Yea, remember lava can only go on the really dark black land.
It wipes out a tokamak, that's all, don't mine up there at all unless you are desperate, because there's not a lot of time before the lava hits.
You have to get the rare ore as fast as you can go... start making a tube from the bottom of your base at the start, and get the miner ready (take the rare ore on the bottom of those little platforms at the bottom right.)
Get a lot of trucks on the rare ore route, cuz you have to make that spaceport, sulv, and satellite. As you're going start loading the trucks with the metals. If you do it all at the end, you may be in for a little "purple surprise" because it takes too long.
The blight comes in from the lower left, so keep stuff out of that area. It will take the mines at the bottom first, so you have to mine it as fast as you can.
I won the mission with seconds to spare once - the blight was getting the bottom part of my base (move prepared vehicles, etc to the north to avoid the blight)