Where is the confusion? the rules clearly state that no fading doors are allowed and no building around the rocks
8.2 You can not use fading doors in the mines or build in the main entrance of the mine.
8.6: You're not allowed to block or build directly around the mining entities and should be at least three body lengths away. (Three people should be able to stand in a line directly in front of one another around the entire entitie. *ROCK, GOLD or RUBY*.