diff --git a/OpenRA.Game/OpenRA.Game.csproj b/OpenRA.Game/OpenRA.Game.csproj
index f41e09dee1..7965e8cdbe 100644
--- a/OpenRA.Game/OpenRA.Game.csproj
+++ b/OpenRA.Game/OpenRA.Game.csproj
@@ -114,7 +114,6 @@
     <Compile Include="Traits\World\ChoosePaletteOnSelect.cs" />
     <Compile Include="Traits\World\Country.cs" />
     <Compile Include="Traits\World\CrateSpawner.cs" />
-    <Compile Include="Traits\World\OreGrowth.cs" />
     <Compile Include="Traits\OreRefinery.cs" />
     <Compile Include="Traits\Activities\Attack.cs" />
     <Compile Include="Traits\Activities\CallFunc.cs" />
diff --git a/OpenRA.Game/Traits/World/ResourceLayer.cs b/OpenRA.Game/Traits/World/ResourceLayer.cs
index 6f389afcd3..784fc1f385 100644
--- a/OpenRA.Game/Traits/World/ResourceLayer.cs
+++ b/OpenRA.Game/Traits/World/ResourceLayer.cs
@@ -159,7 +159,7 @@ namespace OpenRA.Traits
 						++content[i, j].density;
 		}
 
-		public void Spread(ResourceTypeInfo info, Random r, float chance)
+		public void Spread(ResourceTypeInfo info)
 		{
 			var map = w.Map;
 
@@ -170,7 +170,6 @@ namespace OpenRA.Traits
 			for (int j = minj; j < maxj; j++)
 				for (int i = mini; i < maxi; i++)
 					if (content[i,j].type == null
-						&& r.NextDouble() < chance
 						&& GetAdjacentCellsWith(info, i,j ) > 0
 						&& w.IsCellBuildable(new int2(i, j), UnitMovementType.Wheel))
 						growMask[i, j] = true;
diff --git a/OpenRA.Game/Traits/World/ResourceType.cs b/OpenRA.Game/Traits/World/ResourceType.cs
index 6c98f0a8ea..79a1e25e92 100644
--- a/OpenRA.Game/Traits/World/ResourceType.cs
+++ b/OpenRA.Game/Traits/World/ResourceType.cs
@@ -19,7 +19,7 @@
 #endregion
 
 using OpenRA.Graphics;
-using System.Collections.Generic;
+
 namespace OpenRA.Traits
 {
 	public class ResourceTypeInfo : ITraitInfo
@@ -27,13 +27,41 @@ namespace OpenRA.Traits
 		public readonly int[] Overlays = { };
 		public readonly string[] SpriteNames = { };
 		public readonly string Palette = "terrain";
+
 		public readonly int ValuePerUnit = 0;
 		public readonly string Name = null;
 
+		public readonly float GrowthInterval = 0;
+		public readonly float SpreadInterval = 0;
+
 		public Sprite[][] Sprites;
 		
-		public object Create(Actor self) { return new ResourceType(); }
+		public object Create(Actor self) { return new ResourceType(this); }
 	}
 
-	class ResourceType { }
+	class ResourceType : ITick
+	{
+		int growthTicks;
+		int spreadTicks;
+		ResourceTypeInfo info;
+
+		public ResourceType(ResourceTypeInfo info) { this.info = info; }
+
+		public void Tick(Actor self)
+		{
+			if (info.GrowthInterval != 0 && --growthTicks <= 0)
+			{
+				growthTicks = (int)(info.GrowthInterval * 25 * 60);
+				self.World.WorldActor.traits.Get<ResourceLayer>().Grow(info);
+				self.World.Minimap.InvalidateOre();
+			}
+
+			if (info.SpreadInterval != 0 && --spreadTicks <= 0)
+			{
+				spreadTicks = (int)(info.SpreadInterval * 25 * 60);
+				self.World.WorldActor.traits.Get<ResourceLayer>().Spread(info);
+				self.World.Minimap.InvalidateOre();
+			}
+		}
+	}
 }
diff --git a/mods/cnc/compat.yaml b/mods/cnc/compat.yaml
index 010c119e6d..44b1266e79 100644
--- a/mods/cnc/compat.yaml
+++ b/mods/cnc/compat.yaml
@@ -38,4 +38,5 @@ MINE:
 	RenderBuilding:
 		Palette: terrain
 	SeedsOre:
+		ResourceType: Tiberium
 	-Selectable:
diff --git a/mods/cnc/system.yaml b/mods/cnc/system.yaml
index 0dd0e95844..9f3af4c520 100644
--- a/mods/cnc/system.yaml
+++ b/mods/cnc/system.yaml
@@ -153,11 +153,6 @@ World:
 		B: 0
 		A: 180
 	ShroudPalette:
-	OreGrowth:
-		Interval: .3
-		Chance: .02
-		Spreads: yes
-		Grows: yes
 	Country@gdi:
 		Name: GDI
 		Race: gdi
@@ -173,3 +168,5 @@ World:
 		SpriteNames: ti1,ti2,ti3,ti4,ti5,ti6,ti7,ti8,ti9,ti10,ti11,ti12
 		ValuePerUnit: 30
 		Name: Tiberium
+		GrowthInterval: .1
+		SpreadInterval: .1
diff --git a/mods/ra/rules.yaml b/mods/ra/rules.yaml
index a1c1bdee32..90d0da1f4b 100644
--- a/mods/ra/rules.yaml
+++ b/mods/ra/rules.yaml
@@ -184,11 +184,6 @@ World:
 		B: 0
 		A: 180
 	ShroudPalette:
-	OreGrowth:
-		Interval: .3
-		Chance: .02
-		Spreads: yes
-		Grows: yes
 	Country@0:
 		Name: England
 		Race: allies
@@ -241,6 +236,8 @@ World:
 		SpriteNames: gold01,gold02,gold03,gold04
 		ValuePerUnit: 30
 		Name: Ore
+		GrowthInterval: .3
+		SpreadInterval: .7
 	ResourceType@gem:
 		Overlays: 9,10,11,12
 		Palette: terrain