In 1877 Ed Schieffelin searched the San Pedro hills for silver despite warnings from soldiers at Fort Huachuca that he would only find his tombstone in land patrolled by the Apache warrior Geronimo. He found silver and jokingly named his first claim Tombstone, but when that vein soon petered out, he kept searching and discovered a second, richer vein. His brother Al Schieffelin called him a “lucky cuss,” giving the Lucky Cuss mine its name. News spread quickly, prospectors poured in, and Tombstone grew into one of the greatest silver camps in the West. Nearly 1,000 tons of silver worth well over one billion in today's dollars were mined there, more than in any other mining camp in Arizona. The Lucky Cuss mine became one of Tombstone's richest, with workings a mile long and 650 feet deep. Wyatt Earp was among those hoping to strike it rich and helped draw a diagram locating his Congress mine on the edge of Tombstone, and the map also shows the water line on Fremont Street over which Morgan Earp reportedly stumbled during the famous Gunfight at the O.K. Corral.