Exhibit 24
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that the undersigned Senior Vice President and
Controller of Covia Holdings Corporation, a Delaware corporation ("Company"), in connection
with the preparation and filing of reports on Form 3, 4 and 5 (as well as applications for EDGAR
filer identification numbers and any other reports required under Section 16(a) of the Securities
Exchange Act of 1934) and Form 144, if required under the Securities Act of 1933, on my behalf
including, but not limited to, those cases where time is short or I am unavailable to review the
form, hereby constitute and appoint Chadwick P. Reynolds, Andrew D. Eich, Erin M. Burke,
Gregory S. Harvey and Gregory J. Dziak, and each of them (with full power to each of them to
act alone), the undersigned's true and lawful attorneys-in-fact and agents, for the undersigned
and on the undersigned's behalf and in the undersigned's name, place and stead, in any and all
capacities, to prepare, sign, and file with the Securities and Exchange Commission reports on
Form 3, 4 and 5 (as well as applications for EDGAR filer identification numbers and any other
reports required under Section 16(a) of the Securities Exchange Act of 1934) and Form 144, if
required under the Securities Act of 1933, together with all amendments thereto, with all exhibits
and any and all documents required to be filed with respect thereto with the Securities and
Exchange Commission and any other regulatory authority granting unto such attorneys-in-fact,
and each of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done in order to effectuate the same as fully to all intents and
purposes as the undersigned might or could do in person, hereby ratifying and confirming all that
said attorneys-in-fact and agents, or any of them, might lawfully do or cause to be done by virtue
hereof. The undersigned agrees that each attorney-in-fact may rely entirely on information
furnished orally or in writing by or at the direction of the undersigned to such attorney-in-fact.
This Power of Attorney shall remain in full force and effect until the undersigned is no longer
required to file Form ID, Form 3, Form 4, Form 5 and Form 144 (including amendments thereto)
with respect to the undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing delivered to the
attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has signed this Power of Attorney as of September
12, 2019.
/s/ Rory O'Donnell
Rory O'Donnell
Senior Vice President and Controller
