Wired Magazine writes about the Berkely Pit

Berkeley Pit Lake is about a mile long and half again as wide, rimmed by naked rock walls that gleam white under the sun of big-sky country. The water is oxblood red at the surface, stained by manganese and iron; deeper down, heavy copper compounds turn it the color of limeade. It will burn your eyes, stain your clothes, and desiccate your skin. If you drink it, it will corrode your gullet before it poisons you. A dozen years ago, 342 snow geese made the mistake of overnighting at the lake. They were dead the next morning.