Item 7.01 Regulation FD Disclosure.
On November 12, 2009, Arch Coal, Inc. issued a press release announcing that it had agreed to lease 731 million tons of coal in the Otter Creek area of Montana from Great Northern Properties. A copy of the press release is attached hereto as Exhibit 99.1.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits The following exhibit is attached hereto and furnished herewith.

Exhibit
No. Description

99.1 Press Release dated November 12, 2009

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Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: November 13, 2009 Arch Coal, Inc.

By: /s/ Robert G. Jones Robert G. Jones Senior Vice President-Law, General Counsel and Secretary

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