|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||
This site, called 'Fish Creek, lower workings' by Buddington (1929, pl. 2, loc. 5 [B 807]) and by Byers and Sainsbury (1956, pl. 7, loc. 5), represents a group of claims that lie mainly on the ridge between Fish and Skookum creeks, but extend to both sides of the creeks, particularly west of Skookum Creek. The main workings are on the Olympia and Starboard claims, which are at elevations of about 1400-1900 feet. The map coordinates are for the approximate center of the area of these workings. The site is in section 11, T. 68 S., R. 99 E., of the Copper River Meridian. It corresponds to loc. 3 in Elliott and others (1978). The location is accurate within about 0.1 mile.To the north, the claims extend into the Bradfield Canal quadrangle (Berg, 1998, loc. BC078). On the south, they are adjoined by the Mountain View group of claims (KC006), some of which are named 'Fish Creek.'
The country rocks in the area of this site include: pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or Triassic Hazelton Group; recrystallized granodiorite of the Triassic Texas Creek Granodiorite, which intrudes the Hazelton rocks; quartz monzonite and granodiorite of the Hyder Quartz Monzonite batholith, which intrudes the Hazelton and Texas Creek rocks; and Tertiary lamprophyre dikes, which intrude all of the foregoing rock units (Buddington, 1929; Smith, 1973, l977; Berg and others, 1988).
The deposit consists of sulfide-bearing quartz fissure veins up to 3 feet thick in (Texas Creek) granodiorite near its contact with Hazelton greenstone, graywacke, and slate (Buddington, 1929, p. 68-71; Byers and Sainsbury, 1956, p. 138; Elliott and others, 1978, loc. 3). The sulfide minerals in the veins are chiefly galena, sphalerite, pyrite, tetrahedrite, and chalcopyrite. Locally, the veins contain lenticular masses of pyrrhotite accompanied by minor chalcopyrite, pyrite, and arsenopyrite; some of the veins contain small amounts of scheelite. Samples of ore from the Olympia and Starboard claims assayed 103-706 oz. Ag/ton, 17-39% Pb, trace to 7% Cu, and less than 1.0 oz. Au/ton. Development work in the early 1900s included numerous surface pits, trenches, and opencuts, and several hundred feet of underground workings (Buddington, 1929). Several, probably small, lots of sorted ore were shipped from the Olympia and Starboard claims in 1916 and 1917.Maas and others (1995, p. 254) suggest that the age of the sulfide-bearing quartz fissure vein deposits on the Olympia 4-6 and Starboard claims (p. 261 and fig. 66) is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district. If so, the age of the deposit is roughly contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.
|Geologic map unit||(-130.047704156214, 55.9927053088797)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Maas and others (1995, p. 254) suggest that the age of the sulfide-bearing quartz fissure vein deposits on the Olympia 4-6 and Starboard claims (p. 261 and fig. 66) is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district. If so, the age of the deposit is roughly contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.|
|Workings or exploration||Samples of ore from the Olympia and Starboard claims assayed 103-706 oz. Ag/ton, 17-39% Pb, trace to 7% Cu, and less than 1.0 oz. Au/ton. In addition to numerous surface pits, trenches, and opencuts, underground workings in the early 1900s included several adits up to 70 feet long on the Starboard claim; adits, raises, and drifts as long as 360 feet on the Olympia claim; and a 25-foot drift on the Nevada claim (Buddington, 1929; Maas and others, 1995).|
|Indication of production||Yes; small|
|Production notes||Several, probably small, lots of sorted ore were shipped from the Olympia and Starboard claims in 1916 and 1917.|
|MRDS Number||A012281; A012282; A012283|
Berg, H.C., 1998, Alaska Resource Data File--Bradfield Canal quadrangle: U.S. Geological Survey Open-File Report 98-327, 181 p.
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000.
Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.
Byers, F.M., Jr., and Sainsbury, C.L., 1956, Tungsten deposits of the Hyder district, Alaska: U.S. Geological Survey Bulletin 1024-F, p. 123-140.
Elliott, R.L., Berg, H.C., and Karl, S.M., 1978, map and table describing metalliferous and selected non-metalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73-B, 17 p., 1 sheet, scale 1:250,000.
Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
Smith, J.G., 1973, A Tertiary lamprophyre dike province in southeastern Alaska: Canadian Journal of Earth Sciences, v. 10, p. 408-420.
|Reporters||H.C. Berg, USGS|
|Last report date||6/28/1999|