The first stop on our quest is theAppalachian Mountains. Black lines of coal that look like veins are visible in the mountains all around as the region is one of the world’s largest coal resources. You may not think of coal as a treasure but it’s often referred to as “black diamonds” because of its great value. Coal burns well as you may remember from your last barbeque and used to produce over 40 percent of the world’s electricity make steel and manufacture cement.