X0206 3 2018-05-30 1 0001722287 Unimin Corp CVIA 0001738234 Deleersnyder Jean-Luc C/O UNIMIN CORPORATION 258 ELM STREET NEW CANAAN CT 06840 1 0 0 0 Jean-Luc Deleersnyder (the "Reporting Person") is the Chief Executive Officer and Member of the Executive Committee of SCR-Sibelco NV, a shareholder of Unimin Corporation (to be renamed Covia Holdings Corporation, the "Company"). The Reporting Person disclaims beneficial ownership of any securities of the Company reported by SCR-Sibelco NV except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for the any other purpose. Exhibit 24 - Power of Attorney /s/ Andrew D. Eich under a power of attorney 2018-05-30