Gogebic Taconite President Bill Williams and two others are accused of mismanaging and polluting groundwater at the large copper mine in southern Spain.
Williams is the former water director at Cobre Las Cruces mine, an open pit mine and processing plant near Seville.
A law firm retained by the mine's owners said Friday it believes Williams and the two other managers named by Spanish prosecutors will be cleared.
Gogebic is proposing to build a $1.5 billion iron ore mine in Ashland and Iron counties.
Williams declined to comment to the Milwaukee Journal Sentinel on the legal proceeding.