Mine ore has two parts the actual ore like MineOreGold04 and the furniture piece (PickaxeMiningFloorMarker, PickaxeMiningTableMarker & PickaxeMiningWallMarker
) that tell how to animate the act of mining. You need to link the Ore ref to the PickaxeMining Ref for that vain (no keyword) or it will show up as depleted. I think one ore doesn't work, a gold ore that is flat (forgot the number), that one wouldn't work for me.
Visit http://www.creationkit.com/Additional_Prefabs to learn more.