Hope (west of South Arm Cholmondeley Sound)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Ore minerals cerussite; chalcopyrite; galena; pyrite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-2
Latitude 55.16795
Longitude -132.38106
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Hope prospect is at an elevation of about 2,400 feet, about 0.3 mile south-southeast of elevation 2580. It is about in the center of the NE1/4 section 25, T. 77 S., R 86 E., and about 0.4 mile southeast of the better known and geologically similar Moonshine Mine (CR164).

Geologic setting

Geologic description

The deposit at the Hope prospect is geologically similar to the one at the Moonshine Mine (CR164), about 0.4 mile to the northwest. The rocks in the vicinity of the Hope prospect are greenschist and marble of the Wales Group of Late Proterozoic and Cambrian age (Brew, 1996). The deposit is in folded marble. Prior to World War I, it was explored by a 25-foot adit, a 20-foot inclined shaft, and several trenches. As described by Wright and Wright (1906), the Hope prospect is a vein 1 to 10 feet thick that trends N65E. The marble hostrock is replaced by sphalerite and galena with low silver values. Minor garnet and epidote are also associated with the ore, and cerussite occurs locally as an oxidation product of galena. As described by Herreid and others (1978) and by Maas and others (1991, 1995), the deposit consists of veins and pods of quartz and calcite with galena, sphalerite, and minor chalcopyrite and pyrite that replace marble along numerous shear zones. The best showing examined by Maas and others (1991) was a 3-foot-thick pod of galena and sphalerite exposed in the adit. Samples contained up to 4.16 ounces of silver per ton, 8.71 percent lead, and 17.53 percent zinc. A high-grade galena-rich sample from a trench contained 28.23 percent zinc, 24.49 percent lead, and 4.21 ounces of silver per ton.
Geologic map unit (-132.38273062671, 55.167595624051)
Mineral deposit model Silver-zinc-lead replacement deposit in marble.
Age of mineralization Replacement deposit whose age is known no more closely than that it is in Late Proterozoic or Cambrian host rock.
Alteration of deposit Some garnet and epidote reportedly are associated with this lead-zinc replacement deposit in marble.

Production and reserves

Workings or exploration The deposit was explored prior to World War I by a 25-foot adit, a 20-foot inclined shaft, and several trenches.
Indication of production None
Reserve estimates None.
Production notes Minor at best.

References

MRDS Number A010057

References

Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004