Bonanza (1959)

S2E30 The Thunderhead Swindle

Title: The Thunderhead Conspiracy Plot: As Virginia City teeters on the brink of financial disaster, unemployed miners cling to rumors of a newfound silver strike in a mine previously deemed unproductive. Ben, however, has a hunch that the mine's new proprietors have been pilfering silver from a nearby mine also believed to be exhausted. Determined to uncover the truth, he sets out to gather evidence and expose the deception.