The Owyhee Mountains are an incredible mountain uplands that are still mostly unknow to most climbers. The range was forced up by the Owyhee Batholith 40 million years ago. Some geologists believe that Owyhee Granite is part of the Idaho Batholith, isolated from the main batholith by the passage of the Yellowstone hotspot. Much of the range’s granite is covered by Miocene rhyolite that erupted as a result of a meteorite impact 17 million years ago. The range is surrounded by the younger volcanic rocks of the Snake River Plain, and is still covered in places by extensive deposits of older sedimentary rock. Where Owyhee granite has been exposed to the surface, it has formed impressive outcroppings and an occasional dome.
There is a lot of private property interspersed through out the range. Please read Private Property, the Idaho Code, Trespassing and You by Margo Mandella to help you understand the complications caused by private property.
Most climbers and peak baggers ignore the range because of its long history of mining and its attraction to off road vehicle enthusiast. Yes, there are a lot of mining roads and you may run into a dirt bike but the range is vast, three wilderness areas are enclosed within it’s boundaries and the mountains beyond the Silver City area are wild and usually empty. There are 139 peaks (either named or unnamed in the range. See The Owyhee Mountain Peak list page for all of the peaks. You can also click on the Owyhee Mountains entry for all peaks that I have update since the book came out and, of course, the book has a lot of additional information on the range.