User blog comment:Kogath/Monster Hunter: World Discussion/@comment-184612-20170727021354/@comment-27120688-20170727220356

Just wanted to clarify that the LBG is not laying down mines. It is laying down what looks to be heat flares. You can see the heat streams coming off from them. The Gunner then uses explosive shells that react to the heat.

Further proof to this is that the flares do not disappear after a single explosion.