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

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Radford B. Langston – Principal, Langston and Associates, Inc.

EDUCATION:

B.A. Geology, Professional Emphasis, University of Montana, 1984.

M.S., Geoscience, Geological Engineering Emphasis, MT Tech of the University of Montana, 2003.

REGISTRATIONS:

NCEES EIT, Montana, 2003.  P.E. Mining and Mineral Processing, Montana, 2004.


EXPERIENCE:

11/2006 – Present                  Consulting Mining Engineer

§  Evaluation of rock mass and excavation conditions.

§  Development of rock mass characterization systems for underground headings and exploration/production drill core.

§  Generation of specific ground support designs or standards.

§  Ground support design for mine portals.

§  Stability analysis of geologic structure for underground and surface excavations.

§  Mine-wide audits in concert with mine personnel to gauge the overall effectiveness of ground control programs.

§  Training of staff on the fundamental mechanics of rock support in terms of classroom training or ground control reference manuals.

§  Evaluation of rock mass properties in machine excavated underground workings.

§  Design and evaluation of ground support for machine excavated underground workings.

§  Rock mass evaluation and analysis for vertical bored and blasted openings.

§  Development of large sublevel stoping geotechnical and rock engineering programs.

§  Development of large sublevel stoping geology and grade control programs.

§  Root cause analysis for stability problems in block cave mines.

§  Analysis of load, bending stress, and deflection of steel set ground support.

§  Pillar stability analysis for underground room and pillar operations.

§  Finite element modeling and boundary element analysis of excavations.

§  Risk analysis of various mining operation aspects by fault tree analysis.

§  Proposals and prefeasibility studies to recover lost ore production.

§  Testing and analysis of ground support components.

§  Testing and analysis of rock mass properties.

§  Rock mass analysis and ground support design in extremely poor ground conditions.

§  Rock mass analysis and ground support design in Arctic permafrost conditions.

2000 –11/2006            Stillwater Mining Company Nye, MT, Senior Rock Mechanics Engineer

§  All listed as Rock Mechanics Engineer plus:

§  Supervised mine site rock mechanics engineers.

§  Rock engineering oversight for 2 mines.

§  Ground support design and stability evaluation for TBM tunnels.

§  Developed ground support design manual for mine operators.

§  Refined and maintained paste backfill stability criteria for underhand mining.

§  Analysis of slurry and cemented backfill retainment walls.

§  Finite element modeling, kinematic wedge analysis, and boundary element analysis in underground excavations.

§  Developed empirical fracture analysis methodology in conjunction with expert consultant.

§  Conducted fault tree analysis for various operational faults.

§  Stability analysis of assorted mining methods.

§  Devised system to mine in extremely poor to caved-in ground conditions.

§  Developed techniques to ensure long-term stability of muck passes.

1995–2000      Stillwater Mining Company Nye, MT, Rock Mechanics Engineer

§  Set-up geotechnical drill core logging and underground data collection systems.

§  Designed ground support for specialized application and mining ground support standards using a variety of classification systems including Q-NATM, RMR and Matthews analysis.

§  Developed and maintained methodology for geotechnical prediction and analysis of production stopes and development headings from diamond drilling information.

§  Installation, reading and data reduction of rock mechanics instrumentation including over core stress analysis.

§  Risk analysis of underground excavations.

§  Surface geotechnical reconnaissance using air photos and field mapping.

  • Maintained liaison with outside expert rock engineering consultant

1985–1995      Stillwater Mining Company Nye, MT, Mine Geologist

§  Mapped and sampled underground headings.

§  Logged and sampled diamond drill core.

§  Designed and managed underground diamond drilling programs.

§  Mapped underground development drifts.

§  Provided geologic information for stope and development planning purposes.

§  Conducted geologic interpretation of the ore body and surrounding rocks.

§  Ran geostatistical models and ore reserves.