KoBold Makes Offer for Congo Lithium as Country Courts US, page-899

He's not wrong though. The DRC often invokes sovereign immunity to avoid paying judgments or allowing the seizure of state assets.

The DRC government revoked First Quantum’s rights to the Kolwezi tailings project in 2009.Outcome: After legal arbitration and international pressure, First Quantum was awarded over $1.25 billion in damages in 2012, but payment was never made.

There are no less than 7 examples of this taking place with other miners. AVZ is number eight. You're no more special than the rest chasing their tails trying to squeeze one of the most corrupt places on earth.

good luck, you'll need that and unlimited patience.