There is an iron rule of resource exploitation: Go after the easy stuff first. If you don't, your competitors will and run you out of business with lower prices. But where do you go when the easy stuff runs out? (And the easy stuff always runs out.) The United States' recent expanded claims to ocean seabeds signals that the easy stuff has run out or will soon. More on those claims later. The obvious answer to getting more resources is to start digging up the harder stuff. Sometimes it's new technology that makes the harder stuff economical to extract. Heap leach mining was developed to take low concentration ores and leach out the…
