Associate
I don't know if that is an old map of minerals, but it's not accurate. Diamonds start at level 1, not 10. Iron, Coal, Gold etc start from level 1 also and there's no layer of lava above bedrock.
Pinched from the Minecraft forums.
Bedrock/Adminium is in depths 0-4 (going up increases "depth")
Diamond is normal up to depth 16 (Redstone too)
Gold is normal up to 32
Iron is normal up to 64
Coal is normal up to 128
Yeah I probably should have mentioned that! It's pretty much correct other than it's everything "up to" rather than certain ranges