AK Coal Resources, Inc.

Akens Engineering 

Alpha Natural Resources

Britt Energies, Inc.

Civil & Environmental Consultants, Inc.

CME Engineering, LP

Curry & Associates Engineers, Inc.

DiGioia & Gray Associates, LLC

EARTHRES

EQT

Fike Associates, Inc.

G & C Coal Analysis Laboratory, Inc.

G Force Engineering Services, LLC

Geo-tech Engineering, Inc.

Hess & Fisher Engineers, Inc.

Hiser Engineering, Inc.

L R Kimball

Mahaffey Laboratory, LTD

Martin Limestone, Inc.

Meiser & Earl, Inc.

Minetech Engineers

Moody & Associates, Inc.

Musser Engineering, Inc.

North American

New Enterprise Stone & Lime Co., Inc.

Corsa Coal Corp.

Quality Aggregates

Rockwood Casualty

Rosebud Mining Company

Skelly & Loy, Inc.

Snyder Associated Companies

The EADS Group

Valier Coal Yard

W.D. Mohney & Associates

Wilson Creek Energy, LLC​