This worked, the problem I see with this is id conflicts between different mods using the id, so maybe I should make a config file that allows for the item ID's to be corrected to the appropriate item id if such conflicts occur.
//IC2 copper item id 249
FurnaceRecipes.smelting().addSmelting(249, new ItemStack(Block.blockLapis), 0.7F);
//Buildcraft copper item id 1398:1
FurnaceRecipes.smelting().addSmelting(1398, 1, new ItemStack(Block.blockLapis), 0.7F);