Mines produce the ore used by workshops, which makes it a very profitable business... If you can afford the initial investment.
High Quality Picks
High quality pickaxes provide a boost of +0.4 in production speed.
By removing excess stone from the ore your workers can store more goods.
Unlocks another workspace upgrade.
Comfortable Working Conditions
Invest in a nicer working environment for your workers. Adding more workers to a single production will become much more efficient.