Gold is Ethiopia's main mineral export and has been mined there since ancient times, primarily as alluvial or free gold. MIDROC Gold, one of the subsidiary companies administered under MIDROC Technology Group, acquired the Legedembi Gold mine from the government through privatization for 172 million dollars in 1997. Since 1998 the company has been mining gold and silver from the mine, located in the Oromia Regional State, Guji zone Legedembi locality 500km South of Addis Ababa. The Legadembi Gold mine has an installed annual production capacity of four tons of gold. It was an open pit mine but MIDROC Gold has built the first underground mine in the country and conducted various exploration activities to extend the economic life of the mine. Ethiopian-born Saudi billionaire Mohammed Hussein al-Amoudi owns the mine, which has been in operations for more than two decades. He was the second richest man in the Gulf and one of the Saudi billionaires and royals who were placed under house arrest in Riyadh late last year after Crown Prince Mohammed Bin Salman took swift measures to crackdown on corruption. In January 2018, he was transferred to a maximum-security prison.