On Sunday, Grand Duke Henri was in Kayl to attend an official ceremony for the 30th international day of miners. The site of the ceremony, known as Léiffrächen, is a monument to the miners who died there: a group of slates lists out the names of each worker, and a cave with a statue of the Virgin Mary is nearby.
Also in attendance were miners from the Bois du Cazier in Belgium.
No photos of the event at present, but they'll be added if and when they become available.
Thanks to the reader who found them! More from RTL. Also, a lovely photo from Revue (scroll down).