My Lands: Black Gem Hunting

I studied land managment and i put a cottage on stone deposit , but nothing , no production. I miss something or ... what i have to do now for activate production of stone.

When i select , i can't move workers in ?

After doing that science you can build something else on a stone deposit or you can build a stone quarry like before.
You can't have both, if it is something else you don't get the stones, how could a cottage mine stones?