The Office of Precious Minerals (OPM) is the arm of the Ministry of Mines and Energy which regulates the marketing of precious minerals within the Republic of Liberia. OPM serves as the official conduit for all precious mineral exports out of Liberia. OPM conducts valuation on precious minerals (Gold and Diamond) to determine export values and associated royalties payable to government revenue. Due to parallel economic impact of the gold and diamond sectors, the Gold and Diamond Appraisal Offices, which operated separately in previous times, were amalgamated in 2004 to establish the Office of Precious Minerals. This department falls under the supervision of a manager whose functions and authority equals that of an Assistant Minister.