In classic "Kung Fu" fashion, Caine's presence in the mine redefines what it means to be in prison. After a (pretty cool) scuffle with some guards, Caine and fellow miner Meador (Don Dubbins) are punished by being placed in "the Oven," a tin shack that's unbearably hot during the day and just as cold at night. Caine survives this by meditating, and he teaches Meador to do so as well. "You are not within a prison. The prison is within you."
There's a great flashback scene with Master Po. Young Caine, curious about a locked hallway at Shaolin temple, is commanded by Po to brave it. He learns that the hallway is locked because it leads to a pool of acid where metal is electroplated, and Po wants Caine to traverse a beam over this acid pool. Looking down, Caine sees the bones of monks who have tried this and failed. Po is trying to teach Caine what Caine will later try to teach the miners about the "cursed" mine. "Superstition is like a magnet. It pulls you in the direction of your beliefs."
Ultimately, Caine's revolutionary ideas, his ability to inspire the men to shift mentally, lead to renunciation of the curse, cooperation and revolution. As is so often with this show, beating up the bad guys is not an option. Rather, Caine points the way, helps it along.
Veteran character actors round out the cast; Fred Sadoff of The Poseidon Adventure as corrupt sheriff Banack, Ford Rainey as mine owner Stern, and stuntman and character actor Roy Jensen as Rupp, one of the mine's potential leaders. Four out of four yin-yangs, IMDB is here. YouTube here.