The Kaibab National Forest (KNF), located on the Colorado Plateau, is an area largely devoid of base-and precious-metal mineral deposits. Previous assessment of the Grand Canyon region for uranium deposits suggests that the KNF is in an area with undiscovered uranium resources comparable to the San Juan Basin, historically the most productive uranium area in the United States. Quantitative probabilistic mineral resource assessment in the KNF is only possible for uranium due to the absence of appropriate models or to the poorquality of models for other mineral deposit types (e.g., strata-bound copper, manganese deposit types, replacement iron, bedded gypsum, limestone, flagstone, ashlar, basalt, cinder, scoria, and pumice). Industrial minerals, and flagstone production in particular, have been produced in the KNF for about 100 years. Industrial minerals are the likely focus of future production.