Silica Sand Mining EIS Meeting - Wisconsin Department of Natural .commonly applied to frac sand. Not all silica sands can be used for hydrofracking. To meet the industry specifications, frac sand needs to be nearly pure quartz,.silica sand specifications and pricespdf,Silica Sands of Minnesota - Minnesota DNRaggregates mined from sand and gravel deposits do not meet the specification for frac sand.*. WHAT TYPES OF INDUSTRIES USE SILICA SAND? Silica.