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Deep beneath vast fields that grow a dozen varieties of potatoes lies a valuable gray rock tinged with light browns and blues. The rock is hard, durable and dense, part of the 400-million-year-old Amabel Formation that once belonged to a warm, shallow sea.
To Toronto’s high-rise condominium developers and road-construction engineers, this high-quality limestone, known as Amabel dolostone, is an invaluable ingredient in the making of superior concrete and asphalt. Builders turn to it when they need to make the sturdiest of structures. The CN Tower, Highway 401 and Pearson International Airport all contain bits of Amabel dolostone.
Yet this precious rock, a building block of the ever-growing Toronto region, is at the heart of a quarry battle of the likes never seen before in Ontario. Quarries are almost always controversial. No one wants to live near an industrial pit with loud blasting, thick dust and a steady stream of big trucks. But the fight over the proposed Melancthon Quarry, about 120 kilometres north of Toronto, is different.