SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                           ----------------------------

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


  Date of Report (Date of earliest event reported): May 29, 2003 (May 29, 2003)

                                Arch Coal, Inc.
              (Exact name of registrant as specified in its charter)

         Delaware                        1-13105                43-0921172
(State or other jurisdiction     (Commission File Number)    (I.R.S. Employer
    of incorporation)                                        Identification No.)


               One CityPlace Drive, Suite 300, St. Louis, Missouri 63141
                 (Address of principal executive offices)       (Zip code)


         Registrant's telephone number, including area code: (314) 994-2700














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                         Exhibit Index begins on page 4.







Item 5. Other  Events.

     On May 29, 2003,  Arch Coal,  Inc.  (the  "Company"),  announced  via press
release  that it had  signed a  definitive  agreement  to  acquire  Vulcan  Coal
Holdings  LLC,  which  owns all of the  equity of  Triton  Coal  Company,  for a
purchase  price  of $364  million.  A copy of the  Company's  press  release  is
attached hereto and incorporated herein by reference in its entirety.


Item 7.  Financial Statements and Exhibits.

         (c) The following Exhibit is filed with this Current Report on Form
8-K:

           Exhibit No.               Description
            99                        Press Release dated as of May 29, 2003




























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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:  May 29, 2003                   ARCH COAL, INC.



                                       By:  /s/ Janet L. Horgan
                                          Janet L.Horgan
                                          Assistant General Counsel and
                                            Assistant Secretary































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                                  EXHIBIT INDEX


Exhibit No.                 Description

99                         Press Release dated as of May 29, 2003





































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                                                                      Exhibit 99

News from
Arch Coal, Inc.
--------------------------------------------------------------------------------
                                                        FOR FURTHER INFORMATION:
                                                                   Deck S. Slone
                                                                 Vice President,
                                                   Investor and Public Relations
                                                                  (314) 994-2717
                                                           FOR IMMEDIATE RELEASE
                                                                    May 29, 2003


Arch Coal Signs Definitive Agreement to Acquire Triton Coal Company

     St. Louis - Arch Coal, Inc. (NYSE:ACI) announced today that it had signed a
definitive  agreement to acquire Vulcan Coal Holdings LLC, which owns all of the
equity of Triton Coal Company,  for a purchase price of $364 million.  Triton is
the  nation's  seventh  largest  coal  producer and the operator of two mines in
Wyoming's Powder River Basin. These mines, North Rochelle and Buckskin, produced
a combined  total of 42.2  million  tons of coal in 2002 and are  supported by a
reserve base of  approximately  744 million tons.  Triton Coal Company had total
revenues of $289.2 million in 2002.

     "We are  excited  about  this  acquisition  and  its  potential  to  create
long-term  value  for  our  shareholders   and  substantial   benefits  for  our
customers,"  said Steven F. Leer,  Arch  Coal's  president  and chief  executive
officer.  "One of our principal growth  strategies is to build upon our existing
position in  Wyoming's  Powder River  Basin,  which is the nation's  largest and
fastest  growing  coal  supply  region.  We view Triton as an ideal fit with our
existing  operations  in the  basin.  The  addition  of  Triton  creates  unique
opportunities for operating synergies between the combined  companies,  enhances
our  portfolio  of product  offerings,  and  increases  our PRB reserve  base by
approximately 50%."

     Leer indicated that the acquisition is expected to be accretive to earnings
and cash flow immediately.

     James M. Hake, president and chief executive officer of Triton,  added: "We
are very  excited  about  this  transaction,  which we think  promotes  the best
interests of our customers and employees,  and provides liquidity to our current
investors."

Triton's operations

     The North  Rochelle  mine is located near the town of Wright,  Wyo., in the
southernmost  tier of the PRB, and shares a 5.5-mile  property  line with Arch's
existing Black Thunder mine. Like Black Thunder, North Rochelle is strategically
located on the joint rail line operated by the Union Pacific and BNSF railroads,
which gives it  cost-competitive  access for a very broad  geographic  area.  In
2002,  North Rochelle  produced 23.9 million tons of coal. It currently  employs
287 people and operates on a reserve base of approximately 250 million tons.


     North Rochelle  possesses one of the highest  quality  reserve bases in the
PRB,  with an average  heat content of  approximately  8800 Btus per pound and a
sulfur content of just over 0.5 pounds of sulfur dioxide (SO2) per million Btus.
(Coal with a sulfur  content of less than 1.2 pounds of SO2 per million  Btus is
characterized  as  "compliance"  quality,  which  means  that it meets  the most
stringent  standards  of the Clean  Air Act;  North  Rochelle's  output is often
characterized as "super-compliance.")

     "Because of its extremely low sulfur content,  North  Rochelle's  output is
regarded  as highly  desirable  by many  customers  and  earns a premium  in the
marketplace,"  Leer said.  "The addition of this  super-compliance  product will
enable  us to serve a new  group of  customers,  while  expanding  the  slate of
products we can offer to our existing customer base."

