Another option that's been popular is to get it as deep underground as possible, hard rock mines with empty areas:

https://en.wikipedia.org/wiki/Sudbury_Neutrino_Observatory

https://en.wikipedia.org/wiki/SNO+

https://en.wikipedia.org/wiki/Super-Kamiokande

There's a weird overlap in engineering and physics disciplines between the hard engineering/business practices of the mining industry, and particle physics.

Right, but for those they need to make/move/collect a large amount of transparent material, like heavy water etc for the particles to interact with. But they get that 'for free' with the ice.