Copper Streak Trail by Eugene Manlove Rhodes
The story concerns a shrewd, good-humored old-timer, Pete Johnson, and stalwart young Easterner Stanley Mitchell, who together have found a rich deposit of copper, and must get hold of the necessary capital to develop it into a mine. Certain other parties, though, are bound and determined to block their efforts and track them to the location of the mine so as to jump the claim. On the basis of recurring, odd misfortunes that have befallen Stan since he came West, Pete suspects that he has an enemy back east who is employing their local enemies in Arizona. After Stan is framed for a crime, Pete heads east himself to sniff out the truth and take steps to checkmate the unknown enemy.