The deserted mine contains more than 1 billion tons of ore, according to a study from 2009 — more than the 675 million tons extracted over the 18 years it was open. These deposits look even more valuable given global concerns over copper supplies, due to emerging market demand, depletion of known resources, rising mining costs and limited new discoveries.
https://ramumine.wordpress.com/tag/panguna/
The SMLOLA Leadership Team Wins an Unprecedented Level of Support From its Members on Panguna Progress, page-5
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