Live China retaliated with 34% tariffs on US goods, while Trump vows his policies will 'never change.' OTC Markets EXMKT - Delayed Quote • USD Minera Frisco, S.A.B. de C.V. (MFRVF) Follow Compare 0.1000 0.0000 (0.00%) As of April 3 at 4:00:00 PM EDT. Market Open. Sustainability data is currently not available for MFRVF.