Sudbury researcher has closer look at makeup of McIntyre Powder, once used in mining


Before each shift between the 1940s and 1970s, underground miners in northern Ontario breathed in a substance they thought was protecting their lungs, but none of them knew what exactly was in McIntyre Powder. Until now.

Many of these mine workers developed respiratory or neurological illnesses, later in life.

It was a connection Laurentian University researcher Andrew Zarnke wanted to pursue.

The occupational health coordinator has recently published a paper on the physical and chemical makeup of McIntyre Powder.

He expected to find aluminum and aluminum hydroxide.

But he also discovered the powder was made up of microscopic, ultra-fine particles, known as nanoparticles.

Previous research has connected nanoparticles — of any substance — to harmful health issues, particularly when they’re inhaled. This includes studies on diesel exhaust particulates, which is also a current health concern in mining.

“With nano-technologies these days, you know it brings McIntyre Powder into the arena with a lot of these more recent studies that are looking at health effects from nano-materials,” Zarnke said.

‘No longer a dirty little secret somewhere’

For the past five years, Janice Martell has been collecting health data from miners across northern Ontario who were exposed to the powder. Her father was forced to inhale the substance and later was diagnosed with Parkinson’s Disease. She now feel her work to uncover the truth has been validated.

“It bears witness to what they went through and it also gives us some information to answer the next steps,” she said.

McIntyre Powder, seen in these various canisters was used between 1943 and 1979 in mines, including in northern Ontario. (Supplied/Janice Martell)

Martell is especially pleased for what this means for the men who were exposed to the aluminum dust, and their loved ones.

“Being able to go back to miners, mine workers and their families and say ‘Hey this is no longer a dirty little secret somewhere that they were sweeping under the rug,'” Martell said.

“And to be able to provide them with some answers as to what their loved one or themselves were exposed to.”

More research needed

Zarnke says the next phase of the research involves biological studies to see how human cells react to McIntyre Powder.

“Next steps which involve some biological studies looking at possible geno-toxic effects from the combined stressors of McIntyre Powder or nano-materials and radiation.”

“So we’re now using the information from this new publication to generate hypotheses with regards to possible biological mechanisms and health affects,” he said.

“Being able to provide something like this [research] and say here’s one more piece of the puzzle is validating,” Martell said.

The research is available online at the Journal of Occupational and Environmental Hygiene. It will be published in the November issue of the journal.

Zarnke and Martell will be in Elliot Lake Sept. 23 to hold a public information session. While in the community they also plan to meet with local physicians to discuss mining exposures and health.

Between the 1940s and the late 70s, some miners were told breath in McIntyre Powder before each shift. It was supposed to protect their lungs, but years later these workers developed health issues. New research shows just what was in McIntyre Powder. The CBC`s Angela Gemmill spoke about the findings with researcher Andrew Zarnke and Janice Martell, the founder of the McIntyre Powder Project. 7:54

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