By The Sun's Rays part 2 

Mine boss Seymour Hastings (John Davis) suspects an inside accomplice when gold shipments keep getting stolen, so he sends east for help and is sent detective Murdock MacQuarrie (John Murdock). The detective sets out before the next shipment with a posse and finds that his mine clerk (Lon Chaney) is using a mirror to signal the bandits that shipments have left the mine. This Film is in the public domain