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|passive=[[door lock]]
|group=Mine doors and support beams
|materials=* 1x 12x [[silver sheet]]s
* 1x [[door lock]]
* 50 [[rivets]]
== Maintenance ==
Once installed, the silver mine door slowly loses strengthif off deed. 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).
Each improvement uses 0.1 kg of the silver lump and raises the strength of the mine door by a fifth of the difference between current strength and maximum strength.
The following graph shows the decay of a silver mine door on deed over the course of over a year. The Mine door has been repaired a few times since.
The decay has been about 28 strength per day on average over the whole period of 400 days.
== See also ==
* [[Mine door (gold)]]
* [[Mine door (rockstone)]]
* [[Mine door (steel)]]
* [[Mine door (wood)]]
