -142.6778
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the south side of the headwaters of the east fork of Bond Creek. It is at an elevation of about 5,600 feet, 1,700 feet south of Bond Creek, and 2 miles northwest of peak 8310. The prospect is about 0.5 mile north-northwest of the center of section 8, T. 5 N., R. 15 E. of the Copper River Meridian. This is locality 19 of Richter (1973), locality 31 of Richter and others (1975), and National Park Service locality WRST-37 (unpublished data). Cobb and Richter (1980) included this prospect under the name 'East Fork'. It is located to within a few hundred feet.

Geologic setting

Geologic description

Quartz-pyrite-molybdenite veins and veinlets cut strongly altered and brecciated trondhjemite. The trondhjemite forms an intrusive stock in other granitic rocks of the mid-Cretaceous Nabesna pluton (Richter, 1973). The deposit is estimated to contain 50 million tons with an average grade of about 0.01 percent molybdenum (Richter and others, 1975).
Geologic map unit (-142.679928791805, 62.2349169340698)
Mineral deposit model Porphyry Mo, Low-F (Cox and Singer, 1986; model 21b)
Mineral deposit model number 21b
Age of mineralization Mid-Cretaceous. The intrusive host rocks are part of the Nabesna pluton. K/Ar ages for the Nabesna pluton range from 105 +/- 4.0 to 114 +/- 3.4 Ma (Richter, Lanphere, and Matson, 1975). Many varieties of probably Tertiary hornblende-plagioclase porphyry form irregular intrusive bodies in the Nabesna pluton and other regional bedrock units in the area (Richter, 1973).
Alteration of deposit The host rocks to this deposit are highly altered but the type and extent of alteration have not been reported. The area is iron-stained.

Production and reserves

Workings or exploration The prospect has been explored since 1967.
Indication of production None
Reserve estimates The deposit is estimated to contain 50 million tons with an average grade of about 0.01 percent molybdenum (Richter and others, 1975).

Additional comments

The prospect is in the Wrangell-St. Elias National Preserve.

References

MRDS Number A011404

References

Reporters Travis L. Hudson (Applied Geology)
Last report date 11/24/2002