The new mines in that mod are ignored by the mod setting to boost mine damage resistance, making them very hard to use without massive material wastage

Additionally fire immunity would be appreciated, since incendiary weapons clear minefields out in seconds

It works for me when I try it on my machine. Double check that the setting is enabled (it defaults to off). The landmines don't show the resistances on the tooltip, you'd have to look them up in the prototype browser to see them (ctrl-shift-e).