Question on Mannequins

Hello,
what happens when up ut mannequins into a mine? do they decay? would be nice if we could put mining and alloying set into the mine
edit: also is this still true?
MINING:
Lowers the phlegm when mining a mine tile, increases the Purity of boulders that are pulled from the wall and lowers the hardness of rubble.
what happens when up ut mannequins into a mine? do they decay? would be nice if we could put mining and alloying set into the mine
edit: also is this still true?
MINING:
Lowers the phlegm when mining a mine tile, increases the Purity of boulders that are pulled from the wall and lowers the hardness of rubble.