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[technophile]

The easiest way (though it pretty much destroys a z-level for use by anything else) is to simply dig straight for the bottom level, then dig a grid pattern through the whole level till you find some warm tiles. You can probably space the grid lines 10 tiles apart and still find it, but I usually do 5 spaces apart just to be 100% sure I get it.

The easiest easiest way is to look for a circle of obsidian at ground level. If you find one, dig (stairs, so the miner can get back out) straight down in the middle of it until you find the top of the magma.

If you don't, then you can resort to exploratory mining.

[JacobGreyson]

Doesn't always work. Magma pipes can just as often appear under a soil-layer, and that doesn't show anything. I had a Magma Pipe appear encased in a Dolomite layer before. While it did make for a wonderfully capable steel production plant, it was a pain to find.