Road Metal

Prospect, Active?

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb
Other commodities Bi; Sb
Ore minerals bismuthinite; chalcopyrite; galena; gold; pyrite; silver sulfosalts; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale A-2
Latitude 63.0152
Longitude -141.7895
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Road Metal prospect is a 1.5 mile-long northeast trend of silver-gold-base metal mineralization on Doyon, Limited conveyed land near the Northway Junction along the Alaska Highway near the Canadian border. The prospect site is centered on a 500 square meter area of drilling in the gold geochemical anomaly near an intrusion breccia along the northern edge of section 10, T. 14 N., R. 19 E. of the Copper River Meridian.

Geologic setting

Geologic description

The Road Metal prospect lies within the Yukon-Tanana terrane between the Tintina fault to the north and the Denali fault to the south. The region is comprised mostly of greenschist to amphibolite grade Paleozoic metasedimentary rocks and some mafic to felsic meta-igneous rocks. These Paleozoic rocks were extensively intruded by Mesozoic and Cenozoic granitic rocks and minor intermediate and mafic rocks. The area north of the Road Metal prospect contains abundant Cretaceous and Tertiary volcanic rocks. The Road Metal prospect lies within what has been mapped as a poorly exposed, coarse- to fine-grained Cretaceous batholith that ranges in composition from felsic to mafic (Foster, 1970, 1992).
Drilling completed on the gold geochemical anomaly at Road Metal has shown mineralization to be intrusion-hosted. An intrusion breccia, which contains granite and aplite clasts in a porphyritic granite matrix, has been mapped in the vicinity of drilling (North Star Exploration, 2001).
Geologic map unit (, )
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c?

Production and reserves

Workings or exploration
At the Road Metal prospect grid soil sampling completed by North Star Exploration, Inc. between 1997 to 2002 identified an open-ended, 1.5 mile-long trend of silver-gold-base metal mineralization. Twelve line kilometers of ground geophysics (magnetics and induced polarization) completed shows an anomaly which is adjacent to the mineralized trend (North Star Exploration, 2001; North Star Exploration, 2002; North Star Exploration, 2003).
Core drilling between 2000 to 2002 totaling 17,984 feet in 22 holes at the Road Metal prospect intersected intrusion-hosted, base metal mineralization that has silver grades of up to 135 ounces per ton (oz/ton) and gold grades of up to 2.51 oz/ton (North Star Exploration, 2002; North Star Exploration, 2003). Five of the drill holes completed by North Star Exploration, Inc. in 2000 intersected high-grade intercepts including three very significant intervals of silver-gold bearing sulfide and sulfosalt mineralization: 17.8 feet assaying 0.263 oz/ton gold and 14.7 oz/ton silver, 15.7 feet grading 0.03 oz/ton gold and 48.5 oz/ton silver, and 73.8 feet grading 0.045 oz/ton gold and 0.35 oz/ton silver. Corresponding base-metal assays for the intersections range up to 0.86 percent copper, 3.22 percent lead, 0.92 percent bismuth, and 2.80 percent antimony (Doyon Limited, 2015; North Star Exploration, 2001).
Indication of production None

Additional comments

The Road Metal prospect is located within Doyon, Limited conveyed land. For more information contact Doyon, Limited, Fairbanks, Alaska.

References

References

Reporters N.V. King (Alaska Earth Sciences)
Last report date 3/15/2016