Tranche Update on Arch Resources, Inc.'s Equity Buyback Plan announced on May 2, 2017.

Arch Resources, Inc. is a coal producer and a producer of metallurgical coal. The Company sells substantially all of its coal to steel mills, power plants and industrial facilities. It is a producer of metallurgical products for the global steel industry, and the supplier of High-Vol A metallurgical coal globally. The Company has two distinct lines of business, metallurgical and thermal, and may include a number of mine complexes. It operates about seven active mines located in three of the major coal-producing regions of the United States. Leer and Leer South longwall mines anchor its large-scale, first quartile metallurgical franchise. The Leer and Leer South operations are complemented by the Beckley and Mountain Laurel continuous miner mines, which in aggregate provide it with a full suite of metallurgical products for sale in the global metallurgical market. The Company also operates thermal mines in the Powder River Basin and Colorado that produce thermal coal.