MELBOURNE – Rio Tinto said on Tuesday that it was ready to talk to stakeholders over allegations of human rights breaches at a giant copper mine in Bougainville that it formerly owned, after community members filed a complaint with the Australian government.

"We are ready to enter into discussions with the communities that have filed the complaint," it said, adding it would also speak with current mine owners as well as the Bougainville and Papua New Guinea governments.

The stance marks a change from April, when Rio rebuffed a request by the same group for a review of health and safety concerns at the mine as a starting point for discussion around compensation and remediation.

It also highlights a different approach by Rio to social responsibility, after its destruction of sacred and historically significant rockshelters for an iron-ore mine in Australia in May cost its chief executive and two other executives their jobs.

Rio Tinto subsidiary Bougainville Copper (BCL) ran the Panguna copper and gold mine in Papua New Guinea from the early 1970s to 1990 when it was abandoned during a civil war that was largely fought over how mine profits should be shared.

Rio handed its shareholding in the mine to national and local governments in 2016.

The complaint, backed by 156 community members, was filed on Tuesday to the Australian OECD National Contact Point by Melbourne's Human Rights Law Centre. It alleges that the large volumes of mine waste left behind poisoned water sources, flooded lands and sacred sites, and caused a range of health problems.

Rio said that it was aware of the "deterioration of mining infrastructure at the site and surrounding areas, and claims of resulting adverse environmental and social, including human rights, impacts", despite not having had staff at the mine since 1990.

While global miners have not been forced to account for mines they operated in the past, or those they inherited, they have come under increased pressure from shareholders in the past few years to ensure high standards of responsible mining.

The Bougainville mine - Bougainville Copper - is part listed on the Australian stock market and part-owned both by the Bougainville and PNG governments .

Bougainville, which held an election last week, is in talks with the Papua New Guinea government over its independence.