The mines of Gladhammar near VÃ¤stervik in SE Sweden were worked at least from the 16th century to the 19th century, producing iron, copper and cobalt. Now they pose a big environmental problem because of heavy metals leaching out of the spoil heaps into a nearby lake. A project is afoot to do something about the site, removing all the spoil (!) to a safer location, and so my colleagues from the Kalmar County Museum have been called in to do some early industrial archaeology prior to the cleanup. Here’s a fascinating short film they’ve shot from a basket lowered with a crane into one of the mines. And here’s a speleological report (a 7 MB pdf file) on what the mines look like, crammed full of excellent photographs by Sven Gunnvall and BjÃ¶rn Gunnvall.