Mount Polley breach: What Thursday’s tailings test won’t tell you

Written by admin on 21/07/2019 Categories: 苏州美甲美睫培训

B.C.’s environment ministry is providing the results of initial water quality tests in the wake of a massive tailings pond breach that sent five million cubic metres of mine waste roaring through the Cariboo Region.

The hope is to provide a modicum of certainty for residents whose lives have been overturned by a state of emergency and the ecologists fearful of its impact on spawning salmon: Just how toxic is this water?


READ MORE: Former Mount Polley mine employee speaks out

Imperial Metals President Brian Kynoch courted scorn earlier this week when he called the water “very close” to drinkable, and safe for fish.

Whether or not that’s the case, Thursday’s tests of water from Quesnel Lake won’t touch the mess of sludge that poured out of that pond Monday morning. It’s still too dangerous to test Hazeltine Creek, for fear of more tailings waste breaching the impoundment area.

And while what’s in the water will have the most effect in the short term, and a high pH level will slow most metals’ leaching into it, in the long term those suspended solids will have the biggest impact. If they aren’t cleaned up – tough to do given that officials still don’t know how far the sludge travelled or where it went – they’ll weather and wear into the environment. And that could pose problems.

READ MORE: What’s in Imperial Metals’ Mount Polley tailings, and should you be worried?

According to Imperial Metals’ filings with Environment Canada last year, substances it disposed on-site in the tailings pond included phosphorous, manganese, lead and mercury.

The company has until Aug. 15 to provide a more complete assessment of the spill’s impact.

PHOTOS: Before and after the Mount Polley breach

Substances listed as disposed “on-site” in Imperial Metals’ 2013 Mount Polley Mine report (Note: We still don’t know how mobile these solids were, how much was in water, and how much spilled as solids in Monday’s massive breach)

Phosphorus – 41,640 tonnesManganese – 20,988 tonnesCopper – 18,413 tonnesVanadium – 5,047 tonnesZinc – 2,169 tonnesCobalt – 475 tonnesNickel – 326 tonnesAntimony – 14 tonnesArsenic – 406,122 kgLead – 177,041 kgSelenium – 46,136 kgCadmium – 6,487 kgMercury – 3,114 kg

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