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[shlorf]

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On my current fort i found an adamantine tube very fast via a magma pool in the first cavern layer. But it seems to be the only tube on the map (I revealed all of the magma sea and dfprospector shows a number that roughly fits the remaining magma submerged bits).
So i decided to make some obsidian around the tube, so that i can mine anything that's not connected to the center.
I never did this and i thought I'd ask first before i create some neverending cave ins or have new magma leaking into my obsidian mantle.  What I'm planning is to make a tunnel to the lake in cavern layer 3 that can be closed with a floorhatch. Then i channel away the floor for every tile of magma that's orthogonally touching the adamantine. Add the right amount of water and then proceed in this manner until every tile that i want to mine is surrounded by obsidian. Afterwards i mine out the adamantine and do the same on the next z-level (i got about 5 levels until it hits the semi molten rock). Am I missing anything? Anything i need to look out for? Will magma spawn on the tiles that were magma flow before they were turned into obsidian after i mine them out?

[Darvi]

Watch out for clowns

[shlorf]

Oh I will I'm running into the first problem already tho. I did build a nice obsidian casing around most of the ore but some tiles refrain from becoming stone and will instead eat pretty much all water i pour into it. Magma appears to be destroyed in the process and a lot of mist is generated. These are magma flow tiles, are they impossible to destroy?

[Hans Lemurson]

I believe that it is impossible to get rid of "magma flow" tiles, but I've honestly never tried.  Can you construct floors over them?

[shlorf]

Yeah i can construct over them, but it won't help. I'm also pretty sure i found out why i can't get rid of them. I misjudged the amount of z-levels still left until the smr. I only got like 3 levels to work with and the level 2 levels below my current obsidian already has a few tiles of smr (with the magma flow tiles i can't get rid of right above). So i guess I'm out of luck. I could maybe get a few chunks of ore more if i go to the next level but it doesn't seem worth the hassle. At least i know now, that anything that touches smr vertically or horizontally is a dead end.

update:
Damn i got 20 pieces out of it, now I'm tempted to try and get more.

[Hans Lemurson]

Since magma has no natural pressure, and will not flow up a U-bend, I think you should probably be able to expand your obsidian encasement so that you'll have more space to work with.  This seems like an interesting project to try.

[gtmattz]

I have done this through 7 levels of magma sea.  Unfortunately the bottommost layer of magma, with the SMR below it, will never obsidianize, so that layer will not be able to be completely mined out.

[Nathan_]

could the bottom layer be pumped out long enough for construction to be put in place?

[QuantumMenace]

Can you crash a cave-in onto the SMR level? (this will push the magma there upward, so be careful)

[Urist Imiknorris]

Yes, but the SMR will eat it.

[shlorf]

could the bottom layer be pumped out long enough for construction to be put in place?

I doubt it, as magma flow tiles above smr spawn new magma continuously. Even if the spawnrate is low there's still magma in adjacent tiles.