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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Description of Services

The following are services performed by the consultant.

·       Develop rock mass characterization system for both underground headings and exploration/production drill core.  These characterization systems can be built to be used by the operators or performed by the consultant on a periodic basis. 

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

·       Rock mass analysis and design of ground support systems for very poor ground conditions especially for mine portals.

·       Development of specific ground support designs or standards for given ranges of rock mass conditions that consider rock mass quality, support fixture capacity, excavation longevity, and method of ground support installation. 

  • Stability analysis of geologic structure for underground and surface excavations.
  • Finite element modeling and boundary element analysis of excavations. 

·       Evaluation of rock mass properties in machine excavated underground workings and design and evaluation of ground support.

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

·       Rock mass evaluation and analysis for vertical bored and blasted openings and suggest techniques to ensure long-term stability of muck passes.

·       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.

·       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.

·       Employ empirical fracture analysis methodology.

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

·       Surface geotechnical reconnaissance using air photos and field mapping.

  • Training of miners and mine operators in the fundamental mechanics of rock support plus providing classroom training of personnel and/or develop ground control reference manuals.  
  • Stability analysis of paste and cemented rock backfill.
  • Analyses for backfill barricade walls.
  • Conduct risk analysis on many aspects of a mining operation, but especially ground control related topics.  The risk analysis can be developed on a subjective basis and then converted to an objective analysis by group participation in a process called fault tree analysis.
  • Assist operations in developing techniques and approaches to mitigate ground control problems and facilitation of a mine-wide audit in concert with operations personnel to gauge the overall effectiveness of the ground control program in place. 
  • Provide feedback loop to determine if support designs are being followed or if the designs themselves are appropriate for the conditions to which they are applied.