Indirect expropriation
Arbitrary, unreasonable and/or discriminatory measures
Umbrella clause
https://www.iareporter.com/arbitration-cases/congo-mining-midus-holdings-v-congo-brazzaville/ (requires subscription)
https://globalarbitrationreview.com/congo-faces-yet-another-mining-claim (requires subscription)
https://www.iareporter.com/articles/the-republic-of-congo-is-faced-with-yet-another-notice-of-dispute-over-revoked-iron-ore-permit/ (requires subscription)