It doesn't mean there was always found gold there. I chased a few myself, only learning through research they were salted by crooks. Gold was filled in shotgun shells, then fired into cave walls. The men would make a claim, then sell it to a investor. The investor would then excavate, finding no more gold, the mine would be abandoned.
Here's some interesting reading of one I tried to authenticate where I lived in Colorado (color red) Spanish
Located about eight miles north of Ward, Allen’s Park could have become a fairly important town. News reports 1n 1897 said “the town was filling up fast with many stores and hotels.” It had plans to become one of the largest towns in the state of Colorado. Shortly after the turn of the century, the mines found to be misled, petered out and that was the end of Allen’s Park Colorado.