 LOS ANGELES--BUSINESS WIRE--- CVIA classaction--The Law Offices of Frank R. Cruz announces an investigation of Covia Holdings Corporation Covia or the Company fka Fairmount Santrol Holdings Inc. Fairmount Santrol OTC: CVIAQ NYSE: CVIA, FMSA on behalf of investors concerning the Companys possible violations of federal securities laws. If you are a shareholder who suffered a loss, click here to participate. Covia provides minerals and materials solutions for the industrial and energy markets, incl 