     The Buckskin mine is located near Gillette,  Wyo., on the BNSF rail system.
It produces 8400-Btu,  compliance quality coal. In 2002,  Buckskin produced 18.3
million  tons of coal.  It employs  195 people and  operates  on a reserve  base
totaling 494 million tons.

     "As demand for Powder River Basin coal grows,  we expect  8400-Btu  coal to
become increasingly  attractive," Leer said.  "Buckskin provides us with a solid
foundation of production and reserves from which to serve these growing needs."

     The two mines employ an  equipment  fleet that  includes a dragline,  seven
electric shovels,  and a fleet of 24 trucks ranging in size from 190 tons to 320
tons.  North  Rochelle  employs  a  state-of-the-art,  high-capacity  unit-train
loading facility.

Operating synergies

     "We expect significant  operating synergies from the combined  operations,"
Leer said. "We have identified  significant  opportunities  for cost savings and
productivity   improvements   across  all  the   operations   in  the  areas  of
administration,  purchasing  and inventory  management,  and we see even greater
potential  for  savings  through  the  integration  of Black  Thunder  and North
Rochelle."  Leer  indicated that Arch would also apply its expertise in the area
of GPS-enabled equipment dispatch at the Triton operations.

     As previously noted,  North Rochelle and Arch's existing Black Thunder mine
are  contiguously  located.  Leer indicated that the  optimization of the mining
sequence  at the two mines,  as well as the more  efficient  utilization  of the
combined equipment fleet and rail loadouts, should deliver significant benefits.

     Moreover,  Leer noted that Arch has a proven  track  record as an efficient
operator in the PRB.  "Since the  acquisition  of the Black Thunder mine in June
1998, we have increased the mine's  productivity  by  approximately  13% and now
rank as the most productive operator in the basin," Leer said.

The expanded company

     "The Powder River Basin is well  positioned  to serve the nation's  growing
demand for  clean-burning,  low-cost fuel for electric  generation,"  Leer said.
"Over the past 10 years,  demand for PRB coal has grown at a 6% compound  annual
growth rate as it has taken sales from other geographic regions. We believe that
it will  maintain  that robust  level of growth  well into the future.  With the
acquisition of Triton, we have created a strong platform for future growth."

     The acquisition increases Arch's total reserves in the PRB by approximately
50%, from 1.4 billion tons to 2.1 billion tons.


     Although Arch  anticipates a small reduction in  administrative  staff, the
company  expects  to retain the great  majority  of the  Triton  workforce.  "We
believe  the men and women of Triton  Coal will be a valuable  addition  to Arch
Coal," Leer said.  "The sharing of skills,  knowledge and ideas  represents  yet
another  synergy  that  should  create  value  and make the  combined  company a
stronger competitor in the future."

     Arch  will  finance  the  acquisition  with cash and  borrowings  under its
existing bank revolver.

     Consummation of the transaction is conditioned upon obtaining all necessary
governmental and regulatory consents and other customary conditions.  The boards
of Arch Coal and Vulcan Coal Holdings LLC have approved the transaction.

     "With the completion of this  acquisition,  Arch will have strengthened its
position  as a major  supplier  of  clean-burning,  low-sulfur  coal in both the
eastern and western United States," Leer said. "With natural gas in short supply
and extended outages planned at some of the nation's nuclear power plants, it is
becoming increasingly evident that coal must play a vital role in satisfying the
nation's  future  energy  requirements.  We believe  that Arch is  strategically
positioned to serve these growing needs."

     Rothschild  Inc.  acted as  financial  advisor to Vulcan Coal  Holdings and
Triton in the transaction.

     Arch Coal is the nation's  second  largest coal producer,  with  subsidiary
operations in West Virginia,  Kentucky,  Virginia,  Wyoming,  Colorado and Utah.
Through these  operations,  Arch Coal provides the fuel for  approximately 6% of
the electricity generated in the United States.

     Forward-Looking Statements:  Statements in this press release which are not
statements of historical fact are  forward-looking  statements  within the "safe
harbor" provision of the Private Securities Litigation Reform Act of 1995. These
forward-looking  statements are based on information currently available to, and
expectations and assumptions  deemed  reasonable by, the company.  Because these
forward-looking  statements  are  subject  to various  risks and  uncertainties,
actual results may differ  materially  from those  projected in the  statements.
These  expectations,   assumptions  and  uncertainties  include:  the  company's
expectation  of  continued  growth  in  the  demand  for  electricity;  expected
synergies   resulting  from  the   acquisition;   belief  that  legislation  and
regulations  relating to the Clean Air Act and the  relatively  higher  costs of
competing  fuels will increase  demand for its compliance  and low-sulfur  coal;
expectation of improved  market  conditions  for the price of coal;  expectation
that the company will  continue to have  adequate  liquidity  from its cash flow
from operations, together with available borrowings under its credit facilities,
to finance  the  company's  working  capital  needs;  a variety of  operational,
geologic, permitting, labor and weather related factors; and the other risks and
uncertainties  which are described  from time to time in the  company's  reports
filed with the Securities and Exchange Commission.