 KATY, Texas, Feb. 26, 2021 PRNewswire -- U.S. Silica Holdings, Inc. NYSE: SLCA today announced net income of 4.6 million, or 0.06 per basic and diluted share, for the fourth quarter ended December 31, 2020, compared with a net loss of 292.9 million, or 3.99 per basic and diluted... 