 KATY, Texas, Oct. 15, 2021 PRNewswire -- U.S. Silica Holdings, Inc. NYSE: SLCA announced today that it will release its third quarter 2021 financial results before the New York Stock Exchange opens on Friday, October 29, 2021. Conference Call This release will be followed by a conference call for investors on Friday, October 29, 2021 at 7:30 a.m. 