Nevada's founding lost-mine story: around 1864 Jacob Breyfogle staggered out of the Death Valley and Amargosa country half-dead, carrying ore so rich it started a verb, to go Breyfogling. He led party after party back into the desert east of Death Valley and never relocated the ledge; men kept Breyfogling for a century. Some hold the Johnnie district finds were his ledge, most hold it is still out there.
Amargosa country east of Death Valley (Nye County, NV)
See it on the map
No single published account; the story is carried locally.