The seed "
Geothermal" spawns you right next to some really useful things:
Lava, near the surface. The iron ore block is connected to at least six others.
Directly next to the lava (it's to my right on the screenshot), everything else you need including coal. If you level this part off with sand and dig into the mountainside you can get a good space.
Somewhere near bedrock level, digging almost directly down from the above, I found a little open space with more lava, natural obsidian and close by redstone. (dirt by me for safety)
It's not much compared to some of the others but the abundance of lava looks good for some kind of big project...