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In March 1980, Western Nuclear, Inc. drilled an exploratory core hole 0.7 miles northwest of the Hack II and III mines in northern Arizona. The core was donated to the U.S. Geological Survey to provide background samples of unaltered, unmineralized rock within the Grand Canyon. The core hole is collared in the Harrisburg Gypsiferous Member of the Kaibab Limestone, trangresses the Kaibab Limestone, the Toroweap Formation and Coconino Sandstone, and bottoms out 21.5 ft into the Hermit Shale; the entire interval is of Lower Permian age. The Kaibab Limestone interval in the core contains 155.5 ft of the Harrisburg Gypsiferous Member, consisting of grayish-red to very pale-orange, fine-grained sandstone and calcarenite with bluish-white gypsum and 289.5 ft of the Fossil Mountain Member, containing light-gray to white, fossiliferous, cherty limestone with mudstone. The Toroweap Formation in the core consists of 180 ft of interbedded, yellowish-gray to yellowish-orange dolomite, limestone, sandstone, siltstone, and gypsum of the Woods Ranch Member; 200 ft of light-gray to pale-orange, cherty limestone, dolomite, and siltstone of the Brady Canyon Member; and 32 ft of orange to gray, calcareous sandstone and siltstone of the Seligman Member. The Coconino Sandstone in the core is 46.5 ft thick and contains very pale-orange, crossbedded, slightly calcareous, fine-grained sand. The 21.5 ft of Hermit Shale in the core has the characteristic deep red color, thin, flat laminations and small grain size. Celadonite occurs persistently throughout the Kaibab Limestone interval of the core as a green stain in very thin, wispy clay laminations, and is not found elsewhere in the core. A 2-inch thick layer of pale blue translucent anhydrite occurs at a depth of 166 ft in the core; the rare coloration probably represents a lattice defect. Trace amounts of scattered, very finely disseminated pyrite and marcasite are present in most of the calcareous and fine-grained units in the core; the only significant concentration occurs within thin pods and veins at 156 ft. Geothite is scattered throughout the core as small pods (diameters <0.2 inches), with one larger concentration inside a single vug at 492.5 ft.

Lithology and stratigraphy of a drill core from the vicinity of the Hack Canyon mines, Mohave County, northern Arizona