Ona was at one time employed by
Bougainville Copper at the mine, but he became increasingly critical of its operations' adverse effect on the environment and what he claimed was the low level of royalties paid to the landowners. Most of the profits left Bougainville Island, but its society was disrupted by thousands of workers from Papua New Guinea, as well as Australians. From the mid-1980s, Ona and others challenged the leadership of the Panguna Landowners Association (PLA), claiming they were not representing the interests of all the traditional landowners. By early 1988, Ona and his associates, including his cousin
Pepetua Serero, had formed the New PLA, supported by both mineworkers and the traditional opponents of the Panguna mine,
Damien Dameng's
Me'ekamui Pontuku Onoring. The New PLA made a number of demands, including monetary compensation for the impacts of the mine, a 50 per cent share of mine revenue to the landholders, and a transfer of ownership to Bougainville. The PNG Government set up an independent inquiry which dismissed the claims about the environmental impact but was critical of other parts of the mine's operation. In response, Ona established the
Bougainville Revolutionary Army (BRA), which conducted numerous acts of sabotage against the mine including the destruction of the mine's power supply. The mine was closed by
Bougainville Copper in May 1989. Ona rejected an initial compromise deal by Bougainville Copper and the
Papuan government. Ona became the acknowledged leader of the BRA after the death of Serero in 1989;
Sam Kauona, a former soldier in the army, led military operations. The Papuan government sent in the police and then the army under
Jerry Singirok to quell the uprising, but they were unable to do so. The island was placed under a
State of Emergency under the control of the PNG Police Commissioner. The number of complaints increased about human rights abuses by PNG forces, which initially strengthened support for the BRA. In January 1990, Bougainville Copper announced they were suspending operations at the mine. The PNG Government announced that they would withdraw troops and for international observers to verify the disarmament of the BRA. The police fled fearing for their lives in the absence of the army, and there was an attempted coup in
Port Moresby over the deal. In response to a blockade imposed by the PNG Government later in 1990, Ona said he was the head of the
Bougainville Interim Government and declared independence for the island. The island descended into anarchy, as several armed factions and clans struggled for power with the PNG Government supporting these militias. The BRA leaders fell out with
Joseph Kabui, the Premier of Bougainville, who had previously been a supporter. During Prime Minister
Paias Wingti's term, the PNG Government renewed military efforts and their troops captured
Arawa, the provincial capital, in 1993 and recaptured the Panguna mine.
Sir Julius Chan, Wingti's successor, tried to broker a deal, but neither Ona, the BRA, nor Kabui would sign a deal. Frustrated, Chan ordered a full-scale invasion in 1996 but neither Australia nor New Zealand showed willingness to support it. Chan hired
Sandline International mercenaries, but the military threatened to arrest them on their arrival. Chan resigned to forestall a coup. ==Bougainville ceasefire==