Why is my Mining Quarry decaying?

Why does it happen?
A Mining Quarry follows the same decay rules as the rest of your base. If it's placed outside a Tool Cupboard's range - or the TC runs out of upkeep resources - the Quarry gradually loses health and is eventually destroyed.

How to prevent it:
Place the Mining Quarry within your Tool Cupboard's range - on or next to a building that has a TC. Keep the TC stocked with the upkeep resources it needs.

Common mistakes:
Placing the Quarry far from base, outside any TC range - it decays. Letting the Tool Cupboard run empty. Forgetting to top up the TC after a long offline session.