Months after a Brooklyn federal judge found that the former shareholders of a Canadian mining company are owed restitution after losing money in a bribery scheme in the Democratic Republic of the Congo, federal prosecutors agreed that the lost mining rights may be worth up to $190 million.

The estimate represents progress toward being made whole for the clients of Wilson Sonsini Goodrich & Rosati, though a mining valuation expert estimated that their company’s share of the mine could have been worth as much as $1.8 billion if it had been developed.