Sisecam Chemicals USA SC 13D Ciner Resources / Sisecam Chemicals USA ownership change

Exhibit A

Joint Filing Agreement

We, the undersigned, hereby express our agreement that the attached Schedule 13D is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This agreement may be terminated with respect to the obligations to jointly file future amendments to such statement on Schedule 13D as to any of the undersigned upon such person giving written notice thereof to each of the other persons signatory hereto, at the principal office thereof.

Dated: December 30, 2021

SISECAM CHEMICALS USA INC.
By:	/s/ MUSTAFA GÖRKEM ELVERICI
	MUSTAFA GÖRKEM ELVERICI
	DIRECTOR
SISECAM CHEMICALS WYOMING LLC
By:	/s/ MUSTAFA GÖRKEM ELVERICI
	MUSTAFA GÖRKEM ELVERICI
	DIRECTOR
SISECAM CHEMICALS RESOURCES LLC
By:	/s/ MUSTAFA GÖRKEM ELVERICI
	MUSTAFA GÖRKEM ELVERICI
	DIRECTOR
SODA SANAYII A.S.
By:	/s/ MUSTAFA GÖRKEM ELVERICI
	MUSTAFA GÖRKEM ELVERICI
	DIRECTOR
TÜRKIYE ŞIŞE VE CAM FABRIKALARI A.Ş.
By:	/s/ MUSTAFA GÖRKEM ELVERICI
	MUSTAFA GÖRKEM ELVERICI
	DIRECTOR