AZGS Chief Geologist Jon Spencer says the Google Earth representation of the ADMMR 2007 “Directory of Active Mines in Arizona” shows three quarries near Sanders. These are the “Houck Silica Sand Pit” north of I-40 and the “Cheto Mine 1” and “Cheto 2” pits south of I-40. All of these appear to be located in the Miocene to Pliocene Bidahochi Formation. The Bidahochi Formation is better known around Hopi Buttes to the northwest, where it includes lake beds and volcanic rocks. He doesn’t know of any detailed studies of the Bidahochi Formation in the Sanders area except for Kiersch & Keller paper (see below). His guess is that the sand pits are located in eolian sands in the Bidahochi Formation.[Right, Sanders and quarries to the east. Credit, Google Maps]
Preferred Sands apparently operates on Din’e Be keyah (Navajo land), where they developed "the first green resin-coated product." The say "Preferred’s products generate significantly less dust, and have no phenol, hexamethylenetetramine, or formaldehyde leaching even under the most extreme down-well conditions, preventing undesired reactions with frac fluids in the well."