 Nugget Clark has been having his stagecoaches wrecked and Marshal Rocky Lane arrives to investigate. The foreman of a nearby mine is stealing part of the mecury output and selling it in Mexico. Nugget s house has a direct pipeline from the mine and they are trying to drive him into bankruptcy to obtain his ranch. Rocky is quickly aware that the Foremen is behind Nugget s holdups but they are also onto Rocky when he accidently drops his badge during a fight.