diff --git a/TODO.txt b/TODO.txt
index 3aa6569..b016a44 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -31,6 +31,7 @@ food		No		Extra recipes
 						Various mashes
 -------------------------------------------------------------------------------------------------------
 materials		No		Alloys
+							Pig iron
 							Steel
 							Bronze
 							Brass
@@ -39,9 +40,13 @@ materials		No		Metal from slag
 							-> generate iron nuggets in furnace
 							-> random nuggets in alloy furnace
 -------------------------------------------------------------------------------------------------------
+materials.ores	No		Limestone
 materials.ores	No		Rock salt
-materials.ores	No		Tin
-materials.ores	No		Zinc
+materials.ores	No		Tin (cassiterite)
+materials.ores	No		Zinc (sphalerite)
+materials.ores	No		Aluminium (bauxite)
+materials.ores	No		Silver (native, horn silver)
+materials.ores	No		Lead (galena)
 -------------------------------------------------------------------------------------------------------
 tech.base		No		Coke oven
 -------------------------------------------------------------------------------------------------------