Geotechnical Logging Services

Wireline Workshop (Pty) Ltd

This is a mining and exploration service company devoted to the geophysical logging of boreholes drilled to intersect sub-surface targets such as coal, iron ore and potash.

Our management, previously employed with BPB, Reeves and Weatherford, has over 45 years of hard-won experience, describing mining targets from remote Mongolian coal to Chilean copper and deep South African gold.

We also offer specialised services to the Civil Engineering sector such as structural information used for placement of bridges, tunnels and dam wall foundations.  Our robust but carefully calibrated measurements are designed for application in all mineral exploration fields from coal through base and precious metals to unconventional hydro-carbons such as CBM and tight shale gas. Client requirements vary from mineral type to location, whereby consultation is offered at all stages throughout the duration of the work. Combining services, depending on our clients' objectives, we can deliver precise and accurate results in;

  • Gyroscopic borehole navigation
  • Borehole imaging services
  • Geotechnical analyses
  • Mechanical properties/rock strength/slope stability
  • Structural logs of bedding, fractures and stress orientation
  • Structure log interpretation
  • Correlation between distant rock formations
  • Locating mineralisation zones with depth and thickness
  • Stratigraphic well logging for oil & gas applications
  • Carbon sequestration
  • Coal and coalbed methane  
  • Hydrogeological studies 
  • Flow rate profiles for ground water investigation

Wireline Workshop Bulletin

The bimonthly bulletin on mineral wireline logging is designed to explain and illustrate a complex technology to geologists and loggers.


Accurate borehole navigation

Track the borehole! We are offering a brand new Geovista North Seeking Gyro. With real time recording and display. You can now profile your well in almost any environment. The Gyro can be run in any situation including magnetic formations and through a casing or drill pipe. This north seeking gyro can accurately survey all borehole profiles from vertical to near horizontal at high latitudes or inclinations with no reduction in accuracy. No surface equipment is required or calibration. This is a cost effective option in a market with limited suppliers of this expensive service

Example wireline log


Mineral wireline logging

Mineral wireline logging, which is really an offshoot of oilfield wireline logging, is a process in which an electronic tool, probe or “sonde” is lowered into a borehole in order to make measurements of physical rock mass properties and borehole trajectory, structural setting and fluid properties

Measurements employ electro-magnetic fields (directly or induced), radiation (natural and introduced via a chemical source) and sonic energy to interrogate the rock mass without physically breaking it. 

The sonde is lowered on a cable or “wireline” which transmits both power to the sonde and data from it to the surface recording systems. The data is proportional to analogue voltages produced by the various detector types. It must be calibrated and compensated for borehole effects in order to become a quantitative measurement. Examples are natural gamma ray, density, sonic transit time and resistivity.

Logs might describe or estimate the lithology, the local structure, rock strength, borehole direction and various fluid parameters such as temperature and conductivity. Wireline logs are routinely used in mineral exploration to describe coal seams in terms of depth, thickness and ash content. They have applications in all forms of mineral exploration, including base and precious metal projects

Wireline Workshop's role, as well as capturing log data, is to increase the value gained from drilling projects by assisting in the choice of applicable measurements, operational planning, calibration, data processing, analysis, presentation and reporting.

Quality Service

The Team

No other local logging company offers the experience and knowhow provided by Wireline Workshop. This team can provide in-depth operational planning, outcome prediction and post operational analysis based on over 80 years of hard-won experience throughout the world.

Image of Marcus Chatfield, Owner of Wireline Workshop CC

Marcus Chatfield

Managing director

Formerly managing Reeves Mineral Services and Weatherford, now co-owning Wireline Workshop, Marcus has 37 years of experience in borehole logging. He regularly gets involved with data capture and provides high level log analysis and reporting services. His Wireline Workshop bi-monthly bulletin is in its seventh year.

Image of John Jeffrey

John Jeffrey

Operations Director

John is a very experienced stalwart of the mineral logging business, having begun logging boreholes in 1979. He is currently directing operations at Wireline Workshop. He has global work experience (Alaska, Colombia, Philippines, Mongolia etc) on a range of mineral targets.

Image of Thatong Moshola

Lerato Moagi

Wireline Log Analyst

Lerato has a degree in geology and ten years’ experience in borehole logging and log analysis. She is responsible for data processing and record keeping as well as calibration frequency.

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Abram Manzini

Special Projects Manager

Abram is our Special Projects manager. He operates on complex or remote operations in Africa. He has logged boreholes in South Africa, Angola, DRC, Rep of Congo, Zimbabwe, Botswana and Zambia.

Image of Thatong Moshola

Warren Goodwin

Senior Logging Engineer

Warren has over ten years’ experience in wireline logging for minerals throughout Africa. He is responsible for Western Operations and is the assistant to the Operations Director. He has recently operated in Zambia, Zimbabwe and the Republic of Congo.

Image of Thatong Moshola

Daniel Jacobs

Senior Logging Engineer

Daniel operates from our Highveld Base near Middelburg. He is responsible for all Eastern Operations and the development of the coal logging service. Daniel has over ten years’ experience in the Highveld Coalfield. He is currently working on an improved geotechnical logging service in coalfield applications.

Our Testimonials

Zaaiman Exploration Drilling (pty) Ltd

Zaaiman Exploration Drilling is a drilling company operating in the Witbank area, South Africa.

The company currently employs Wireline Workshop CC to conduct wireline logging at our vertical surface and directional drilling projects in and around Witbank.

I confirm that the company is satisfied with the work performed by Wireline Workshop CC to date and recommends the use of this company's services.


My company, Exxaro, is a diversified South African based resources group. We occasionally require borehole logging, log data processing and log analysis services.

We have previously employed Wireline Workshop CC (Marcus Chatfield) for training on all aspects of mineral logging.

We have been entirely satisfied with the work performed by Wireline Workshop CC to date and recommend that the company is flexible and a high quality service provider.