Chief Executive Terence Holohan and two other employees have been detained by government officials in Mali, where the Australian company runs gold-mining operations.

Shares in Australia’s Resolute Mining Ltd. plunged more than 30% on Monday after the gold producer confirmed Chief Executive Officer Terry Holohan and two other employees were unexpectedly detained in Mali late last week.

CEO Terry Holohan, along with two other company executives have been detained by the military-led government in Mali. What Happened: The executives traveled to Bamako, Mali's capital, for meetings with local mining and tax authorities to address concerns over the company's in-country practices.