Look at the photo. This museum was opened in 2001. It looks like something from the 1950s. Over detailed information on how to use a chisel and hammer to make a blast hole then cases and cases of unlabelled exhibits.
Definitely up there as one of the most tedious museums I have ever visited. Mind you we picked up a leaflet about the new "mine route" and that looks like it should be good so we're not done with La Unión yet.