Hutchinson, Kansas rock salt and Strataca: Permian halite extending across roughly 37,000 square miles, mining at about 650 feet depth and underground heritage reuse.
Cleveland’s underground rock-salt mine beneath Lake Erie: Silurian Salina Group halite, deep room-and-pillar workings and more than six decades of industrial production.
Hengelo and Haaksbergen in the Netherlands: deep Zechstein and Triassic halite, solution mining from roughly 400 to 1,200 metres, brine production and subsurface cavern management.
Bex salt mine in the Swiss Alps: centuries of underground galleries, historic brine extraction, Alpine evaporite geology and continuing production within Switzerland’s oldest active salt-mining district.
Racalmuto and Petralia mines in Sicily: Messinian halite, thick evaporite sequences, underground extraction and the broader Sicilian salt-mining province.
Realmonte mine in Sicily: Messinian rock salt, thick halite and potash-bearing evaporites, historic reserve estimates around 70 million tonnes and industrial-scale underground production.
Varangéville in Lorraine: France’s last active dry rock-salt mine, Triassic halite around 160 metres deep, room-and-pillar extraction and a historic industrial salt district.
Avan underground rock-salt mine in Yerevan, Armenia: workings around 300 metres deep, documented halite samples near 93% NaCl and continuing industrial production.
Armenia’s geological rock salt around Yerevan and Avan: thick subsurface halite, regional evaporite deposition, underground mining and the tectonic context of the South Caucasus.
Takhar Province rock salt in Afghanistan: Taqcha Khana, Chal I, Chal II and Namakab diapirs, Jurassic halite, salt tectonics and local mining potential.
