{"nrhp_refnum":"10000157","name":"Davis Mill","other_names":["Randolph Quartz Mine Millsite","Blm# Ca-018-Yn-26"],"category":"building","location":{"address":"off North Bloomfield Road; 3 miles NE of Nevada City","address_restricted":false,"city":"Nevada City","county":"Nevada County","state":"CA","lat":39.29034713000004,"lon":-120.98928725999997,"geom_source":"nps_gis"},"listed_date":"2010-04-01","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Industry"],"significance_levels":["local"],"summary":{"what_it_is":"A multistory wood-frame stampmill clad in corrugated metal, built between 1915 and 1920 on federal (BLM) land about three miles northeast of Nevada City, Nevada County, California, to process gold ore from the Randolph Mine.","why_significant":"The mill is presented as a well-preserved legacy of a small family-run gold mining operation, which was an important theme in local and regional history (Criterion A, Industry). It is also described as an outstanding example of stampmill vernacular, with distinctive type, period and construction characteristics (Criterion C, Architecture). Much of its original equipment, including the stamp battery and motor, remains in place.","narrative":"Three miles northeast of Nevada City, California, on land managed by the Bureau of Land Management, a corrugated-metal-clad stampmill climbs down a hillside in several levels. Built between 1915 and 1920 for the Davis family, it processed gold ore from their Randolph Mine. The family leased the mine to a mining company in the late 1920s, and the mill may have handled ore from other mines intermittently in the late 1930s before standing idle by the Second World War. Ore entered at the top and moved downward by gravity through the grizzly, ore bin, crusher, five-stamp battery, amalgamating table and concentrators. The crusher, belts and concentrators are gone, but the locally made stamp battery, electric motor, ore bin and retort room remain in place. Most original framing, siding, doors, flooring and stairs survive, and the forested setting resembles its early appearance. The mill was listed for its place in small-scale gold mining history and as an outstanding example of stampmill construction. Recent repairs have kept the building sound and open to visitors.","period_of_significance":"Circa 1915-1940","architect_builder":null,"architectural_style":"No style (stampmill vernacular)","criteria":["A","C"],"status_note":"Described as in excellent condition and accessible to the public after BLM repairs to the roof, windows, stairs and floors; some equipment such as the crusher and concentrators was removed, probably in the 1940s and 1950s.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.693886-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/10000157.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123860126","wikipedia":"https://en.wikipedia.org/wiki/Davis_Mill_(Nevada_City,_California)","wikidata":"https://www.wikidata.org/wiki/Q19461283"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/nevada-county/davis-mill-10000157/"}