According to this page -
http://en.wikipedia.org/wiki/Porgera_Gold_Mine
EMPEROR MINES LIMITED (EMP) now delisted had a 20% stake in Porgera and being ASX listed you can access old reports for a chosen year here -
http://www.asx.com.au/asx/statistics/announcements.do?by=asxCode&asxCode=EMP&timeframe=Y&year=2006
happy hunting.
