What is "panguna"

Panguna is a town and a (now decommissioned) copper mine on Bougainville Island, Papua New Guinea. By the end of its operations on May 15, 1989 it was the largest open-cut mine in the world; it was also a major catalyst in the unrest in Bougainville in the 1970s and 1980s ( environmental poisoning due to leaking mine tailings), including the Bougainville Civil War, which lasted from 1988 until 1998.