All have been "discovered" but due to federal regulations very little has been utilized.  Along with gold we have more precious metals in the ground then most of the lower 48 combined.  We also do next to nothing with our timber except watch millions of acres of it burn every year.  All of this is due to federal regulations that are so restrictive that it's currently impossible to make a profit using any of these resources.  We could be selling coal to half  the globe if not for the terrorist and chief's war on our economy in the form of regulations.  We also have more natural gas than the middle east has oil.  Cars can be converted to run off it fairly simply.  There is huge potential there that is mostly untapped.  Hemp production also has limitless possibilities.  Government just needs to get out of the way.