Whenever it shall appear that any person is engaged, or is about to engage, in any act which constitutes or will constitute a violation of subsection (a) of this section, the Attorney General may institute a civil action in the district court of the United States for the judicial district in which the defendant resides or in which the violation occurred or in which the lease or land involved is located, for a temporary restraining order, injunction, civil penalty of not more than $100,000 for each violation, or other appropriate remedy, including but not limited to, a prohibition from participation in exploration, leasing, or development of any Federal mineral, or any combination of the foregoing.