El-10

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; pyrite; sphalerite
Gangue minerals chlorite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TY
Quadrangle map, 1:63,360-scale C-5
Latitude 61.541
Longitude -151.8393
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located about equidistant between Strandine Lake and Coal Creek; NW1/4 of section 29, T. 17 N., R. 14 W., of the Seward Meridian. The location is accurate to within 500 feet.

Geologic setting

Geologic description

El-10 is a prospect in the Beluga Project area. This area has been intruded by younger 62 million year old felsic intrusive volcanic and sedimentary package with that exhibit porphyry style alteration and lead-zinc-silver mineralization. This area is thought to be part of the Jurassic Talkeetna Formation. Numerous color anomalies were noted in the lower parts of the stream valleys within the felsic package and semi-massive float boulders were also discovered (Ellis, 1994).
The showing at El-10 is characterized by chlorite-sulfide stock work, gossanous breccias, and vein breccias. Pyrite, chalcopyrite, and sphalerite are found in dark chlorite and silica. The breccias and veins crosscut rhyolite crystal tuffs in a 1-200 foot area. The style of mineralization and alteration resembles footwall stringers of a VMS-type system. The alteration type is chloritic (Ellis, 1994).
Exploration by American Copper and Nickel Company in 1994 focused on mapping, sampling and prospecting. Eight rock samples and four stream and pan samples from El-10 were collected and analyzed. Average results were 12 parts per million (ppm) silver, 0.03 percent copper,0.6 percent lead, and 3.8 percent with a high of 10.0 percent zinc (Ellis, 1994).
Analysis from a fine-grained porphyry returned an age of 62 million years using argon-argon dating analyzed by the University of British Columbia petrology lab (Ellis, 1994).
Geologic map unit (, )
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Age of mineralization Analysis from a fine-grained porphyry returned an age of 62 million years using argon-argon dating analyzed by the University of British Columbia petrology lab (Ellis, 1994).
Alteration of deposit Chloritic (Ellis, 1994).

Production and reserves

Workings or exploration
In 1993, a reconnaissance effort was carried out by American Copper and Nickel Company's 'Alaska Task Force' to identify targets for future work (Ellis, 1994).
Exploration by American Copper and Nickel Company in 1994 focused on mapping, sampling and prospecting. Eight rock samples and four stream and pan samples from El-10 were collected and analyzed. Average results were 12 parts per million (ppm) silver, 0.03 percent copper, 0.6 percent lead, and 3.8 percent with a high of 10.0 percent zinc (Ellis, 1994).
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 4/8/2014