Thunder Mountain is a 1947 film. It was the first of Holtspost war Western star vehicles and the first in a series of Zane Grey adaptations he made for RKO. It was also the first film of his written by Norman Houston who would go on to writemore for the star.
The film was made for a relatively high budget for a B Western. This was partly responsible for it making a profit of only 17,000.
Source: Wikipedia