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At missile silo Quebec-12 in 1989 it found levels of up to 50% amosite asbestos, a brown asbestos found in cement and insulation.

But hundreds contain amosite and more than 70 contain all three types.

They are crocidolite - often referred to as blue asbestos; amosite - often called brown asbestos; and chrysotile - white asbestos.

That’s one of six minerals – along with chrysotile, actinolite, amosite, anthophyllite and crocidolite – that occur in nature as crystalline fibers known as asbestos, a recognized carcinogen.