The first level of gathering Copper requires the player to obtain 125 copper ore pieces.
Each piece of copper ore will take 3 minutes to mine (at a Lvl 1 Mine). It requires a (copper) ore 'tile' (close to the Mine is advised).
Besides the ore 'tile', the Mine does also require 1 lumber. Lumber can be obtained by a Lvl 1 Lumberjack which can cut a tree 'tile'. The Lumber takes 2 minutes to be "produced".
An ore 'tile' is created by placing a stone 'tile' and adding fire to this tile. That will result in smoke and ore. (stone + fire => ore + smoke).