Hope Prospect, South Arm of Cholmondeley Sound, Cholmondeley Sound, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Hope Prospect	Prospect
South Arm of Cholmondeley Sound	- not defined -
Cholmondeley Sound	Bay
Prince of Wales Island	Island
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: 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).
Geology: 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 oxidization 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.
Workings: The deposit was explored prior to World War I by a 25-foot adit, a 20-foot inclined shaft, and several trenches.
Age: Replacement deposit whose age is known no more closely than that it is in Late Proterozoic or Cambrian host rock.
Alteration: Some garnet and epidote reportedly are associated with this lead-zinc replacement deposit in marble.
Production: Minor at best.
Reserves: None.

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Silver-zinc-lead replacement deposit in marble.

Other Databases

Link to USGS - Alaska:	CR165

Other Regions, Features and Areas containing this locality

References