Water Management

The 25 mg/l limit is the equivalent of two teaspoons of silt in an Olympic-size swimming pool

Mine, quarry and pit operations generally have to be at least 30 metres from neighbouring watercourses. Buffer zones, and other mitigation measures such as ditches and berms, help prevent run-off and other impacts on rivers, streams, ponds, lakes and wetlands.

Mines and quarries test water discharges on at least a monthly basis, and treat it to ensure water quality is within acceptable levels. For example, the maximum suspended solids concentration in a grab sample is 50 mg/l, and the maximum monthly average of suspended solids concentration is 25 mg/l, levels which are widely considered safe for the environment and aquatic life. To put that in perspective, the 25 mg/l limit is the equivalent of two teaspoons of silt in an Olympic-size swimming pool.

When a mine or quarry draws water from a nearby river or lake for use in its operations, the water quality is often better after it has been treated and released back into the river or lake than it was before.

Twitter Updates