I live in south Louisiana and was hunting yesterday afternoon when I hit on this coin/token in an old area just north of Baton Rouge. The picture on the front is of a prospector and it reads "The Great Louisiana Gold Mine"????? It appears to be made of brass and much larger than a half dollar. On the other side has a $ sign followed by the number 100, then has a serial number. Haven't got a clue??? Any help would be appreciated.