Trevali Announces Positive PFS For Rosh Pinah Mine Expansion (“RP2.0”); Increases Production Capacity by 86% and Significantly Reduces Operating Costs VANCOUVER, British Columbia, Aug. 25, 2020 (GLOBE NEWSWIRE) -- Trevali Mining Corporation (“Trevali” or the “Company”) (TSX: TV, BVL: TV; OTCQX: TREVF, Frankfurt: 4TI) is pleased to announce...