Final answer:
The original Forty-Niners and later companies ran the gold mine at Stagecoach Pass.
Step-by-step explanation:
The gold mine at Stagecoach Pass was run by the original Forty-Niners and later by companies. The Forty-Niners were individual prospectors who sifted gold out of the dirt and gravel through panning or by diverting a stream through a sluice box. The placer gold, which was quickly exhausted, was then replaced by companies that could afford to purchase hydraulic mining technology.