Mining executives argued for a sharper industry focus on economic solvency, environmental accountability and public perception at a London event this month.
Bougainville President Ishmael Toroama is seeking international investors to re-open one of the world's biggest copper mines, with Marape backing his authority on Wednesday.
A fast-track approvals Bill to reduce permitting from two years to six months for mining projects has ushered in a new era of bustling exploration activity amid fierce competition.