This primary source comes from the Records of the U.S. Mint.
National Archives Identifier:
296582Full Citation: Photograph of the entrance to the Golden Rule Mine in Tuolumne County, California; Records of the U.S. Mint, Record Group 104. [Online Version, https://www.docsteach.org/documents/document/photograph-of-the-entrance-to-the-golden-rule-mine-in-tuolumne-county-california, March 28, 2024]