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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Lang Paul A
(Last) (First) (Middle)
ONE CITY PLACE DRIVE
SUITE 300
(Street)
ST. LOUIS MO 63141
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ARCH COAL INC [ ACI ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Senior VP - Operations
3. Date of Earliest Transaction (Month/Day/Year)
02/23/2007
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 02/23/2006 A 834 A (1) 834 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (2) 02/23/2007 M 834 (3) (4) Common Stock 834 (1) 1,666 D
Employee Stock Option (right to buy) $32.99 02/22/2007 M 61,750 (5) 02/21/2017 Common Stock 61,750 $0.00 61,750 D
Explanation of Responses:
1. The reporting person received 2,500 restricted stock units on February 23, 2006. The restricted stock units vest ratably over a three-year period. Upon vesting of 834 restricted stock units on February 23, 2007, the reporting person received 834 shares of common stock.
2. Each restricted stock unit represents a right to receive one share of common stock unless otherwise deferred, at the reporting person's election, pursuant to the Arch Coal, Inc. Executive Deferred Compensation Plan.
3. The reporting person received 2,500 restricted stock units on February 23, 2006. The restricted stock units vest ratably over a three-year period. On February 23, 2007, 834 restricted stock units vested.
4. The restricted stock units do not expire.
5. The option vests in three equal annual installments beginning on February 22, 2008.
Remarks:
/s/ Gregory A. Billhartz, Attorney-in-Fact 02/27/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
POWER OF ATTORNEY

	The undersigned, appoints the following individuals, with full power to each of
them to act alone, as his true and lawful attorneys-in-fact and agents to
execute and file on behalf of the undersigned all Forms 3, 4 and 5, and any
amendments thereto, that the undersigned may be required to file with the
Securities and Exchange Commission, and any stock exchange or similar authority,
as a result of the undersigned's ownership of or transactions in securities of
Arch Coal, Inc.  The authority of the following individuals under this Power of
Attorney shall continue until the undersigned is no longer required to file
Forms 3, 4 and 5 with regard to the undersigned's ownership of or transactions
in securities of Arch Coal, Inc., unless earlier revoked in writing.  The
undersigned acknowledges that the following individuals are not assuming any of
the undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.
	The following Officers of Arch Coal, Inc.:

		Secretary of the Corporation

		Assistant Secretary of the Corporation

		General Counsel of the Corporation

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 7th day of December, 2006.




						/s/ Paul A. Lang
						Paul A. Lang