Okay, lemme explain it in steps.
> Play Minecraft
> Notice that unlike Coal, Diamond Ore, Redstone Ore, Lapis Lazuli, and Emerald Ore (the last two I haven't actually found in 1.3 yet), Iron Ore and Gold Ore don't drop experience point orbs
> Realize that this is because that the rest all drop items, while Iron and Gold drop the ore blocks, meaning you could get infinite XP by mining and placing them over and over
> Attempt to make mod so that the blocks that Iron and Gold Ore drop are slightly different than the ones that generate in the world
> Fail
> Wait for the Minecraft Forge API to update so I can do this properly
> Play Minecraft
> Notice that unlike Coal, Diamond Ore, Redstone Ore, Lapis Lazuli, and Emerald Ore (the last two I haven't actually found in 1.3 yet), Iron Ore and Gold Ore don't drop experience point orbs
> Realize that this is because that the rest all drop items, while Iron and Gold drop the ore blocks, meaning you could get infinite XP by mining and placing them over and over
> Attempt to make mod so that the blocks that Iron and Gold Ore drop are slightly different than the ones that generate in the world
> Fail
> Wait for the Minecraft Forge API to update so I can do this properly