Unnamed (beach near Yahtse River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au; Ti
Ore minerals ilmenite; gold; magnetite; pyrite; rutile
Gangue minerals garnet; sphene; zircon

Geographic location

Quadrangle map, 1:250,000-scale IB
Quadrangle map, 1:63,360-scale D-1
Latitude 59.8644
Longitude -141.3696
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the present Gulf of Alaska shoreline near the mouth of the Yahtse River. It is 2.3 miles northwest of USGS benchmark Jarl. The occurrence, in section 6, T. 24 S., R. 24 E., of the Copper River Meridian, is sample location 155 of Foley and others (1995).

Geologic setting

Geologic description

Foley and others (1995) collected one beach sample at this location. Spiral concentrate from this sample contained less than 0.028 gram of gold per ton, 0.53 percent titanium, and 119 ppm zirconium. Thomas and Berryhill (1962) collected reconnaissance beach samples (IB001, IB002, and IB004) from this segment of the Gulf of Alaska shoreline that contained trace to small amounts of pyrite, magnetite, ilmenite, zircon, rutile, garnet, sphene, and gold. Their samples from the Icy Bay area a few miles to the west also contained magnetite, chromite, rutile, xenotime, and zircon. Along this segment of the beach, the magnetic fraction of the Thomas and Berryhill (1962) samples contained 5 pounds or less of iron per cubic yard and 0.7 pound of titanium oxide per cubic yard. The non-magnetic fraction contained as much as 4.7 pounds, but mostly less than 1.3 pounds, of titanium oxide per cubic yard.
Geologic map unit (-141.371329419323, 59.8639957605013)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a - beach).
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration Reconnaissance characterization of beach samples has been completed in this area.
Indication of production None

References

MRDS Number 10307626
Reporters Travis L. Hudson
Last report date 12/12/2001