History has left us a classic image of western mining in the grizzly forty-niner squatting by a clear stream sifting through gravel to reveal gold. What this slice of Western Americana does not reveal, however, is thousands of miners doing the same, their gravel washing downstream, causing the water to grow dark with debris while trout choke to death and wash ashore. Instead of the havoc wreaked upon the western landscape, we are told stories of American enterprise, ingenuity, and fortune.The General Mining Act of 1872, which declared all valuable mineral deposits on public lands to be free...