KERKRADE, NETHERLANDS - OCTOBER 8: King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands meet with retired miners near the Miner's Monument d'r Joep during a visit to the former mining region on October 8, 2015 in Kerkrade,  Netherlands. The former mining region this year celebrates the 'Year of the Mines', 50 years after the announcement of the closing of the mines. (Photo by Michel Porro/WireImage)