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This report is one part of a folio of the Mount Hayes l:250,000-scale quadrangle, Alaska. Known metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines in the Mount Hayes quadrangle, eastern Alaska Range, Alaska, were studied as part of the geologic and mineral resource assessment investigations of the quadrangle. These investigations are part of the Alaskan Mineral Resource Assessment Program (AMRAP) of the U.S. Geological Survey. Data on mineral deposits and mineral occurrences were gathered mainly by (1) detailed geologic mapping of the quadrangle at a scale of 1:63,360; (2) sampling of bedrock, altered, and mineralized areas in the quadrangle; (3) detailed geologic mapping and sampling of selected mineral occurrences, mineral deposits, prospects, and mines; (4) detailed petrologic analysis of thin sections of host and mineralized rock samples and of polished thin sections of sulfide and oxide samples; and (5) literature compilation. The purpose of this report is to provide a detailed summary of the known metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines in the Mount Hayes quadrangle as of the time of publication. This summary is an essential data component for assessing the mineral resource potential of the quadrangle. The major parts of this report are (1) a map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines; (2) three tables that summarize the important details of the metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines; and (3) this text, which contains a list of previous studies; an explanation of the tables; definitions; a general bedrock geologic summary of the quadrangle to guide the reader in the interpretation of the data; a summary of the principal types of deposits in the quadrangle; a summary and interpretation of the lode and placer mineral occurrences, mineral deposits, prospects, and mines; and references. A generalized bedrock geologic map of the Mount Hayes quadrangle is part of the screened base used for the location of metalliferous lode and placer occurrences, deposits, prospects, and mines (see accompanying map sheet). A simplified version of this map (fig. 1) serves to guide the reader in the bedrock geologic summary given below. This report is one part of the mineral resource assessment folio on the Mount Hayes quadrangle. Other portions of the folio provide detailed data and interpretations of the exploration geochemistry (Curtin and others 1989), and assessment of mineral resource potential of ft", quadrangle (Nokleberg and others, 1990).

miscellaneous field studies map

Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes Quadrangle, eastern Alaska Range, Alaska