Nunatak; Saksaia Glacier Prospect, Haines, Alaska, USAi

Regional Level Types
Nunatak; Saksaia Glacier Prospect	Prospect
Haines	City Borough
Alaska	State
USA	Country

Location: The location is in the approximate center of the prospect which extends for about 1,500 feet between 3,800 and 4,500 feet in elevation on a nunatak within the Saksaia Glacier. It is near the center of section 12, T. 29 S., R. 53 E. of the Copper River Meridian. It is shown as location 11 by Cobb (1972 [MF 424]) and in Figure 7 in Still (1984 [OF 118-84]).
Geology: According to Still (1984 [OF 21-84]), the prospect consists of an iron-stained zone of quartz-sericite schist and altered volcanic rocks exposed for 1,500 feet across the face of a nunatak. Barite lenses and beds containing interbedded and remobilized sulfides occur within this zone. The mineral assemblage and field relationships are similar to the Main Zone/Palmer prospect (SK066) (MacKevett and others, 1974). Rubblecrop indicates that some of the baritic beds may be up to 20 feet thick. Samples of the baritic rock contain up to 2.58 ppm gold, 335.3 ppm silver, 2.38% zinc, 1,820 ppm copper, 2.0% lead, 48% barite, and 1,000 ppm arsenic. A 200-pound sample collected by Merrill Palmer was divided into 13 separate samples and analyzed by Newmont Gold Company. The samples averaged 11.84 ounces of silver per ton and 0.092 ounces of gold per ton. This prospect lies along a northwesterly mineral trend that extends through the Cap prospect (SK060) to the Mount Henry Clay prospect (SK068). Rubicon Minerals considers these prospects to all occur at the same mineralized stratigraphic horizon and attributes their distribution to a northwest-trending, shallowly plunging antiform that brings the massive-sulfide horizon close to the surface (Rubicon Minerals, 1998). The Nunatak prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OF 118-84]; Newberry and others, 1997).
Age: The Nunatak prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are, therefore Late Triassic (Still, 1984 (OFR 118-84); Newberry and others, 1997).
Alteration: Phyllic.

Commodities (Major) - Ag, Au, Ba, Cu, Pb, Zn
Development Status: None
Deposit Model: Besshi- or Kuroko-type volcanogenic massive sulfide deposit (Cox and Singer, 19

Other Databases

Link to USGS - Alaska:	SK058

Other Regions, Features and Areas containing this locality

References