CRAFT® STONE AND MASONRY VENEER THAT'S SUPERIOR ON THE INSIDE AND OUT Creative Mines uses a superior mix made up of 70% post-industrial content, which means they eliminate the need for the smokestack-produced fly ash used by other manufacturers. Instead, they use 100% natural pozzolan pumice that enhances natural color and strength, minimizes efflorescence, resists sulfate attack, reduces permeability and improves durability.