How many 2002 Bowman Chrome Gold Refractor Autograph Joe Mauer
baseball cards were made.

According to the Beckett Baseball Card Monthly price guide Vol. 20,
No. 2, Issue #215, the 2002 Bowman Chrome Autographed Gold Refractor
of card #391 of Joe Mauer was produced in a run of 50 numbered cards. 
The odds of pulling it, or a similar Bowman Chrome Autographed Gold
Refractor numbered from 384-405, is 1 in 879 packs.  The cards maximum
book value in the same issue of Beckett is listed at $400 in mint
condition.  Hope that helps.