diff --git a/src/net/torvald/terrarum/gameworld/GameWorld.kt b/src/net/torvald/terrarum/gameworld/GameWorld.kt
index 42f2fcf1e..bddc223b0 100644
--- a/src/net/torvald/terrarum/gameworld/GameWorld.kt
+++ b/src/net/torvald/terrarum/gameworld/GameWorld.kt
@@ -85,6 +85,12 @@ open class GameWorld(
     //layers
     @Transient lateinit open var layerWall: BlockLayer
     @Transient lateinit open var layerTerrain: BlockLayer
+    val layerOres = HashedOres() // damage to the block follows `terrainDamages`
+    val wallDamages = HashArray<Float>()
+    val terrainDamages = HashArray<Float>()
+    val layerFluids = HashedFluidTypeAndFills();
+
+
 
     //val layerThermal: MapLayerHalfFloat // in Kelvins
     //val layerFluidPressure: MapLayerHalfFloat // (milibar - 1000)
@@ -102,10 +108,7 @@ open class GameWorld(
         }
     var portalPoint: Point2i? = null
 
-    val wallDamages = HashArray<Float>()
-    val terrainDamages = HashArray<Float>()
-    val fluidTypes = HashedFluidType()
-    val fluidFills = HashArray<Float>()
+
 
     /**
      * Single block can have multiple conduits, different types of conduits are stored separately.
@@ -358,8 +361,7 @@ open class GameWorld(
         terrainDamages.remove(blockAddr)
 
         if (BlockCodex[itemID].isSolid) {
-            fluidFills.remove(blockAddr)
-            fluidTypes.remove(blockAddr)
+            layerFluids.remove(blockAddr)
         }
         // fluid tiles-item should be modified so that they will also place fluid onto their respective map
 
@@ -669,13 +671,10 @@ open class GameWorld(
 
         if (fill > WorldSimulator.FLUID_MIN_MASS) {
             //setTileTerrain(x, y, fluidTypeToBlock(fluidType))
-            fluidFills[addr] = fill
-            fluidTypes[addr] = fluidType
+            layerFluids[addr] = Fill(fluidType, fill)
         }
         else {
-            fluidFills.remove(addr)
-            fluidTypes.remove(addr)
-
+            layerFluids.remove(addr)
         }
 
 
@@ -688,8 +687,8 @@ open class GameWorld(
 
     fun getFluid(x: Int, y: Int): FluidInfo {
         val addr = LandUtil.getBlockAddr(this, x, y)
-        val fill = fluidFills[addr]
-        val type = fluidTypes[addr]
+        val type = layerFluids[addr]?.item
+        val fill = layerFluids[addr]?.amount
         return if (type == null) FluidInfo(Fluid.NULL, 0f) else FluidInfo(type, fill!!)
     }
 
diff --git a/src/net/torvald/terrarum/serialise/Common.kt b/src/net/torvald/terrarum/serialise/Common.kt
index b67eb76e5..eff34fc29 100644
--- a/src/net/torvald/terrarum/serialise/Common.kt
+++ b/src/net/torvald/terrarum/serialise/Common.kt
@@ -4,6 +4,7 @@ import com.badlogic.gdx.utils.Json
 import com.badlogic.gdx.utils.JsonValue
 import com.badlogic.gdx.utils.JsonWriter
 import net.torvald.random.HQRNG
+import net.torvald.terrarum.App.printdbg
 import net.torvald.terrarum.TerrarumAppConfiguration
 import net.torvald.terrarum.console.EchoError
 import net.torvald.terrarum.gameworld.BlockLayer
@@ -265,6 +266,28 @@ object Common {
                 return WeatherMixer.weatherDict[jsonData.asString()]!!
             }
         })
+        // Fill
+        jsoner.setSerializer(Fill::class.java, object : Json.Serializer<Fill> {
+            override fun write(json: Json, obj: Fill, knownType: Class<*>?) {
+                json.writeValue("${obj.item};${obj.amount}")
+            }
+
+            override fun read(json: Json, jsonData: JsonValue, type: Class<*>?): Fill {
+                val csv = jsonData.asString().split(',')
+                return Fill(csv[0], csv[1].toFloat())
+            }
+        })
+        // OrePlacement
+        jsoner.setSerializer(OrePlacement::class.java, object : Json.Serializer<OrePlacement> {
+            override fun write(json: Json, obj: OrePlacement, knownType: Class<*>?) {
+                json.writeValue("${obj.item};${obj.tilePlacement}")
+            }
+
+            override fun read(json: Json, jsonData: JsonValue, type: Class<*>?): OrePlacement {
+                val csv = jsonData.asString().split(',')
+                return OrePlacement(csv[0], csv[1].toInt())
+            }
+        })
     }
 
 
diff --git a/src/net/torvald/terrarum/utils/HashArray.kt b/src/net/torvald/terrarum/utils/HashArray.kt
index ea8fc7ace..bd667ac91 100644
--- a/src/net/torvald/terrarum/utils/HashArray.kt
+++ b/src/net/torvald/terrarum/utils/HashArray.kt
@@ -1,6 +1,8 @@
 package net.torvald.terrarum.utils
 
 
+import com.badlogic.gdx.utils.Json
+import com.badlogic.gdx.utils.JsonValue
 import net.torvald.terrarum.gameactors.ActorValue
 import net.torvald.terrarum.gameitems.ItemID
 import net.torvald.terrarum.gameworld.BlockAddress
@@ -17,7 +19,6 @@ class HashArray<R>: HashMap<Long, R>() // primitives are working just fine tho
 
 // Oh for the fucks sake fuck you everyone; json shit won't work with generics
 class WiringGraphMap: HashMap<ItemID, GameWorld.WiringSimCell>()
-class HashedFluidType: HashMap<BlockAddress, ItemID>()
 class HashedWirings: HashMap<BlockAddress, GameWorld.WiringNode>()
 class HashedWiringGraph: HashMap<BlockAddress, WiringGraphMap>()
 class MetaModuleCSVPair: HashMap<String, ZipCodedStr>()
@@ -47,3 +48,15 @@ class PlayerLastStatus() {
 @JvmInline value class ZipCodedStr(val doc: String = "") {
     override fun toString() = doc
 }
+
+@Deprecated(
+    "Unused and only exists for the savegame compatibility",
+    ReplaceWith("HashedFluidTypeAndFills")
+) class HashedFluidType: HashMap<BlockAddress, ItemID>()
+
+
+data class Fill(var item: ItemID, var amount: Float)
+data class OrePlacement(var item: ItemID, var tilePlacement: Int)
+
+class HashedFluidTypeAndFills: HashMap<BlockAddress, Fill>()
+class HashedOres: HashMap<BlockAddress, OrePlacement>()
\ No newline at end of file