220 Meters Deep, an Old Mine Is Today a Turquoise Lake and Could End up Running Like a Large Battery of Clean Energy in Canada

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The gigantic hole left by iron mining outside Marmora (a small town in eastern Ontario) has become as striking as uncomfortable over the years. It is striking, because of the turquoise color of the water accumulated at the bottom of the pit. Uncomfortable, because the place functions as a magnet for curiosity, but also as a risky environment (rock walls, unstable terrain and unusual depth for an artificial lake). Now, that same industrial cavity…