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I think the UK had the none-mountainous version of strip mining - open pit mines. I think there aren't any in operation currently, and I'm unsure if they were for coal or just other commodities.

Even if not, the collieries in Wales, built on top of coal shafts, were quite industrial-looking/landscape-runining. https://museum.wales/articles/1260/Nantgarw-Colliery---once-...

We used the technique until we ran out of mountains, hence current lack of mountains.