Keramos Antimony Mines
Greece
The mines of Keramos are 19th and 20th century mines which were located in the northern part of Chios island, Greece and nowadays is out of use. The mines are best known for extracting stibnite ore for antimony production. A number of remnants of these mines (shafts, galleries, surface workshops) are still present in the region. The location of Keramos was mined in some scale in the mid 19th century but is not clear if it was for metal ore or just a rock mine. Either way, the mines were systematically used in the 1890s when a French metallurgist engineer A. Pelloux assayed the metal ore identity and quality during his vacations. French and Greek companies utilise them for few years each, until 1954.
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).