Qualla: Steep Rock Lake

Steep Rock Lake: Introduction

Thu, 05 Feb 2026 00:00:00 GMT

Photo credit J. Carragher, CC BY 4.0. In 1891, a Harvard professor named Henry L. Smyth walked the south shore of a sprawling M-shaped lake in northern Ontario and found boulders laced with iron ore. He mapped the north shore and found none. His conclusion was simple and audacious: the iron was under the lake. Nearly half a century would pass before anyone proved him right. In March 1938, Julian Cross drilled six test holes through the bed of Steep Rock Lake and struck a massive body of iron ore. The discovery was confirmed, but the engineering challenge was almost absurd -- to mine the ore, someone would have to drain the lake. What followed was one of the most extraordinary mining operations in Canadian history, a wartime effort that rerouted a river, pumped billions of gallons of water, and turned a pristine lake bottom into an open-pit mine.

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Image: J. Carragher | CC BY 4.0

Steep Rock Lake: A River Forced to Change Course

Thu, 05 Feb 2026 00:00:00 GMT

Photo credit J. Carragher, CC BY 4.0. The Seine River fed Steep Rock Lake. To isolate the lake for mining, the river had to go somewhere else. In March 1943, after years of negotiation involving Steep Rock Iron Mines Limited, Ontario Hydro, and the Ontario-Minnesota Pulp and Paper Company, engineers began the diversi...

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Image: J. Carragher | CC BY 4.0

Steep Rock Lake: Mining the Lake Bottom

Thu, 05 Feb 2026 00:00:00 GMT

Photo credit Steep Rock Iron Mines, CC BY 4.0. By the spring of 1944, pumps were draining the middle arm of Steep Rock Lake. A pumping barge fitted with a suction dredge cleared silt from the lake bed to expose the ore body beneath. In September 1944, enough had been removed to begin mining. The first trainload of iron ore le...

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Image: Steep Rock Iron Mines | CC BY 4.0

Steep Rock Lake: Operation Up and Over

Thu, 05 Feb 2026 00:00:00 GMT

Photo credit J. Carragher, CC BY 4.0. The most improbable chapter came in March 1954. Two massive dredges -- the Steep Rock and the Marmion -- needed to be moved from the completed Hogarth Mine pit to the next ore zone. Rather than disassemble them, engineers fitted the dredges with continuous tracks, attached them t...

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Image: J. Carragher | CC BY 4.0

Steep Rock Lake: Ninety-One Million Tons and a UFO Hoax

Thu, 05 Feb 2026 00:00:00 GMT

Photo credit Steep Rock Iron Mines, CC BY 4.0. Across all its mines -- Errington, Hogarth, Roberts, and the Caland operation -- Steep Rock Lake produced over 91 million tons of iron ore between 1944 and 1980. The Hogarth Mine alone shipped 25.6 million tons. Caland topped them all at 34.6 million. A pelletizing plant built in...

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Image: Steep Rock Iron Mines | CC BY 4.0