I'm new to the forums, but I saw this in passing.
I happen to own a Thinkpad T60, and last time I tried booting from a USB on it, I believe I had to set the "boot" partition flag on the USB for it to boot correctly.
You can do this with GParted, or the parted command line tool, for example with parted:
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parted /dev/sdb1 set 1 boot on
Not exactly sure what tool to use from a Mac, since I don't own one, but hopefully this is a helpful tip.
You may also be able to use Disk Utility under the Utilities folder in Applications to copy the image to the USB, after you convert the Mint ISO to a DMG.
Hope this helps!