Most of the time records are kept by county, or archived by the state. I found this phrase explaining the records method on the web site I use to research deaths in Nevada.
Birth and death records from 1887 to the present are recorded in each county, either in the office of the County Recorder or County Health Officer. The Nevada State Office of Vital Statistics has birth and death records from 1911 to the present for all counties
Keep in mind that records and methods / available years will vary from state to state, but I would start at the States Web Page and work my way to the county web pages. If your lucky you may find something, but keep in mind that many deaths were unreported. you may also do some research to see if anyone has written a book about the area/site. many times older writers/books will have some insight or try the closest historic society. As for the mine, you may try looking for the states "Mine and Mineral" site. many times they will list the cords. and you can use map software or gps to pin point. Good luck and have fun.