Langston & Associates

Geological and Mining Engineers

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Kinross Gold Corporation

New Era Petroleum, LLC.

MT Manroc Development

International Roll Forms,

Golden Sunlight Mines, In

Stillwater Mining Company

Hecla Limited

P.T. Freeport Indonesia

Chevron Mining, Inc.

Dynatec Mining Corporatio

Denison Mines Inc.

Montanore Minerals Corp

GeorgiaPacific Gypsum LLC

Barrick Goldstrike Mines

Sanford Labs

Addwest Minerals Int'l

SK Geotechnical, Inc.

U.S. Silver Corporation

Coeur Alaska, Inc.

Belmont Mining

Contact

Georgia-Pacific Gypsum LLC.

Work Performed: Pillar stability analysis for an underground room and pillar gypsum mine.