Mineral investigations in the Ketchikan Mining District, Alaska, 1990: Southern Prince of Wales Island and vicinity--preliminary sample location maps and descriptions.
Maas-KM; Still-JC; Clough-AH; Oliver-LK
Juneau, AK: U.S. Department of the Interior, Bureau of Mines, OFR 33-91, 1991 Jan; :1-139
The U.S. Bureau of Mines began a 5-year study of the 7.0-million- acre Ketchikan Mining District during 1990. This study is part of the Bureau's ongoing statewide mining district evaluation program. The study area was subdivided and then prioritized by mineral potential into work units. Bureau field work in 1990 focused on the southern portion of Prince of Wales Island and vicinity. Extensive mineral resources have been mined historically in the area and are presently being evaluated by private industry. Information in this report is based on an extensive literature search and Bureau field work. Over 150 mines, prospects, and mineral occurrences were visited in 1990; an aggregate of 1,300 rock, placer, and limestone samples were taken; and nearly 3 miles of underground workings were mapped. Many prospects, some untouched for more than 80 years, were mapped and sampled. High metal values at several prospects were confirmed by Bureau sampling. Reconnaissance sampling along logging roads on Southern Prince of Wales Island revealed mineralized areas not previously recorded. Followup work at many locations is planned for the 1991 season.
Mineral-deposits; Resource-potential; Resource-development; Geologic-surveys; Mines-excavations; Mining; Geochemistry; History; Maps; Tables-data; Precious-metal-ore-deposits; Sampling; Exploration; Resource-assessment
Juneau, AK: U.S. Department of the Interior, Bureau of Mines, OFR 33-91