Every building does not need a rebuild mine method.

src/engine/gameManager/BuildingManager.java

@@ -851,4 +851,15 @@ public enum BuildingManager {
         }
 
     }
+
+    public static void rebuildMine(Building mineBuilding) {
+        mineBuilding.setRank(1);
+        mineBuilding.meshUUID = mineBuilding.getBlueprint().getMeshForRank(mineBuilding.rank);
+
+        // New rank mean new max hit points.
+
+        mineBuilding.healthMax = mineBuilding.getBlueprint().getMaxHealth(mineBuilding.rank);
+        mineBuilding.setCurrentHitPoints(mineBuilding.healthMax);
+        mineBuilding.getBounds().setBounds(mineBuilding);
+    }
 }

src/engine/objects/Building.java

@@ -89,7 +89,7 @@ public class Building extends AbstractWorldObject {
     private int maxGold;
     private int effectFlags = 0;
     private String name = "";
-    private int rank;
+    public int rank;
     private boolean ownerIsNPC = true;
     private boolean spireIsActive = false;
     private ConcurrentHashMap<String, JobContainer> timers = null;
@@ -954,17 +954,6 @@ public class Building extends AbstractWorldObject {
 
     }
 
-    public final void rebuildMine() {
-        this.setRank(1);
-        this.meshUUID = this.getBlueprint().getMeshForRank(this.rank);
-
-        // New rank mean new max hit points.
-
-        this.healthMax = this.getBlueprint().getMaxHealth(this.rank);
-        this.setCurrentHitPoints(this.healthMax);
-        this.getBounds().setBounds(this);
-    }
-
     public final void refreshGuild() {
 
         UpdateObjectMsg uom = new UpdateObjectMsg(this, 5);

src/engine/workthreads/HourlyJobThread.java

@@ -163,7 +163,7 @@ public class HourlyJobThread implements Runnable {
         mine.nationName = nation.getName();
         mine.nationTag = nation.getGuildTag();
 
-        mineBuilding.rebuildMine();
+        BuildingManager.rebuildMine(mineBuilding);
         WorldGrid.updateObject(mineBuilding);
 
         ChatSystemMsg chatMsg = new ChatSystemMsg(null, mine.lastClaimer.getName() + " has claimed the mine in " + mine.getParentZone().parent.zoneName + " for " + mine.getOwningGuild().getName() + ". The mine is no longer active.");