Hampus E.
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The mine part is not really visible, but for old machinery and statues of miners. The art exhibition is in parts of the supporting building. There weren't anyone who spoke English there (apart from a few words), but it wasn't really needed. They had a small café open where you could buy snacks and drinks. There was also a restaurant, but it was empty. To get there, I walked from Gohan station (1 hour). There was a bus station close by, but timetable only in Korean. I liked the mix of industrial machines and handicraft and if that is your thing, a visit is worth it. But it ate up a lot of time for me to get there.