Diesel Law Exam No. 5 Questions taken from the Pennsylvania Bituminous Mine Officials Exam Study Guide Progress Indicator: Question 2 of 15 2.  In some remote locations, such as Papua New Guinea, mine waste has contaminated local rivers and coastal fishing areas.  What is the source of the contamination?  Need Help? Choices: Mines disposing of mine waste into rivers Trucks overturning and spilling cyanide into rivers Dams full of mine waste leaking cyanide and heavy metals into rivers