The Flintstones - Season 6 - Eps 19: The Treasure of Sierra Madrock
Two con artists posing as gold miners sell Fred and Barney phony mine. Wilma and Betty find out and trick the con artists into buying the mine back, but Fred and Barney, convinced of its value, won't sell. Only the threats of the con men convince them to recover their investment and head back home.
About The Flintstones

Title: The Flintstones
First Air Date: 1960-09-30
Last Air Date: 1966-04-01
Status: Ended
Rating: 7.427/10 (from 924 votes)
Language: EN
Seasons: 7
Total Episodes: 166
Network: ABC
Genres: Family, Animation, Comedy, Kids
Production Companies: Hanna-Barbera Productions, Screen Gems Television
Synopsis
The misadventures of two modern-day Stone Age families, the Flintstones and the Rubbles.
Cast

Alan Reed
Fred Flintstone (voice)

Mel Blanc
Barney Rubble (voice)

Jean Vander Pyl
Wilma Flintstone (voice)

Gerry Johnson
Betty Rubble (voice)

Don Messick
Bamm-Bamm Rubble (voice)