Pour marks progress towards commercial production targeted for the first quarter of 2021.
The remote Grasberg mine will be powered via a 100km transmission line.
Canadian mine is refurbishing concentrator
Operation has been on care and maintenance for about nine months.
California operation will be a 'long-life' asset, owner said
Hemlo openpit has been mined since 1989 and has produced over 2.8 million oz gold.
Miner wants to significantly reduce the risk to the mine of any further deterioration in the grid.
Hybrid grid aims to reduce operating costs and carbon emissions.
Mexus Gold's ball mill is now operational in Mexico.
Buttresses are already in place to support weaker wall area.
Analyser allows real-time concentration measurement of gold, PGMs, other metals in process streams.
The vertical grinding mills will be the largest of their kind installed in Australia.