The "Say Hey Kid" spent just 35 games in Minneapolis in 1951, but he left quite the impression. His Batting Average of .477 was impressive - he averaged 2 hits per game played. He also scored more than a run per game. He hit 8 Homers for the Millers before the Giants called him up. Here's an article on his time in MN from a book called Swinging for the Fences: Black Baseball in Minnesota .
The "past year" stats are from his rookie season in New York - the lifetime stats are his time in the Minor leagues (1950 in Trenton and 1951 in Minneapolis).
He's also featured with the Millers on a card from the Ted Williams Company. Ted also had a brief stay in Minneapolis.