The High Chaparral (1967) : 3x4

After accidentally uncovering a silver deposit, an excited Buck Cannon wastes no time in talking Manolito into joining him in a major real estate investment. Unable to raise the down payment to Jeff Patterson, who has agreed to sell his ranch, Buck invites Manolito to be his financial backer for half-interest. After Victoria has turned over a priceless necklace to her brother for collateral on a loan, the new land owners learn hat their silver cache is worthless.