X0206 3 2018-05-30 1 0001722287 Unimin Corp CVIA 0001741862 DeMasi Meghan C/O UNIMIN CORPORATION 258 ELM STREET NEW CANAAN CT 06840 0 1 0 0 See Remarks Vice President/Finance and Treasurer Exhibit 24 - Power of Attorney /s/ Andrew D. Eich under a power of attorney 2018-05-30