Exhibit 99.1

JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)(1)

THIS JOINT FILING AGREEMENT is entered into as of October 17, 2016, by and among the parties hereto. The undersigned hereby agree that the Statement on Schedule 13D with respect to the common shares, par value $0.01 of Arch Coal, Inc.. and any amendment thereafter signed by each of the undersigned shall be (unless otherwise determined by the undersigned) filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated: October 17, 2016	MONARCH DEBT RECOVERY MASTER FUND LTD
			By: Monarch Alternative Capital LP, its Investment Manager

			By: MDRA GP, its General Partner

			By: Monarch GP LLC, its General Partner



	By:	/s/ Michael Weinstock
		Name: Michael Weinstock
		Title: Member


Dated: October 17, 2016	MONARCH ALTERNATIVE CAPITAL LP
			By: MDRA GP LP, its General Partner

			By: Monarch GP LLC, its General Partner


	By:	/s/ Michael Weinstock
		Name: Michael Weinstock
		Title: Member

Dated: October 17, 2016	MDRA GP LP
			By: Monarch GP LLC, its General Partner



	By:	/s/ Michael Weinstock
		Name: Michael Weinstock
		Title: Member



Dated: October 17, 2016	MONARCH GP LLC


	By:	/s/ Michael Weinstock
		Name: Michael Weinstock
		Title: Member