The number of “For Sale” signs compete with “Open” in the storefronts along the main street in this hilly town, where fortunes evaporated with the silver and zinc mines that created it. There’s no bank or grocery store. Mining has mostly vacated the area, leaving a clutch of retirees, some county workers, and not too many others. But this part of Nevada still has one resource that residents to the south in glitzy Las Vegas desperately want and need – water.