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Providing mine engineering services to the world's mining industry since 1983.


For over 33 years Independent Mining Consultants
has been known for their professional mining expertise that is greatly enriched by a multi-disciplinary technical staff. The experience of IMC personnel is enhanced with use of the most modern computerized analytical tools and mine design capabilities.

IMC was started in 1983 by the following same three persisting principals. Since then the company has grown to a specialized group of 15 individuals. The principals' longevity in IMC demonstrates the reliable and rich mine engineering consulting experience that the company has to offer.

President – John M. Marek, P.E.

M.S. Mining Engineering (Colorado School of Mines)  ‐  B.S. Physics (Colorado School of Mines)

40 years of experience in the minerals industry.  Mr. Marek shares responsibility of all aspects of project engineering and management of this multi-disciplined mining consulting group.  Financial analysis, mine planning, reserve verification and review are some of the areas of his expertise.  Project specialties include determination of mine operating policy integrating all disciplines and constraints.

Vice President – Herbert E. Welhener

B.S. Geosciences (Geology) (University of Arizona)

45 years' experience in mining industry.  Mr. Welhener shares the responsibility of project management and engineering of this mine consulting group.  Areas of expertise include mine planning, mine finance and mine design for all sizes of mining operations.

Vice President – Michael G. Hester

M.S. Mining Engineering (University of Arizona)  ‐  B.S. Mining Engineering (University of Arizona)

40 years of experience in the minerals industry.  Mr. Hester’s responsibilities include, but are not limited to, management of mining feasibility studies, ore reserve estimation and verification, and computer applications to mine planning.

Thank You!

We wish to thank the mining community for your support during the past 33 years and IMC looks forward to serving our existing and new clients well into the future.

The technical staff of Independent Mining Consultants has worked very well together for over three decades.  The synergies of talent within the organization are tremendous.  The mining engineers work directly with IMC’s data analysts, and the geologists and draftsmen have good working relationships.  IMC’s technical documents and illustrations are most professional and have been reviewed and accepted by Canadian and U.S. financial and regulatory agencies.

Our Recent Projects

View our Project Map »

  • Marathon Project

    Stillwater Mining Co.

    Ontario, Canada
  • Chillito Project

    Asarco LLC

    Arizona, USA
  • CEMEX Gypsum

    National Gypsum Co.

    Arizona, USA
  • La Cigarra Project

    Coeur Mining, Inc.

    Chihuahua, Mexico
  • Amulsar Gold

    Lydian International Ltd.

    Vayots Dzor, Armenia
  • Mogollon

    Sage Associates

    New Mexico, USA
  • Drake Cement

    Drake Cement

    Arizona, USA
  • Bayovar 12

    Focus Ventures Ltd.

    Piura, Peru
  • Mulatos

    Alamos Gold Inc./Mina de Oro Nacional

    Sonora, Mexico
  • Sierrita Mine

    Freeport McMoRan Inc.

    Arizona, USA