== Maintenance ==
Once installed, the silver mine door slowly loses strength. To keep it from decaying, it has to be repaired. To repair the silver mine door, activate a [[silver lump]], right click the mine door and select ''Improve''. The lump does not need to be glowing hot to be used.
The maximum strength you can improve a silver mine door to depends on the silver lump and your blacksmithing skill. The formula is 100 * (Lump QL / 4 + Blacksmithing skill / 2).