Lihir Island is on the Rim of Fire. Not much chance of an eruption, although earthquakes are par for the course in that region. My fear would be a tsunami that rolled up the shores and took out LGL's facilities.I Lihir does have a bit of risk associated with it though...the countries and surroundings it operates in aren't the most sound and secure. What if the volcano explodes? Mmm.
Aside from that, in the gold mining game a greater risk is a team of turkeys at the helm, such as befell Croesus and the mob in WA that had the gold/tantalum mine (forgot their name- sorry).