Select Mineral Abundancy Data from Alaska Placer and Pan Concentrate Samples Reanalyzed from 2020-2023

Samples from the Alaska Placer Concentrate Collection (APCC) were retrieved from the USGS National Geochemical Sample Archives and submitted for mineralogical analysis at the Colorado School of Mines. The APPC contains samples from placer mining operations throughout Alaska. The original collection contained approximately 5,000 samples that were collected by U.S. Geological Survey geologists between 1895 and 1953 from various mining districts in Alaska (Cathrall, 1993). Much of the collection was lost and surviving samples are housed in the USGS National Geochemical Sample Archive (Cathrall, 1993). Maps showing the sample location and notebooks containing information about the samples in the APCC were retrieved from a Technical Data archive located in the Alaska Science Center in Anchorage. Site locations were digitized from APCC location maps and site information was obtained from the folders that accompany the location maps. Mineralogical analysis was performed on 68 samples selected from the APCC using automated a scanning-electron-microscope (SEM) based mineralogical automated mineralogy system. These data files contain the results of the mineralogical analysis.