One of the most famous lost mines in California is known as the Lost Dutch Oven mine. There are several versions of the story, as is the case with other lost mine legends, perhaps the best known is the one in which a railroad worker named Schofield decided to do some prospecting in his time off. According to this version, somewhere in the Clipper mountains northwest of Essex (in Bernardino county) he found an old stone house. It appeared to be long abandoned so he continued on, and some miles further on he found a spring. Near the spring he spotted an old trail, so he followed it; the trail led him up over a hill, and he spotted a huge boulder that was split in two. The path went through this split boulder, and into what he believed was an ancient Spanish camp.
I am paraphrasing here, but basically he found pieces of ore and tripped over an old rusted Dutch Oven. The Dutch Oven on being tipped, spilled out handfuls of gold nuggets! Schofield filled his pockets with as much gold as he could carry and went back to "civilization" where he celebrated his good fortune in the old-fashioned way.
The upshot of the story is, Schofield, on having celebrated up all of his gold, returned to the Clipper mountains to get more gold and could not find the mine again! He could not even find the trail. Others have sought this mine unsuccessfully over the years, as Schofield gave enough details in the topography that it seems as if it would be easy to find it again.
The story has been published in many magazine articles and treasure books; there are a number of articles online as well. Here are a few links;
http://www.legendsofamerica.com/CA-LostMines.html#Dutch%20Oven%20Mine%20of%20San%20Bernardino%20Countyhttp://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/treasures74.htmlhttp://www.dustyway.com/2009/05/tom-schofields-lost-mine.htmlThis lost mine ought to be find-able; the old stone house (or cabin) may still stand, though the trail and spring may be difficult to locate, often wildlife and livestock will keep a trail in use enough that it can be followed even after a century of no human use. The Clipper mountains includes a Wilderness Area so if the mine turns out to be within the boundaries of the Wilderness, you may not be able to file a mining claim on it, at least not in the normal way. But as rich as it is supposed to be, you should be able to mine it even with hand tools and make a tidy profit.
Good luck and good hunting amigos, I hope you find the treasures that you seek.
Oroblanco