I did watch the 1958 film "Manhunt in the Jungle" this morning (October 20 2017) on TCM cable and thought it was a good film.
It is 79 minute long and was "Photographed entirely in the Amazon Country of South America".
Col. Fawcett disappeared in the Brazilian jungle in 1925 while searching for the "Lost City", in the film called "El Dorado".
The film is based on George M. Dyott's book Man Hunting in the Jungle
, published in 1930.
In 1928 Cmdr. George M. Dyott takes a small expedition, financed by American newspapers, to locate either Fawcett, El Dorado, or both.
He recruits some men from the last town. One of the men takes Dyott to see his wife, who has psychic powers. She tells Dyott that Fawcett was killed by Indians and to beware of something called "E. T.".
Dyott's group encounters deserts, rivers, and assorted wildlife.
Of course there have to be snakes.
They finally encounter a tribe of Amazonian Indians.
He finds some of Fawcett's items in an Indian camp and an Indian chief tells him about a pile of stones which could be the lost city and that Fawcett's group was murdered by Indians.
He suspect that the Indians visiting his group killed Fawcett are about to massacre his group.
The expedition leaves without visiting the lost city but Dyott considers it a success because they found out what happened to Fawcett.