(May 22, 2018, 1:21 PM EDT) -- WASHINGTON, D.C. — An ad hoc committee of the International Centre for Settlement of Investment Disputes (ICSID) on May 18 issued a decision in an arbitration filed by investors in mining concessions, rejecting an application made by the Plurinational State of Bolivia to annul a $48,619,578 award (Quiborax S.A., et al. v. Plurinational State of Bolivia, ARB/06/02, ICSID)....