Read the bilateral treaty and you will see that revoking our MOC based upon a new mining law would fall under the section prohibiting expropriation and would make the arbitration go very quickly:

"Investments or returns of investors of either Contracting Party shall not be nationalized, expropriated or subjected to measures having an effect equivalent to nationalization or expropriation (hereinafter referred to as "expropriation") in the territory of the other Contracting Party, except for a public purpose, under due process of law, in a non-discriminatory manner and against prompt, adequate and effective compensation. Such compensation shall be based on the genuine value of the investment or returns expropriated immediately before the expropriation or at the time the proposed expropriation became public knowledge, whichever is the earlier, shall be payable from the date of expropriation with interest at a normal commercial rate, shall be paid without delay and shall be effectively realizable and freely transferable."

Article 7, § 1