The history of the OTML dates back to 1963 when copper mineralisation was first noticed near the current mine site. Several years later in 1969 the Mt. Fubilan Copper Gold deposit was discovered with feasibility studies and proposals thereafter resulting in Ok Tedi Mining Limited incorporated as an entity to operate the project in 1981.
BHP exited the company in 2002, vesting its interest to Papua New Guinea Sustainable Development Program (PNGSDP) and almost a decade later OTML becomes a fully owned Papua New Guinea company when Inmet Mining shares were bought off by OTML.
In 2013 OTML becomes a state owned enterprise (SOE) when the Government of PNG increased its direct ownership to 87.8 percent.
OTML has a proud history of contributing to the economy of PNG and Western Province.