The U.S. Geological Survey (USGS) made a reconnaissance geochemical survey of the Blood Mountain Roadless Area to search for unexposed mineral deposits which might be recognized by a geochemical signature in the abundance of distribution patterns of trace elements. Forty five fine-grained stream-sediment samples and 45 panned-concentrate samples were collected in the Blood Mountain study area (fig. 1). A.E. Nelson, in conjunction with detailed geologic mapping, collected 13 rock-chip samples for geochemical analysis, in addition to a large number of hand specimins for thin-section study. Nelson's geologic study (1983), combined with this geochemical survey, provide the basis for our mineral-resource assessment of the Blood Mountain Roadless Area (Koeppen and others, 1983).