The agreements signed between the State and New Porgera Ltd include the Mining Development Contract, Special Mining Lease 13, Fiscal Stability Agreement, and Escrow Arrangement for landowners.
Prime Minister James Marape has hailed the signing as a "giant leap" towards the reopening of Porgera gold mine.
The mine is expected to commence operations before the end of the year, with full production anticipated within six months, contingent upon the finalisation of compensation agreements for landowners.