The two sites were mined extensively from the 1860s to the early 1940s. Back then, environmental regulations were non-existent, or, at best, inadequate. Miners used liquid mercury to extract gold from crushed rock, and the mine tailings were disposed in nearby waterways. Arsenic, which occurs naturally in rock, was also released as part of the mining process.
read more... http://hazmatmag.com/2019/10/nova-scotia-announces-plan-to-remediate-two-abandoned-gold-mines/
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