There are HUGE salt mines near Cayuga Lake in Lansing near Ithaca.
Interesting tidbit. You can store energy with compressed air. Salt caverns are ideal for storing compressed air because the salt is impermeable and you don’t get much air leakage into the salt. “Compressed Air Energy Storage” (CAES) was originally proposed as a way to balance electrical power day to night. You pump up the compressed air at night when excess capacity is available and let the compressed air out in the daytime when you need more power.
There are salt deposits all along the south side of Lake Erie, Lake Ontario and even directly under the city of Detroit.
My company buys about 600 trucks a year of bagged rock salt from American Rock Salt in Mt Morris, NY (south of Rochester).
Syracuse was named for the “saltine warrior”. There are large deposits just on the south side of Syracuse, NY too.