mining ability

im trying to make a ability where the building mines the lumber/gold. ok i got it to work on lumber by giving it lots of range, but the lumber wont return. second the ability wont mine gold or anything. help anyone?:bgrun:

a WHOLE lot more detail would be appreciated, <strikeout>but did you set the unit type of the building to 'worker'?</strikeout>

EDIT:

I know html tags dont work, but you get the idea. i didnt realize its abilities, i dont have TFT (5 more days!!!) so i dont know how to edit them.

sorry.