{"nrhp_refnum":"75000176","name":"Wall Street Mill","other_names":[],"category":"building","location":{"address":"S of Twentynine Palms in Joshua Tree National Monument","address_restricted":false,"city":"Twentynine Palms","county":"San Bernardino County","state":"CA","lat":34.03610150100005,"lon":-116.13391495171427,"geom_source":"nps_gis"},"listed_date":"1975-11-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry"],"significance_levels":["local"],"summary":{"what_it_is":"A gold ore stamp mill complex south of Twentynine Palms in Joshua Tree National Monument, San Bernardino County, California. The mill building was erected about 1933 by William F. Keys to house a two-stamp crusher built in 1891.","why_significant":"The nomination argues local technological and mechanical significance under Industry. It is a complete and operable gold ore crushing mill with late-19th-century two-stamp machinery. The significance covers the machinery, the mill building, the well and the well pump, but not the collapsed bunk house or privy.","narrative":"Wall Street Mill is a gold ore crushing complex south of Twentynine Palms, within Joshua Tree National Monument. Its heavy-timber stamp mill sits on a sloping hillside so gravity aids the milling process, with a wooden ramp carrying an ore tramway to the top of the building. Inside is a two-stamp crusher made by Baker Iron Works of Los Angeles in 1891, a Myer concentrating table and a gasoline engine from the Western Gas Engine Company. The machinery first served at Pinon Wells and later passed to Sherwood & Company before rancher and miner William F. Keys bought it in the early 1930s and moved it here. Keys ran it intermittently for about ten years, crushing ore from his own claims and for other prospectors, and reopened it briefly in 1966. It is valued as a complete, operable example of late-19th-century mining equipment. The collapsed bunk house and privy are not considered significant.","period_of_significance":"c. 1933-present","architect_builder":"William F. Keys","architectural_style":null,"criteria":[],"status_note":"Mill building generally in good condition, missing some windows, floor boards and a stair; the bunk house and outhouse are partially or almost totally collapsed. A data sheet notes the property is abandoned and not in use.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.486031-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/75000176.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75000176/3843e12fe4-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75000176/3843e12fe4-1600.webp","licence":"Public domain","author":"Grogan, Brian Related names: Keys, William F Meyers, George Reynolds, Joe Thornton, Bill Wirtz, U C Booth, Oran McInnes, Earl E Oberer, Fred J, Sr Oberer, Fred J, Jr Keys, Willis Heppler, Bob Workman, Bill Smith, Bud Perkins, Mike Krucero, Paulo Braden, Ed Peterson, Chet Ortiz, Frank Fulton Engine Works Baker Iron Works Meyer, John W Phelps, Charles Western Gas Engine Company Connell, Ruth, field team project manager Hardesty, Donald, consultant Delony, Eric, project manager Joshua Tree National Monement, sponsor Park Historic Preservation, Western Regional Office, National Park Service, sponsor","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:ABANDONED_TRUCK_-_Wall_Street_Gold_Mill,_Twentynine_Palms,_San_Bernardino_County,_CA_HAER_CAL,36-TNPAL.V,2-7.tif\" rel=\"noopener\">Grogan, Brian Related names: Keys, William F Meyers, George Reynolds, Joe Thornton, Bill Wirtz, U C Booth, Oran McInnes, Earl E Oberer, Fred J, Sr Oberer, Fred J, Jr Keys, Willis Heppler, Bob Workman, Bill Smith, Bud Perkins, Mike Krucero, Paulo Braden, Ed Peterson, Chet Ortiz, Frank Fulton Engine Works Baker Iron Works Meyer, John W Phelps, Charles Western Gas Engine Company Connell, Ruth, field team project manager Hardesty, Donald, consultant Delony, Eric, project manager Joshua Tree National Monement, sponsor Park Historic Preservation, Western Regional Office, National Park Service, sponsor</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:ABANDONED_TRUCK_-_Wall_Street_Gold_Mill,_Twentynine_Palms,_San_Bernardino_County,_CA_HAER_CAL,36-TNPAL.V,2-7.tif"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123860803","wikipedia":"https://en.wikipedia.org/wiki/Wall_Street_Mill","wikidata":"https://www.wikidata.org/wiki/Q7962621"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-bernardino-county/wall-street-mill-75000176/"}