Preliminary report of platinum group element occurrences in Alaska

Abstract

Platinum" was reported in placer gold concentrates in early 1900's and "platinum-group metals" were identified In samples collected in the 1920's. b. Quartz Creek N 65' 30' OO", W 161 17' 00" 40 platinum-iron alloy grains picked from placer gold concentrate in 1984 averaged 80 pct Pt and 20 pct Fe. c. Sweepstakes Creek and tributaries N 65' 20' OO", W 161 16' 00" Platinum-iron alloy, osmiridium, chromian spinel, and ilmenite were identified in placer gold concentrates. Concentrate assay indicated 49.6 troy oz/st Pt and 0.350 troy oz/st Pd. The creeks were mined for Au intermittently from 1909-1 965. d. Dime Creek N 65' 12' 23", 161 O, 09' 20" About 10 troy oz in 1916 and thirty-five troy oz PGE were recovered from 7,500 troy oz placer gold in 191 7. The area was mined for Au from 191 5-1 952. PGE and chromite were possibly derived from peridotite body at the head of Dime Creek.