Step 1.Scroll down to where it starts
$itemPrices["CopperOre"] = "0 1 0 0 0 0 0 0 0 0 0 0 0 0 0";
$itemImage["CopperOre"] = nametoid("CopperOreItem");
Next look at this. 0 is the first digit in the "0 1 0 0 0 0 0 0 0 0 0 0 0 0 0" series which in this case is IronOre. So the 1 in the series is Copper Ore because it says [1]CopperOre.
%items[0] = "IronOre";
%items[1] = "CopperOre";
%items[2] = "SilverOre";
%items[3] = "GoldOre";
%items[4] = "Sapphire";
%items[5] = "Emerald";
%items[6] = "Ruby";
%items[7] = "Diamond";
%items[8] = "Turquoise";
%items[9] = "PineWood";
%items[10] = "OakWood";
%items[11] = "MapleWood";
%items[12] = "Blocks";
