It's all like gold fever and the rush to get rich quick. Once upon a time when gold or silver was found everyone and their brother rushed to seek their fortune and most often it ended in disappointment. First it was the gold and silver rushes, then the oil, and then uranium, etc. Find it and they will come. The mountains of Colorado are full of abandoned mines. My uncle use to have one he visited in his liesure and found enough to pay for his trip plus a few bucks extra. But he kept it secret and it even had an old cabin to sleep in. He found a cash box some old coins and a only slightly rusted revolver under the floor boards of the cabin. It's location died with him even though he always told me he would show it to me someday. He did give me a few rocks with streaks of gold in them and I saw the old pistol. He also told me to be cautious about approaching an old mine as some of them were still being worked by squatters and they had been known to shoot at interlopers. Monty