I recently visited (last October) the Kennedy Mine in Jackson CA, and it’s an amazing example of US mining in the early 20th century. I bought a copy of a silent movie there which was made in the early 30’s or late 20’s, and it shows some great footage of the works and underground activities. Unfortunately, that film is copyrighted by the museum, and they’ve not posted it to the public. However, this evening I ran across the following documentary which has most of that movie’s clips (just look for the black and white bits).
I also recently read the history of one of the biggest mining tragedies in the US, which happened at the Argonaut mine, practically next door to the Kennedy. (I bought the book when I got the video). So though this documentary has the early Kennedy clips, it is mainly about that disaster in the neighboring mine.
Not RR-related, but some good industrial history for those who might be interested.