Some refactoring. Also, copper.

src/java/mmm/materials/E_MMetalItemType.java

@@ -0,0 +1,14 @@
+package mmm.materials;
+
+public enum E_MMetalItemType {
+	INGOT( "ingot" ) ,
+	NUGGET( "nugget" );
+
+	public final String name;
+
+
+	private E_MMetalItemType( String name )
+	{
+		this.name = name;
+	}
+}

src/java/mmm/materials/MMetal.java

@@ -0,0 +1,58 @@
+package mmm.materials;
+
+
+import mmm.utils.I_URecipeRegistrar;
+import mmm.utils.URegistry;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.fml.common.registry.GameRegistry;
+
+
+
+public class MMetal
+		implements I_URecipeRegistrar
+{
+
+	public final Item INGOT;
+	public final Item NUGGET;
+
+
+	public MMetal( final String name )
+	{
+		this.INGOT = new MMetalItem( E_MMetalItemType.INGOT , name );
+		this.NUGGET = new MMetalItem( E_MMetalItemType.NUGGET , name );
+	}
+
+
+	public MMetal( final Item ingot , final Item nugget )
+	{
+		this.INGOT = ingot;
+		this.NUGGET = nugget;
+	}
+
+
+	public MMetal register( )
+	{
+		if ( this.INGOT instanceof MMetalItem ) {
+			URegistry.addItem( this.INGOT );
+		}
+		if ( this.NUGGET instanceof MMetalItem ) {
+			URegistry.addItem( this.NUGGET );
+		}
+		if ( this.INGOT instanceof MMetalItem || this.NUGGET instanceof MMetalItem ) {
+			this.registerRecipes( );
+		}
+		return this;
+	}
+
+
+	@Override
+	public void registerRecipes( )
+	{
+		GameRegistry.addShapelessRecipe( new ItemStack( this.NUGGET , 9 ) , this.INGOT );
+		GameRegistry.addRecipe( new ItemStack( this.INGOT ) , //
+				"NNN" , "NNN" , "NNN" , //
+				'N' , this.NUGGET );
+	}
+
+}

src/java/mmm/materials/MMetalItem.java

@@ -7,15 +7,14 @@ import net.minecraft.item.Item;
 
 
 
-public class MItem
+public class MMetalItem
 		extends Item
 {
-
-	public MItem( String name )
+	public MMetalItem( final E_MMetalItemType type , final String name )
 	{
 		super( );
 		this.setCreativeTab( CreativeTabs.MATERIALS );
-		URegistry.setIdentifiers( this , "materials" , name );
+		URegistry.setIdentifiers( this , "materials" , type.name , name );
 	}
 
 }

src/java/mmm/materials/MOre.java

@@ -5,6 +5,7 @@ import java.util.Random;
 
 import javax.annotation.Nullable;
 
+import mmm.utils.I_URecipeRegistrar;
 import mmm.utils.URegistry;
 import net.minecraft.block.Block;
 import net.minecraft.block.SoundType;
@@ -18,11 +19,13 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
+import net.minecraftforge.fml.common.registry.GameRegistry;
 
 
 
-public class DOre
+public class MOre
 		extends Block
+		implements I_URecipeRegistrar
 {
 	private int dropMin , dropMax;
 	private Item dropItems;
@@ -30,14 +33,17 @@ public class DOre
 
 	private int expMin , expMax;
 
+	private MMetal metal;
+	private float smeltingXP;
 
-	public DOre( final String name , final int harvestLevel )
+
+	public MOre( final String name , final int harvestLevel )
 	{
 		this( name , harvestLevel , Material.ROCK.getMaterialMapColor( ) );
 	}
 
 
-	public DOre( final String name , final int harvestLevel , final MapColor color )
+	public MOre( final String name , final int harvestLevel , final MapColor color )
 	{
 		super( Material.ROCK , color );
 		this.setCreativeTab( CreativeTabs.BUILDING_BLOCKS );
@@ -45,31 +51,33 @@ public class DOre
 		this.setHardness( 3.0f );
 		this.setResistance( 5.0f );
 		this.setHarvestLevel( "pickaxe" , harvestLevel );
-		URegistry.setIdentifiers( this , "materials" , "ores" , name );
+		URegistry.setIdentifiers( this , "materials" , "ore" , name );
 		this.dropMin = this.dropMax = 1;
 		this.expMin = this.expMax = 0;
+		this.metal = null;
+		this.smeltingXP = 0;
 	}
 
 
-	public DOre setDrops( final Item item )
+	public MOre setDrops( final Item item )
 	{
 		return this.setDrops( item , 0 , 1 , 1 );
 	}
 
 
-	public DOre setDrops( final Item item , final int meta )
+	public MOre setDrops( final Item item , final int meta )
 	{
 		return this.setDrops( item , meta , 1 , 1 );
 	}
 
 
-	public DOre setDrops( final Item item , final int dropMin , final int dropMax )
+	public MOre setDrops( final Item item , final int dropMin , final int dropMax )
 	{
 		return this.setDrops( item , 0 , dropMin , dropMax );
 	}
 
 
-	public DOre setDrops( final Item item , final int meta , final int dropMin , final int dropMax )
+	public MOre setDrops( final Item item , final int meta , final int dropMin , final int dropMax )
 	{
 		assert dropMin <= dropMax;
 		assert dropMin > 0;
@@ -81,13 +89,13 @@ public class DOre
 	}
 
 
-	public DOre setExperience( final int value )
+	public MOre setExperience( final int value )
 	{
 		return this.setExperience( value , value );
 	}
 
