Jim Randall, both a Marshal and a geologist, arrives to try and find out who's been robbing the ore shipments. He eventually figures that Parker is robbing the other miners and then selling the ore as his own. Jim has some high grade ore shipped. When it is robbed and Parker brings some ore he expects to find the high grade. But Parker fools him and brings low grade. Then he kills the mine owner and blames Jim amd a lynch mob is soon after Jim.