Hoppy, Lucky and California search for a mine owned by Trudy Pendleton after it was taken from her by thw swindling gambler Ace Gibson. They find the mine and Hoppy fights Gibson over it.

William Boyd
as Hopalong Cassidy

Russell Hayden
as Lucky Jenkins

Andy Clyde
as California Carlson

Eleanor Stewart
as Trudy Pendleton

Morris Ankrum
as Ace Gibson

William Haade
as Bill Watson

Dennis Moore
as Jud Carter

Henry Hall
as John Blake

Britt Wood
as Ben Pendleton

Silver Tip Baker
as Barfly