The Hart Mountain horses were gathered from the Refuge in 1998 as part of a complete removal of wild horses from that area by the Fish and Wildlife Service. These horses were rounded up on horseback as opposed to helicopter.
The horses are diverse shades of roan, bays, and chestnuts. Hart Mountain is very close to Beatty’s Butte where the famous Kiger Mustangs were discovered. The Kigers display a lot of old world Spanish Barb markings and conformation. Some of the horses captured off Hart Mountain also have strong Spanish Barb characteristics.