Conversation so far:
What did Joe McGinnity do later in life?
Joe McGinnity purchased the Newark Indians of the Class-A Eastern League (EL) for $50,000 ($1,394,259 in current dollar terms) in 1909 from Frank J. Farrell.
Did the Newark Indians of the Class-A Eastern League do well?
Joe McGinnity's Newark Indians finished second in the EL in 1909 and 1910.
Did Joe McGinnity own the team the rest of his life?
Joe McGinnity played for and managed the Indians through 1912. He sold his interests in the Indians to Ebbets and Ed McKeever and purchased the Tacoma Tigers.
How did Joe McGinnity's Butte Miners do?

Question: How much did he buy the Butte Miners for?
Self-contained rewrite: How much did Joe McGinnity buy the Butte Miners for?