Hoppy's friend Dennis owns a rich gold mine. Frazier who owns the adjoining mine and wants the Dennis mine, has Dennis killed. Hoppy steps in to take over running the Dennis mine and learns Frazier's men sneak into and work the Dennis mine at night. Hoppy captures one of Frazier's men only to be captured in return by Frazier and left to die in a burning building.
as Hopalong Cassidy
as Windy Halliday
as Lucky Jenkins
as Ann Dennis
as Buck Peters
as Frazier
as Slade
as Denny Dennis
as Perkins
as Pierce
as Ross
as Miner
as Les Martin
as Evans
as Townsman
as Murphy
as Frosty
as Miner
as Miner
as Fred
as Jim
