Marmora Mine

There's a breathtaking hidden lake in a deserted mine near Toronto

If you’re in search of a day trip from this summer, you should seriously consider checking out Marmora Mine. Stunning turquoise water, hiking trails, and rich historical value make it a must-visit.

Located only two hours from Toronto along Highway 7  in Hastings County, this historical site was once a fully functioning iron-steel mine but has been slowing filling with water since the plant stopped operations in the 1970s.

While the mine was still running, giant pumps were installed to keep water from accumulating but these were turned off when the plant closed.

Today, the man-made mine that stretches over 75 acres is filled with water as deep as 550 feet. The water originates from an underground spring, which was exposed during mining operations and rainwater that collected over time. 

The water is said to contain a wealth of minerals like iron, garnet, and pyrite. 

You can immerse yourself in all of the rich history and information surrounding the pit with the informative signs placed throughout the location.

The several hundred feet of bright blue water bordered in by gigantic rock walls also create an unbeatable view. The incredible turquoise hue of the water might even help to satisfy your tropical cravings this summer. 

Just keep in mind that swimming or getting too close to the mine isn’t allowed as it's all fenced off. 

If you get tired of taking in the spectacular sight from the viewing point, there’s also plenty of scenic hiking paths and ATV trails in the area.

What's even better is you can visit this vast attraction free-of-charge.

Lead photo by

kawarthanow


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