Chilean miner #21 was rescued moments ago -- but his problems have just begun -- because his wife wasn't there to greet him when he made it to the surface ... rather, his mistress. Awk-ward.

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According to reports, 50-year-old miner Yonni Rojas was greeted by mistress Susana Valenzuela at the San Jose Mine in Chile today -- while his wife of 28 years opted to stay home.