Goodyguy Have you ever used that stuff? I'm curious about its use on claims/ national forest/ ect. ect. Any information you could provide about it's use/restriction in regards to mining would be greatly appreciated. I can think of hundreds and hundreds of places I'd love to pour this stuff. Also what kind of evidence is left behind from the product? How is it I never knew about this stuff??For the tough ones there is always BUSTAR non explosive expansion grout: Chemical Demolition Agent: Non-Explosive Concrete Demolition