Helicopter view of dam cut the day of the breach shows accumulation of tailings that remains

What we know about the mine spill

Water and sediment tests at Mount Polley have offered some comfort to locals, after typical disaster porn of early media reports

Today I’ll attempt to cut through the speculation and fear-mongering that have swirled around the Mount Polley mine dam breach and tell you what’s really known.

As Black Press and our local publication the Williams Lake Tribune reported before and after the incident, the mine reopened in 2005 after a four-year shutdown and was expanding its operation, including the tailings pond. Rising metal prices helped put 380 unionized employees plus management back to work. Most are now working on rebuilding the tailings dam and cleaning up the spill site.

Imperial Metals applied earlier this summer for an increase in water discharge, and was waiting for B.C. government approval at the time of the Aug. 4 dam breach. This was to be the second amendment to a water release permit issued when the mine started up in 1997. It has had a surplus of water due to rain and snow accumulation since it opened (under an NDP government, for those who want to turn everything into a political corruption story).

The reason water release has been allowed is that in the absence of acid-producing rock, metal contamination of water is minimized. Imperial Metals’ routine tests with rainbow trout in undiluted tailings pond water have now been confirmed by environment ministry results, and water and fish from all but the immediate spill area have been cleared for human consumption.

For an example of acid mine drainage, look up the Britannia Mine Museum, now a reclaimed national historic site with a water treatment plant built to function for hundreds of years. Before that, acid-produced toxic metal pollution drained from the abandoned mine into Howe Sound for decades.

Early tests at Mount Polley indicate that this sort of long-term water remediation may not be required. The initial pulse of suspended sediment didn’t last long enough to affect fish in most of Quesnel Lake, much less the Fraser River system. Sediment tests show elevated iron and copper, with “leachability” results to come. Containment and removal will have to be undertaken.

On May 24 of this year, Mount Polley received the first high water warning in its history. This was not a “breach,” contrary to some reports. The latest water permit application and work to raise the dam took place after that.

It’s not difficult to deduce from aerial photos what was happening as mine management found ways to extend operation, including an underground phase. The pond was filling up with pulverized rock, reducing its capacity to hold water. Most of the accumulation is still there for all to see, as is the cross-section of the dam so abruptly exposed in the wee hours of Aug. 4.

It may be months before inspectors and geotechnical engineers can determine the cause of the breach, which occurred with the water level 2.5 metres below the top of the dam, well within permit specifications. Either the design of the earthworks was not adequate, or it was not adequately followed.

TV crews have packed up and left, after sucking out the initial drama and retailing every sensational claim they could find. Tourism operators are pleading with people not to turn their backs on the region after that influx of visitors.

Professional environmentalists are now exploiting Mount Polley as part of their campaign to de-industrialize B.C. A key propaganda tool is a single picture of a salmon with skin removed from part of its dorsal region.

No such fish has been produced, and a single rainbow trout collected the day of the spill is the only confirmed aquatic casualty.

Tom Fletcher is legislature reporter and columnist for Black Press. Twitter: @tomfletcherbc

Just Posted

OPINION: Ten signs that Port Alice has changed

“Right now, our lack of amenities is holding back economic growth in our village”

Striking Western Forest Products workers could lose benefits in September

Union, forest company at odds over Vancouver Island benefit payments as strike enters third month

Port McNeill council discusses ‘bear aware’ and what you can do to stay safe

Port McNeill’s Conservation Officer Brad Adams gave a presentation about being ‘bear aware’.

Port Hardy RCMP release tips to prevent fraud and theft from vehicles

In many of the incidents reported, “the vehicles that were broken into were unlocked.”

Stranded hikers rescued by helicopter on Mt. Schoen

Campbell River Search and Rescue used hoist operation to rescue trio

VIDEO: Ride to Conquer Cancer rolls into Hope

Thousands of cyclist descend on small town for annual cancer fundraiser

VIDEO: Ride to Conquer Cancer rolls into Hope

Thousands of cyclist descend on small town for annual cancer fundraiser

Island murder victim’s mom expresses outrage over mental fitness decision of the accused

Smith vows to keep fighting until justice served for Descoteau

B.C. VIEWS: Pipelines set to roll as federal politicians posture

Projects to drive B.C., Canadian economy in years ahead

B.C. Lions fall to 1-9 after 13-10 loss to Ticats

Lowly Leos have dropped six straight CFL contests

VIDEO: B.C. woman meets biological mother, 38 years later

Mother never gave up hope of finding daughter, despite all the obstacles

B.C. man who died after rescuing swimmer was known for helping others

Shaun Nugent described as a dad, a coach, a hero and ‘stand-up guy’ at celebration of life

B.C. RCMP plane chases fleeing helicopter as part of major cross-border drug bust

The helicopter eventually landed at a rural property near Chilliwack

Vancouver Island man dead after reported hit-and-run incident

Oceanside RCMP seek public’s help gathering information

Most Read