This collection chiefly contains the professional papers of California mining engineer and consultant Harley A. Sill (1885-1964), reflecting his visits, reports, and technical data on various types of mines chiefly in California, Arizona, Nevada, Canada and Mexico, as well as some mines in other parts of the United States and in South and Central America, primarily in the 1920s to 1950s.

Harley A. Sill (1885-1964) was a California mining engineer and a consultant who visited and wrote reports on various types of mines throughout the western hemisphere particularly in California and the American West. Sill also completed reports from such diverse locations as New York, Canada, and portions of South America. He died in Inyo County, California, on December 17, 1964.

Approximately 1,445 pieces in 15 boxes + 1 oversize volume.

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