Aluminij, based in Bosnia's southern town of Mostar and one of the Balkan country's biggest exporters, has been in trouble for years over heavy debt accumulated because of high alumina and electricity prices.
Investors with a combined $12.5 trillion in assets could review their stakes in resource companies that use storage dams if they do not release information to assess safety risks.
Numerous reports from state-run Chinese media have raised the prospect that China may limit its supplies of the minerals to gain leverage in its trade dispute with the US.
Informal methods of gold production, known as "artisanal" or small-scale mining, have grown rapidly in recent years as demand for gold has boomed, pushing prices higher.
Barrick must either firm up its proposal to acquire the 36.1% of Acacia it does not own by June 18, or walk away for at least six months under British takeover law.