Amazon

Prospects, Undetermined

Commodities and mineralogy

Main commodities Au
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-1
Latitude 55.13906
Longitude -132.05258
Nearby scientific data Find additional scientific data near this location
Location and accuracy According to Maas and others (1995), the Amazon prospect is about 0.3 mile east-southeast of the mouth of Paul Lake and about 0.3 mile northeast of the center of section 6, T. 78 S., R. 89 E. Their location is used in this record. Wright and Wright (1908, figure 18) place it about 0.3 mile to the north, but that location is suspect in view of their somewhat generalized, small-scale map.

Geologic setting

Geologic description

As described by Wright and Wright (1905, 1908), the Amazon prospect is a quartz-breccia vein 5 to 10 feet thick that is conformable with the bedding in calcareous schist. The workings consisted of an inclined shaft 125 feet deep with 30-foot drifts to each side of the 50-foot level. There is no record of work after 1916. Maas and others (1991) located a flooded shaft, a dump, and exposures of the vein at the surface. Three samples, dump material, rubble at the shaft, and an outcrop of the vein, contained 4,455 parts per billion gold to 0.272 ounce of gold per ton. Houston Oil and Minerals drilled at or near this prospect in the early 1980s (Oliver and Adams, 1984).
The vein cuts rocks of the Wales Group of Late Proterozoic and Cambrian age (Herreid, 1967). The Wales Group rocks are folded into a large dome centered over the eastern third of Paul Lake, and consist of several marble layers 200 to 1300 feet thick, interbedded with calcareous chlorite schist and marble.
Geologic map unit (-132.054250420569, 55.1387042245554)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Vein is younger than the Late Proterozoic or Cambrian host rocks.

Production and reserves

Workings or exploration The workings consisted of an inclined shaft 125 feet deep with 30-foot drifts to each side of the 50-foot level. Houston Oil and Minerals drilled at or near this prospect in the early 1980s (Oliver and Adams, 1984).
Indication of production None

References

MRDS Number A010060

References

Oliver, D.H., and Adams, J.B., 1984, Dolomi gold project, progress report: Houston Oil and Minerals Exploration Company, 41 p. (Unpublished report held by the Bureau of Land Management, Mineral Information Center, Juneau, Alaska.)
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004