First sorry for my English. I hope to be understood right :)
Sometimes someone build а building in the wrong place or must be replaced. If a building is demolished by the player then should return a small part of the base material.
Example: I build a stone wall on wrong place and must demolished it. When I destroy it on the ground should fall some basic materials, in this case, several stones. *This may be only for some buildings - not for all
I suggest some tools like an axе, pickaxe, shovel ... not only reduces extraction time and depending on what they're made (stone, iron, steel) vary the amount of harvested resource. As with bucket and well. Now the difference in the time of extraction of resources between the stone, iron and steel pickaxe is 8-10-13 sec. approx. Which is negligible and all carry iron tools and for 2-3sek. not worth the resource for the production of steel tools.
I suggest an example: 1. Stone pick: extraction time: 13-15sek. / 5-10 ore 2. Iron pickaxe: extraction time: 10-11sek. / 10-15 ore 3. Steel pickaxe: extraction time: 7-8sek. / 15-20 ore
- time and the amount are only examples