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.

Directed by: Lesley Selander
Written by: Arnold Belgard
Runtime: 70 minutes
Tagline: CASSIDY MOPS UP THE MESA...to win a goldmine and avenge a girl!
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Cast:
William Boyd William Boyd
Hopalong Cassidy 
Russell Hayden Russell Hayden
Lucky Jenkins 
George 'Gabby' Hayes George 'Gabby' Hayes
Windy Halliday 
Walter Long Walter Long
Pierce 
Gwen Gaze Gwen Gaze
Ann Dennis 
William Duncan William Duncan
Buck Peters