Man is dipped into a vat of gold

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The trick is not minding
Early to mid 1980’s film. I only recall the beginning of it. Some man has been caught by some jungle savages and has had his mouth sewn shut. He is hung upside down and his head is dipped into a vat of liquid and boiling gold. After he is removed the crack his head off of his body.
I can’t recall any stars in it, so any help is appreciated. Thank you in advance.