In 2001 and 2002, the Bureau of Land Management (BLM) investigators surveyed, mapped or sampled 108 mineral occurrences in the 2.9-million-acre Delta River Mining District, which extends across the Alaska Range from Paxson to Delta Junction, in east-central Alaska. The BLM collected and analyzed 487 rock chip, placer, pan concentrate, and stream sediment samples during the investigation. In addition, the BLM had 264 U.S. Geological Survey (USGS) stream sediment samples analyzed by the inductively coupled argon plasma–atomic emission spectroscopy (ICP-AES) technique for 40 elements and by fire assay, atomic absorption finish, for gold, platinum and palladium. A subset of 17 of these samples, all with high nickel values, was analyzed for the full suite of platinum group elements (PGE).
2001-2002 Fieldwork report:
BLM AK OFR 91 - Mineral Investigations in the Delta River Mining District, East-Central Alaska, '01-'02 (PDF 7.65 Megabytes) BLM AK OFR 91 plates (PDF 19.4 Megabytes)