 They track the source up the Sweetwater River to Willow Creek and then the hills around that water source. They find this huge quartz vein on the surface with gold embedded in it. And these soldiers are ecstatic and they start mining this gold and they eventually go back to Fort Bridger and start bragging to all their friends about how much gold they found. And word spread quickly. The following year they come back and there's 2,000 people all trying to get rich just like they did. Soon a town named South Pass City came to life with over 2,000 residents.