 
-	public DOre setExperience( final int min , final int max )
+	public MOre setExperience( final int min , final int max )
 	{
 		assert min <= max;
 		assert min >= 0;
@@ -97,6 +105,14 @@ public class DOre
 	}
 
 
+	public MOre setMetal( final MMetal metal , final float smeltingXP )
+	{
+		this.metal = metal;
+		this.smeltingXP = smeltingXP;
+		return this;
+	}
+
+
 	@Override
 	@Nullable
 	public Item getItemDropped( final IBlockState state , final Random rand , final int fortune )
@@ -152,4 +168,19 @@ public class DOre
 	{
 		return new ItemStack( this );
 	}
+
+
+	@Override
+	public void registerRecipes( )
+	{
+		if ( this.metal != null ) {
+			if ( this.dropItems == null ) {
+				GameRegistry.addSmelting( this , new ItemStack( this.metal.INGOT ) , this.smeltingXP );
+			} else {
+				GameRegistry.addSmelting( this.dropItems , new ItemStack( this.metal.INGOT ) , this.smeltingXP );
+			}
+			this.metal = null;
+		}
+	}
+
 }

src/java/mmm/materials/Materials.java

@@ -1,27 +1,25 @@
 package mmm.materials;
 
 
-import mmm.utils.I_URecipeRegistrar;
 import mmm.utils.URegistry;
 import net.minecraft.init.Items;
-import net.minecraft.item.ItemStack;
-import net.minecraftforge.fml.common.registry.GameRegistry;
 
 
 
 public class Materials
-		implements I_URecipeRegistrar
 {
-	public static final DOre ORE_COPPER;
+	public static final MMetal GOLD;
+	public static final MMetal IRON;
+	public static final MMetal COPPER;
 
-	public static final MItem NUGGET_IRON;
+	public static final MOre ORE_COPPER;
 
 	static {
-		URegistry.addBlock( ORE_COPPER = new DOre( "copper" , 1 ) );
+		GOLD = new MMetal( Items.GOLD_INGOT , Items.GOLD_NUGGET ).register( );
+		IRON = new MMetal( Items.IRON_INGOT , new MMetalItem( E_MMetalItemType.NUGGET , "iron" ) ).register( );
+		COPPER = new MMetal( "copper" ).register( );
 
-		URegistry.addItem( NUGGET_IRON = new MItem( "iron_nugget" ) );
-
-		URegistry.addRecipeRegistrar( new Materials( ) );
+		URegistry.addBlock( ORE_COPPER = new MOre( "copper" , 1 ).setMetal( COPPER , 0.4f ) );
 	}
 
 
@@ -36,13 +34,4 @@ public class Materials
 		// EMPTY
 	}
 
-
-	@Override
-	public void registerRecipes( )
-	{
-		GameRegistry.addShapelessRecipe( new ItemStack( Materials.NUGGET_IRON , 9 ) , Items.IRON_INGOT );
-		GameRegistry.addRecipe( new ItemStack( Items.IRON_INGOT ) , //
-				"NNN" , "NNN" , "NNN" , //
-				'N' , Materials.NUGGET_IRON );
-	}
 }

src/resources/assets/mmm/blockstates/materials/ore/copper.json

@@ -0,0 +1,5 @@
+{
+    "variants": {
+        "normal": { "model": "mmm:materials/ore/copper" }
+    }
+}

src/resources/assets/mmm/blockstates/materials/ores/copper.json

@@ -1,5 +0,0 @@
-{
-    "variants": {
-        "normal": { "model": "mmm:materials/ores/copper" }
-    }
-}

src/resources/assets/mmm/lang/en_US.lang

@@ -21,6 +21,8 @@ tile.mmm.deco.chair.jungle.name=Jungle Wood Chair
 tile.mmm.deco.chair.dark_oak.name=Dark Oak Chair
 
 
-tile.mmm.materials.ores.copper.name=Native Copper
+item.mmm.materials.nugget.iron.name=Iron Nugget
 
-item.mmm.materials.iron_nugget.name=Iron Nugget
+item.mmm.materials.ingot.copper.name=Copper Ingot
+item.mmm.materials.nugget.copper.name=Copper Nugget
+tile.mmm.materials.ore.copper.name=Native Copper

src/resources/assets/mmm/models/block/materials/ore/copper.json

@@ -1,6 +1,6 @@
 {
     "parent": "minecraft:block/cube_all",
     "textures": {
-        "all": "mmm:blocks/materials/ores/copper"
+        "all": "mmm:blocks/materials/ore/copper"
     }
 }

src/resources/assets/mmm/models/item/materials/ingot/copper.json

@@ -0,0 +1,6 @@
+{
+    "parent": "minecraft:item/generated",
+    "textures": {
+        "layer0": "mmm:items/materials/ingots/copper"
+    }
+}

src/resources/assets/mmm/models/item/materials/nugget/copper.json

@@ -0,0 +1,6 @@
+{
+    "parent": "minecraft:item/generated",
+    "textures": {
+        "layer0": "mmm:items/materials/nuggets/copper"
+    }
+}

src/resources/assets/mmm/models/item/materials/nugget/iron.json

@@ -1,6 +1,6 @@
 {
     "parent": "minecraft:item/generated",
     "textures": {
-        "layer0": "mmm:items/materials/iron_nugget"
+        "layer0": "mmm:items/materials/nuggets/iron"
     }
 }

src/resources/assets/mmm/models/item/materials/ore/copper.json

@@ -0,0 +1,3 @@
+{
+    "parent": "mmm:block/materials/ore/copper"
+}

src/resources/assets/mmm/models/item/materials/ores/copper.json

@@ -1,3 +0,0 @@
-{
-    "parent": "mmm:block/materials/ores/copper"
-}