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Hard Hat North Underground Mining Guide
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The deepest underground mines in Canada

Kidd Mine in Timmins, Ontario is Canada’s deepest, bottoming out around 3,014 metres below surface — the world’s deepest copper-zinc mine. Depth isn’t a bragging number: it changes ventilation, rock temperature, and how blasting and ground support are done.

Canada’s deepest mines

Kidd Mine, Timmins, Ontario. Kidd’s No. 4 shaft bottoms out at roughly 3,014 metres (about 9,890 feet) below surface, and around 2,735 metres below sea level. That combination makes it the world’s deepest mine measured below sea level and the deepest copper-zinc mine on the planet — genuinely one of the deepest points on Earth that people work at regularly (Wikipedia - Kidd Mine, accessed 2026-09-07).

Creighton Mine, Sudbury, Ontario. Operated by Vale, Creighton has been pushing deeper for over a century — its No. 9 shaft reached roughly 2,175 metres (7,138 feet) back in 1969, and later expansion work has targeted depths of around 2,444 metres (about 8,020 feet). It’s currently the deepest nickel mine in Canada, and it’s deep enough that a physics research facility, SNOLAB, operates from one of its lower levels specifically because the rock overhead blocks cosmic radiation that interferes with sensitive experiments (Wikipedia - Creighton Mine, accessed 2026-09-07).

LaRonde Mine, near Val-d’Or, Quebec. Agnico Eagle’s LaRonde complex runs the Penna shaft, believed to be the deepest single-lift mine shaft in the Western Hemisphere at more than three kilometres (about 9,800 feet) below surface — a serious piece of engineering just to move people and rock that far vertically in a single continuous hoist run.

Diamond mines near Yellowknife, Northwest Territories. Sites like Diavik started as open-pit operations and transitioned to underground mining as the near-surface ore was exhausted — Diavik’s underground phase began in 2010 and fully replaced open-pit production there by 2012. These aren’t in the same depth league as Kidd or Creighton, but they represent some of the most remote underground mining in the country, reachable only by aircraft or winter ice roads for parts of the year.

Saskatchewan potash mines. Potash operations near Saskatoon and in the province’s east run underground at depths that are shallower than the deep hard-rock mines above — commonly cited in the range of roughly 1,000 metres, though this varies by specific mine and shouldn’t be treated as a precise figure without confirming the specific site. Potash mining also runs in a soft, evaporite rock rather than hard rock, which changes how the working environment behaves even at comparable depths.

Why depth changes the job

The deeper a mine goes, the more three things become part of daily work rather than background facts:

  • Heat. Rock temperature rises with depth (geothermal gradient), so deep mines need active cooling and ventilation systems just to keep working conditions survivable, not just comfortable.
  • Travel time. Getting from surface to a working face several kilometres down, even by cage and underground vehicle, eats real time out of every shift — deep mines plan around this in ways shallower operations don’t need to.
  • Ground control and seismicity. Rock under enormous pressure at depth behaves differently than near-surface rock, including a real risk of seismic events (rockbursts) that shapes how ground support, blasting timing, and evacuation procedures are designed.

Why this matters for pay and roles

Deeper, harder-condition mines generally sit at the upper end of underground pay for comparable roles, for the same reasons underground work in general pays more than open-pit — see our underground vs. open-pit pay post for that comparison. Ventilation technician, mine rescue, and ground-control-related roles also tend to carry more weight at deep operations specifically, since managing heat, air, and rock stability becomes a bigger part of keeping the mine running safely. See our jobs hub and tickets hub for what those specialized roles require.

FAQ

What is the deepest mine in Canada? Kidd Mine near Timmins, Ontario reaches roughly 3,014 metres below surface at its No. 4 shaft, making it the world’s deepest mine measured below sea level and the deepest copper-zinc mine globally.

Do deep mines pay more than shallower ones? Generally, yes for comparable roles, since deeper mines involve harder working conditions (heat, travel time, ground control complexity) that tend to command a pay premium — though the specific role and ticket you hold still matters more than depth alone. See our salaries hub for role-by-role context.

Why is it so hot that far underground? Rock temperature rises naturally with depth (the geothermal gradient), so mines several kilometres down need active mechanical cooling and strong ventilation systems to keep working conditions livable, on top of the ventilation every underground mine needs for air quality and diesel exhaust regardless of depth.