A massive copper mining proposal in Alaska is once again at the center of a high-stakes legal and political battle, with billions of dollars in potential metals and national security implications on the line. The Pebble Project, located in the Bristol Bay region of southwest Alaska, is described by its backers as 'the largest undeveloped copper prospect in the world.' The project's proponents estimate it contains 80 billion pounds of copper, almost six billion pounds of molybdenum and about 67 million ounces of gold, making it one of the largest known multi-metal deposits globally. The site lies in an environmentally...