Allow management of guild mines that are still active

src/engine/objects/Mine.java

@@ -220,8 +220,7 @@ public class Mine extends AbstractGameObject {
         // Only inactive mines are returned.
 
         for (Mine mine : Mine.mineMap.keySet()) {
-            if (mine.owningGuild.getObjectUUID() == guildID &&
-                    mine.isActive == false)
+            if (mine.owningGuild.getObjectUUID() == guildID)
                 mineList.add(mine);
         }
         return mineList;