ROSEN, RESPECTED INVESTOR COUNSEL, Reminds Covia Holdings Corporation f/k/a Fairmount Santrol Holdings Inc. Investors of Important February 8 Deadline in Securities Class Action; Encourages Investor with Losses Exceeding $100K to Contact the Firm – CVIAQ, CVIA, FMSA NEW YORK, Dec. 17, 2020 (GLOBE NEWSWIRE) -- Rosen Law Firm, a global investor rights law firm, reminds purchasers of the securities of Covia Holdings Corporation f/k/a Fairmount Santrol Holdings...