Nice chip set BTW. The CA. mine opreated from 1870 to 1902 and reached a depth of 2500'. It is located in Nevadaville, CO 1/2 mile due SW from Central City and shares a wealth of mining/Colorado history. It is almost a ghost town now but boasted a pop. of 2700 around 1865 a larger town in CO at that time.
The mine in the 1880's