turquoise hill resources ltd said wednesday that a federal court in new york has dismissed all claims against the company and certain executives of deliberately mislead investors about the costs and progress at its mine in mongolia the claims were first made against the company and three current or former executives in a putative class action lawsuit in october 2020 backed by one of its largest shareholders pentwater capital management lp on sept 2 a federal judge issued a ruling granting turquoise hills motion to dismiss all of the claims ruling that they werent adequately pleaded and failed to state a claim for relief pentwater as lead plaintiff in the case had alleged that the company and three of its executives violated us securities laws by making false or misleading statements about the progress and expected cost of the development of the oyu tolgoi underground mine