Since the 1849 Gold Rush thousands upon thousands of holes, pits, trenches, shafts and tunnels have been dug in search of GOLD. Most of these diggings have shown only a trace of gold, if that. My advice is don't give up, as through the years other very valuable metals and elements have been discovered in these so-called worthless diggings. That is not counting the big five; silver, lead, zinc, copper and gold. Tungsten, uranium, bismuth, tellurium, cadmium, nickel, platinum,