X0101 EFFECT 33 LIVE 2010-07-01 17:00:00

S-4

0001037676 ARCH COAL INC 333-165934 0001491143 Otter Creek Coal, LLC 333-165934-23 0001276779 WESTERN ENERGY RESOURCES INC 333-165934-21 0001276782 ALLEGHENY LAND CO 333-165934-20 0001276789 ARCH COAL SALES CO INC 333-165934-19 0001276790 ARCH COAL TERMINAL INC 333-165934-18 0001276772 ARCH ENERGY RESOURCES, LLC 333-165934-17 0001276773 ARCH RECLAMATION SERVICES INC 333-165934-16 0001271501 ARK LAND CO 333-165934-15 0001468708 Ark Land KH, Inc. 333-165934-14 0001308340 Ark Land WR, Inc. 333-165934-13 0001308341 Ark Land LT, Inc. 333-165934-12 0001276791 ASHLAND TERMINAL INC 333-165934-11 0001276795 CUMBERLAND RIVER COAL CO 333-165934-10 0001276797 COAL-MAC INC 333-165934-09 0001276796 LONE MOUNTAIN PROCESSING INC 333-165934-08 0001276771 MINGO LOGAN COAL CO 333-165934-07 0001276774 MOUNTAIN GEM LAND INC 333-165934-06 0001276776 MOUNTAIN MINING INC 333-165934-05 0001276781 MOUNTAINEER LAND CO 333-165934-04 0001468709 Prairie Holdings, Inc. 333-165934-03 0001276792 CATENARY COAL HOLDINGS INC 333-165934-02 0001487833 Arch Development, LLC 333-165934-01