The Mountain of Gold / by Max Evans; Hugh Cabot, III

Norman Berg, 1965. Black cloth boards with gold titles. Slightly-tilted spine. Dustjacket clipped at inner front, top and bottom. VG/VG. In mylar cover. 

the story of Benito Anaya and his wife Eloisa. While cutting wood on Black Mountain, Benito finds a nugget of gold the size of his fist.