diff --git a/src/main/java/gregtech/loaders/misc/GT_Achievements.java b/src/main/java/gregtech/loaders/misc/GT_Achievements.java
index 1d0afd72..b11e98fc 100644
--- a/src/main/java/gregtech/loaders/misc/GT_Achievements.java
+++ b/src/main/java/gregtech/loaders/misc/GT_Achievements.java
@@ -212,7 +212,8 @@ public class GT_Achievements {
 
     public static void registerOre(Materials aMaterial, int min, int max, int chance, boolean overworld, boolean nether, boolean end) {
         if (aMaterial != Materials._NULL) {
-            oreList.add(aMaterial);
+            //oreList.add(aMaterial);
+            if(!oreList.add(aMaterial)) GT_Log.err.println("GT Achievement - Ore with that (" + aMaterial.name() + ") material already exists.");
         }
         oreStats.add(new Integer[]{min, max, chance, overworld ? 1 : 0, nether ? 1 : 0, end ? 1 : 0});
     }