Arch Coal and Great Northern Properties Enter into Montana Coal Lease on Otter Creek Reserves

Arch Coal and Great Northern Properties Enter into Montana Coal Lease on Otter
Creek Reserves

ST. LOUIS, Nov. 12 /PRNewswire-FirstCall/ -- Arch Coal, Inc. (NYSE: ACI) and
Great Northern Properties Limited Partnership (GNP) announced today that they
have signed a coal lease comprising all of GNP's coal resources in the Otter
Creek Tracts located in southeastern Montana. The coal lease will give Arch
the right to mine approximately 9,600 acres of GNP-owned minerals that
encompass approximately 731 million tons of high-quality, low-cost
sub-bituminous coal reserves. As consideration for entering into the lease,
GNP will receive a front-end bonus of $0.10 per ton, or $73.1 million, which
will be payable in equal annual installments over a five-year period.

"The lease of GNP's Otter Creek reserves provides an attractive future growth
opportunity for Arch to build a significant position in the Northern Powder
River Basin coal region," said Steven F. Leer, Arch's chairman and chief
executive officer. "We believe future development of these Montana coal
reserves will help competitively serve the northern U.S. power generation
market, provide Arch with an additional supply source to export into the fast
growing Pacific Rim coal market or possibly house the site of a future
coal-conversion facility. Investing in these low ratio reserves now will give
us a future cost advantage in the domestic and international energy markets."

"We are pleased to have Arch, a world-class coal company, develop some of
GNP's most significant reserves," said Corbin J. Robertson, Jr., chairman and
chief executive officer of GNP.

The 731 million tons of low-ratio, sub-bituminous coal reserves, which are low
in sulfur dioxide content, are located in the Ashland coalfield southeast of
Billings, Mont. These reserves would support the future development of a
large-scale, dragline-operated surface coal mine.

The consummation of the Arch-GNP Otter Creek Coal Lease comes on the eve of
the State of Montana potentially putting its interests in the Otter Creek coal
reserves up for lease as well. The state's ownership comprises about one-half
of the Otter Creek area - with GNP and the state owning their respective
interests in a checkerboard pattern.

St. Louis-based Arch Coal is the second largest U.S. coal producer. Through
its national network of mines, Arch supplies cleaner-burning, low-sulfur coal
to U.S. power producers to fuel roughly 8 percent of the nation's electricity.
The company also ships coal to domestic and international steel manufacturers
as well as international power producers.

Houston-based Great Northern Properties is a privately owned land management
company with its lands and minerals largely concentrated in Montana and North
Dakota. Formed in 1991 by the Robertson family and American Bailey Mining
Limited Partnership to acquire these lands from Burlington Northern Railroad,
GNP is the largest private owner of coal reserves in the United States.

Forward-Looking Statements: This press release contains "forward-looking
statements" - that is, statements related to future, not past, events. In this
context, forward-looking statements often address our expected future business
and financial performance, and often contain words such as "expects,"
"anticipates," "intends," "plans," "believes," "seeks," or "will."
Forward-looking statements by their nature address matters that are, to
different degrees, uncertain. For us, particular uncertainties arise from
changes in the demand for our coal by the domestic electric generation
industry; from legislation and regulations relating to the Clean Air Act and
other environmental initiatives; from operational, geological, permit, labor
and weather-related factors; from fluctuations in the amount of cash we
generate from operations; from future integration of acquired businesses; and
from numerous other matters of national, regional and global scale, including
those of a political, economic, business, competitive or regulatory nature.
These uncertainties may cause our actual future results to be materially
different than those expressed in our forward-looking statements. We do not
undertake to update our forward-looking statements, whether as a result of new
information, future events or otherwise, except as may be required by law. For
a description of some of the risks and uncertainties that may affect our
future results, you should see the risk factors described from time to time in
the reports we file with the Securities and Exchange Commission.

SOURCE Arch Coal, Inc.

Media: Kim Link, +1-314-994-2936, or Investors: Deck Slone, +1-314-994-2717,
both of Arch Coal, Inc.