National Geographic : 1953 Dec
851 Andrew II. Brown, National Geographic Staff Engineers Diverted a River and Drained a Lake to Get Steep Rock's High-grade Iron Removal of lake-bottom clay and rubble, beginning in 1944, has uncovered one of North America's outstanding iron ranges. Open-pit operations already have yielded nine million tons; now underground mining has begun. This electric shovel takes 7-ton bites. Lake water formerly lapped just below the spruce trees (page 849).