Jungle Manhunt

Jungle Manhunt is a 1951 adventure film written by Samuel Newman and directed by Lew Landers. It is an entry in the Jungle Jim series of films starring Johnny Weissmuller. In the film, football player Bob Miller played by reallife footballer Bob Waterfield gets lost in the jungle and is searched for by a female reporter who teams up with Jungle Jim. They subsequently stumble upon a crazed doctor who has been kidnapping villagers to work in a radioactive mine, where he has discovered a way of making diamonds out of mineral rocks.

Source: Wikipedia