diff --git a/core/src/mindustry/ai/BlockIndexer.java b/core/src/mindustry/ai/BlockIndexer.java
index b5a0ef202c..535462e200 100644
--- a/core/src/mindustry/ai/BlockIndexer.java
+++ b/core/src/mindustry/ai/BlockIndexer.java
@@ -33,7 +33,7 @@ public class BlockIndexer{
     /** Stores all damaged tile entities by team. */
     private Seq<Building>[] damagedTiles = new Seq[Team.all.length];
     /** All ores available on this map. */
-    private ObjectSet<Item> allOres = new ObjectSet<>();
+    private ObjectIntMap<Item> allOres = new ObjectIntMap<>();
     /** Stores teams that are present here as tiles. */
     private Seq<Team> activeTeams = new Seq<>(Team.class);
     /** Maps teams to a map of flagged tiles by flag. */
@@ -78,8 +78,6 @@ public class BlockIndexer{
                 var drop = tile.drop();
 
                 if(drop != null){
-                    allOres.add(drop);
-
                     int qx = (tile.x / quadrantSize);
                     int qy = (tile.y / quadrantSize);
 
@@ -92,6 +90,7 @@ public class BlockIndexer{
                             ores[drop.id][qx][qy] = new IntSeq(false, 16);
                         }
                         ores[drop.id][qx][qy].add(tile.pos());
+                        allOres.increment(drop);
                     }
                 }
             }
@@ -150,9 +149,11 @@ public class BlockIndexer{
             //when the drop can be mined, record the ore position
             if(tile.block() == Blocks.air && !seq.contains(pos)){
                 seq.add(pos);
+                allOres.increment(drop);
             }else{
                 //otherwise, it likely became blocked, remove it (even if it wasn't there)
                 seq.removeValue(pos);
+                allOres.increment(drop, -1);
             }
         }
 
@@ -177,7 +178,7 @@ public class BlockIndexer{
 
     /** @return whether this item is present on this map. */
     public boolean hasOre(Item item){
-        return allOres.contains(item);
+        return allOres.get(item) > 0;
     }
 
     /** Returns all damaged tiles by team. */