Agriculture and timber form the bulk of Ravalli County economic activity. Marcus Daly, one of three Butte copper kings, funded logging operations in the Bitterroot Valley. The lumber was necessary for the Butte copper operation. Recently, more of Ravalli County's economy stems from tourism. The valley borders the Selway-Bitterroot Wilderness and offers a wide variety of wildlife, including some of the few remaining wolverine and wolf populations in the contiguous states. The Lost Trail Powder Mountain ski area is at Lost Trail Pass on the Idaho border on US-93.