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[Ganthan]

Wouldn't channeling work better instead of mining or carving fortifications?

Side view:

W= wall, M= magma, .= floor,

WWWWWWWWWM
.....................WM
.....................WM
WWWWWWWWWM

Simply dig out the magma trench up to the volcano first, then dig an access path right above it and channel out the volcano wall.  This essentially mines out the wall next to you AND the wall below it at the same time, allowing the magma to fall into the trench instead of spreading out to where the miner is standing.

I tried simulating something like this in arena mode and a tiny bit of magma still manages to splash across the gap, but there's plenty of time for the dwarf to hightail it out of there if he leaves straight away. If you want more flow then simply open it up in multiple locations into a bigger trench.