Vein Miner is a small but very important mod.  Check your Options: Controls to see which
key is setup for vein mining.  Or check Mod Options: Vein Miner: Config to set it to vein mine
while your are sneaking.

However you set it up, when you have the vein miner key pressed, you can harvest an entire tree or an
entire vein of ore, or a whole patch of clay ... in a single whack.  Not every mod block is included,
but its totally configurable.

Very handy for us hoarders!
