Nice mod, but the recipe feels too expensive to me, especially considering that cliff explosives have a far larger area of effect.

Maybe cheap excavation feels too cheaty, but if the player wants to mess with biter path-finding that's really up to them.

I've decided to try playing with this (a lot cheaper):

data:extend({
  {
    type = "recipe",
    name = "blasting-charge",
    energy_required = 8,
    enabled = false,
    category = "crafting",
    ingredients =
    {
      {"grenade", 1},
      {"empty-barrel", 1},
      {"explosives", 3}
    },
    result= "blasting-charge",
    result_count = 3
  }
})