Haunted Gold, 1932

After receiving a cryptic unsigned letter, John Mason and his trusty horse, Duke, travel to a mine, where they befriend Janet Carter, the daughter of a double-crossed miner. As Mason and Carter attempt to figure out why they were both summoned there, they find themselves the targets of frontier outlaw Joe Ryan and his vicious gang. Meanwhile, a mysterious and terrifying ghost appears in the mineshaft with plans of its own. (IMDb)