SALT LAKE CITY (AP) — A man searching for unique rocks in the west Utah desert near the Nevada state line recently made quite a discovery: a World War II era bomb.

KSL-TV reports that Craig Alvord says the 6-foot long bomb is the best find he's made in more than 50 years or doing what is known as "rock hounding." Alvord notified the Air Force about the bomb.

Though it wasn't found within base boundaries, Hill Air Force Base spokesman Richard Essary says the bomb squad detonated it Tuesday afternoon with C4 plastic explosives. Essary said it appears to be a practice bomb from the World War II era. It may have ended up there because of a test range in the area.