Fidencio Borer, an apothecary in a village on the northern border of Mexico, discovers some old title of a mine in Arizona and decides to claim them. Trying to cross the border is a border guard intercepted by exaggerating in the line of duty. On the way is captured by a tribe of Apaches and is about to be burned alive, but thanks to the Great Head Horse Lying having toothache and learns that the prisoner it can heal, ordered his release on the condition that the cure. Fidencio would take the wheel and gets the eternal friendship of the Chief apache.
Two con men selling phony stock flee to Mexico ahead of the law, where they run into a woman friend from their earlier days, who is now a bullfighter.
Gridley is mining silver from an old Mexican mine and bringing it into the USA thru a passage into his worthless mine. Border guard Rogers suspects Gridley and finally finds the secret entrance to the Mexican mine. He sends Lee Madison for help only to have her captured by Gridley. Trigger brings help that takes care of Gridley's men and now Roy has to rescue Madison.
Sintown is just a deserted ghost town until Vanerpool starts looking for silver. Cookie and Roy's partners put $20,000 into the business only to find that the mine is worthless and Vanerpool is bankrupt. Carol comes out to look for silver to save the company, but does not know that their engineer, named Regan, is crooked and wants all the silver for himself. But only Old Ed knows where the mother lode is located.
The beautiful owner of a silver mine in Mexico asks an employee for help when bandits keep robbing her shipments.
John Bishop discovers a plot to rob a silver mine belonging to his girlfriend Mary's father and, to foil the evildoers, he joins them.
"Iron Mike" Haines (Tom Chatterton), a crooked sheriff, and "Hands" Weber (Roy Barcroft), the town blacksmith, are in cahoots and have been robbing stages, silver mines, etc., and framing innocent ranchers and cowhands with their deeds. They set out to rob the stage and frame Red Ryder (Bill Elliott as Wild Bill Elliott) for it, but the plan backfires and the sheriff is killed. The sheriff's son, Tommy (Jack McClendon), arrives home from college and is given his dad's job, not knowing he was a crook, and swears to get the man who killed him. Weber tells Tommy that Red killed his dad and Tommy sets out to get Red.
The owner of a silver mine, having repeatedly been the victim of the Silver Bandit, sends his clerk Spade Cooley who can neither ride nor fight west to investigate. The Sheriff has been unable to catch the bandit but when Spade finds him he will have to both ride and fight to bring him in.
'The Devil's Miner' tells the story of 14-year-old Basilio who worships the devil for protection while working in a Bolivian silver mine to support his family.
In the rich hill of Potosí in Bolivia there is a silver mine that was the largest in the world. It has been exploited since 1546 with the arrival of the Spanish who enslaved the indigenous people to steal the precious metal. To this day, hundreds of meters underground, the indigenous miners continue to exploit the mine in extremely precarious conditions, Martín Cádiz is one of them; hi works in the depths of the hill and desires that his children do not enter these tunnels of hell.