 KATY, Texas, May 3, 2021 PRNewswire -- U.S. Silica Holdings, Inc. NYSE: SLCA today released its Corporate Responsibility Report, summarizing the companys global sustainability activities, performance and results from calendar year 2020. The report provides a look at how U.S. Silica is operating to make positive impacts both in its internal community and on the communities in which it operates, and contributing to sustainable products used around the world. 