This can include lumbering, ranching and farming, land speculation, oil prospecting and mining, and poaching. This was also the beginning of geological prospecting, mining, and local lead production. The Lone Prospector gets lost in the same blizzard while also prospecting for gold. Oil prospecting with geological survey, structure drilling, seismic prospecting and preliminary drilling started in 1945. Hearst switched to prospecting and dealing in quartz mines. The success of the Schuyler mine led to more prospecting and discovery of more deposits. Knowledge of previous prospecting in an area helps in determining location of new prospective areas. They were miners who had been prospecting at Bear Valley. Similarly, it has found some limited use in prospecting for geothermal gradients. D'Arcy hired geologist George Bernard Reynolds to do the prospecting in the Iranian desert. The two men earned a living by hunting and prospecting. It also revamped several of the game's key systems, including prospecting and harvesting. He returned to prospecting in the hopes of finding success. Gold prospecting along the Jinsha continues to this day. Most had no previous experience in gold prospecting or of life in the bush.