Comment 3 for bug 1162936

buildingdata: building 2957: productionsite (Marble Mine): site has request for master-miner, for which there is no working position.

Before I saved this I had evicted a master miner from a (normal) marble mine. I had no other master miners. This miner was sent to a deep coal mine which then began operation. The marble mine would have been left with no available workers.