Stinging Cliffs

Prospect, Active?

Commodities and mineralogy

Main commodities Au; Cu; Pb; Zn
Other commodities Hg
Ore minerals chalcopyrite; galena; pyrite; pyrrhotite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-5
Latitude 58.9132
Longitude -135.4058
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is approximately 1.5 miles west of Lynn Canal and 3 miles west of Sullivan Island. It is at an elevation of about 950 feet, 1/2 mile north of the Sullivan River. It is in the NE1/4 section 21, T. 34 S., R. 60 E. of the Copper River Meridian. The Sullivan River is not named on the current (1996) edition of the D-5 topographic map. The location is accurate.

Geologic setting

Geologic description

In 1989, Placer Dome U.S. discovered a stratabound sulfide deposit here that consists of pyrrhotite, sphalerite, chalcopyrite, pyrite, and galena in a siliceous layer along the contact between marble and chlorite-graphite schist. The sulfide layer is 2 feet to 8 feet thick and has been traced continuously along strike for 300 feet. Another exposure of the same sulfide-bearing layer has been identified along strike 2,300 feet to the southeast. The sulfide-bearing horizon is at the same stratigraphic position as the one at the CP prospect (JU013) (Bull and others, 1989). Samples collected by Placer Dome contained up to 2.5 ppm gold, 6.0% zinc, 0.2% lead, 0.2% copper, 2% mercury, and 570 ppm barium. Placer Dome U.S. drilled 3 diamond drill holes at the Stinging Cliffs prospect in 1989. Although the stratabound, volcaniclastic-hosted, sulfides suggest volcanogenic origin, Placer Dome U.S. geologists interpreted the deposit as a pre- or syn-metamorphic, hydrothermal-replacement deposit, possibly related to a pluton (Bull, 1991).
This deposit is one of many in the Dream prospect area that includes numerous veins, stockworks, stratabound and stratiform sulfide deposits (also see JU002, JU006, JU009, JU011, JU013, JU014, JU016, JU019), most of which occur near a volcaniclastic-marble contact. The U.S. Bureau of Mines (Clough and Redman, 1989), International Curator Resources, Ltd. (Huber and Barnett, 1988), and Placer Dome U.S. (Bull and others, 1989) explored the area in the late 1980s and developed a general lithology of the area. They divide the rocks into four major rock units. From the base up, they are: 1) a volcaniclastic unit approximately 2000 feet thick that consists of albite-chlorite schist, chlorite schist, and chlorite-quartz-sericite schist that may in part be metaplutonic as well as metavolcanic; 2) a unit 800 feet thick of micaceous marble, pelitic schist, graphite schist, gray to white, cliff-forming marble, chlorite-amphibole schist, greenstone, and phyllitic graphite schist; and 3) a unit of very fine-grained chlorite-sericite-biotite schist over 1000 feet thick that includes metatuff and pelitic, mafic and graphitic schist. The upper contact of this unit is a thrust fault that trends N-S for several miles; quartz veining is common along the thrust contact. The rocks overlying the thrust are middle- to upper-greenschist-facies graphitic schist, argillite, phyllite, and marble. The metamorphic grade of the rocks varies from mid- to upper-greenschist facies in the south, to amphibolite facies in the north. There have been at least two stages of folding.
The Dream prospect area was the site of extensive exploration and mapping from 1987 through 1990 by International Curator Resources Ltd. and Placer Dome U.S. The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling was completed by the end of 1990 (Swainbank and others, 1991).
The general area consists predominantly of metamorphosed Silurian and Devonian clastic rocks, limestone, and volcanic units; Permian limestone and siltstone; and small plutons of Tertiary and Cretaceous granodiorite (Brew and Ford, 1985).
Geologic map unit (-135.407646506835, 58.912873448611)
Mineral deposit model Possibly a metamorphosed Kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a) or a metamorphosed polymetallic replacement deposit (Cox and Singer, 1986; model 19a)
Mineral deposit model number 28a or 19a

Production and reserves

Workings or exploration In 1989, 3 diamond drill holes were drilled at the Stinging Cliffs prospect by Placer Dome U.S. (Bull, 1991). The Dream prospect area, which includes this prospect, was the site of extensive exploration and mapping from 1987 through 1990 by International Curator Resources Ltd. and Placer Dome U.S. The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling was completed by the end of 1990 (Swainbank and others, 1991).
Indication of production None

References

References

Bull, K.F., 1991, The Dream project--Model frustration: Journal of Alaska Miners Association, v. 19, no. 10, p. 17.
Bull, K.F., and Radford, G., 1989, Dream project 1989; Final report: Unpublished report for Placer Dome U.S., Inc., 49 p.
Huber, J.A., and Barnett, J.C., 1988, The Dream massive sulfide project; 1988 Progress Report: Unpublished report for International Curator Resources, Ltd., Denver, Colo., 51 p.
Reporters J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date 12/15/2001