Ordeal (1973)

In the company of his wife Kay and Andy Folson, their guide, Richard Damian ventures on horseback into the desert with a view to locating a manganese mine he intends to buy. Unable to bear the rigors of travel, Richard has a violent altercation with Kay. Frightened, his horse rears up and makes him fall into a ravine. Richard, who realizes his leg is broken, asks for help but Kay and Andy decide to abandon him to his fate...