Figured I would share this, I thought it was a great map. Found it while playing around with the random number gods. Couldn't find a seed thread to share it, or maybe I'm just being blind.
It has massive amounts of early-game coal (mainly at an open-ground stone/coal quarry I spawned on), a bunch of caves nearby (at least one leading to an enormous cave system that probably goes several routes to bedrock, I've been at it for over a day and still haven't been able to explore it all), and almost 2 stacks of clay right by where I spawned (not shown in pics). Map reverted to original state, minus my inventory and random torches I had placed earlier. No clue why.
Spawn: 0, 64, 0
Spawned at quarry. Having game issues atm so I can't take any more screenshots of the area; not shown - smallish mountain and clay deposits directly past quarry, plus lots of trees. Desert biome to left. An excellent spot to throw a roof over it and have a quick base.
Hole in ground. Hills/mountains in background. Ignore the boar.
Running into nonstop coal and iron on the way down. Thought there was a zombie dungeon from the number I was running into, but it was just coincidence.
A route almost directly down, buttloads of resources on the way. So far that vein in the background is the only lapis I've seen though.
Thought I had explored it all, went down to get the iron and coal and saw obsidian out of the corner of my eye.
And found water, leading to a waterfall, leading to an entire other bloody cave system.
Starting to ignore coal.
And at this screenshot my game fizzed out and stopped saving them (ignore system time, laptop battery is screwed up).
Not shown: two massive caverns that branch off into even more caves, and another waterfall that leads directly down even further to more caves.