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Silver Islet Mine Shafts were established in 1868, plunging up to 365 metres below Lake Superior and producing more than $3 million in silver before shutting down just 16 years later. According to ...

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Today, it serves as a troubling reminder of the legacy left behind by the abandoned gold and silver mines ... the abandoned mines," Williams said. "A cave-in acts as a dam and a lake forms behind ...