Can anyone tell us where rock salt(for gritting icy roads) is extracted from in the US and Canada?

Rock salt is generally from salt mines. I don't know how much of the salt used in the US is domestically produced, but it is the world's leading salt producer. Major deposits can be found in the Great Lakes and Gulf of Mexico regions, as well Kansas and as other parts of the country.

On a personal note, a rock salt mine collapsed not too far from where I grew up (in upstate NY) when I was in high school. I'm not sure whether it was ever determined if the coinciding earthquake caused the collapse or the collapse caused the earthquake, but I think the latter was more widely supported.

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Originally posted by methos:
Rock salt is generally from salt mines. I don't know how much of the salt used in the US is domestically produced, but it is the world's leading salt producer. Major deposits can be found in the Great Lakes and Gulf of Mexico regions, as well Kansas and as other parts of the country.

On a personal note, a rock salt mine collapsed not too far from where I grew up (in upstate NY) when I was in high school. I'm not sure whether it was ever determined if the coinciding earthquake caused the collapse or the collapse caused the earthquake, but I think the latter was more widely supported.

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The salt used in the midwest and northeast mostly comes from mines, as you say. West of the Rockies, it's all evaporated from sea water by Cargill from salt evaporation pans on both sides of the San Francisco Bay roughly from Redwood City south on the West side, and Fremont and Milpitas on the East side.

But we don't salt the roads out here.

Alan Moore