U.S. Silica Holdings, Inc. (NYSE: SLCA) today announced that it has signed a multi- year agreement with Wildcat Minerals LLC which provides the Company with potential sand storage and rail capacity at 16 of Wildcat’s sand storage facilities, located near several major unconventional oil and gas shale basins. With the addition of these new sites, the Company now has in basin storage capacity at 40 transloads located near all of the major shale basins in the United States. “We’re very excited about the prospects to bolster our supply chain and logistics capabilities through our strategic relationship with Wildcat,” said U.S. Silica President and Chief Executive Officer Bryan Shinn. “This arrangement will enable us to enter new markets, expand our footprint in existing markets, including the Bakken and the Permian basins and better serve our customers by ensuring that they have greater access to ample supplies of our sand in basin and closer to the wellhead.” Pete Melcher, Chief Operating Officer of Wildcat, commented, “Our Company is very excited about the opportunity to work with one of the country’s premier hydraulic fracturing sand producers. We look forward to forging a mutually beneficial relationship with U.S. Silica as we work together to further enhance their logistics capabilities.” About U.S. Silica U.S. Silica Holdings, Inc., a member of the Russell 2000, is one of the largest domestic producers of commercial silica, a specialized mineral that is a critical input into the oil and gas proppants end market. The company also processes ground and unground silica sand for a variety of industrial and specialty products end markets such as glass, fiberglass, foundry molds, municipal filtration and recreational uses. During its 100-plus year history, U.S. Silica Holdings, Inc. has developed core competencies in mining, processing, logistics and materials science that enable it to produce and cost-effectively deliver over 250 products to customers across these end markets. U.S. Silica Holdings, Inc. is headquartered in Frederick, MD.