About TMM Group

Based in Brisbane and the Bowen Basin, TMM Group’s core business activities involve the provision of civil construction and operations and maintenance services to the Queensland Coal Mining Industry.

With the acquisition of Windsor Earthmoving Contractors in 2013, we have grown to become a business that:

  • $60M group revenue FY2016
  • Owns and operates approximately 80 items of plant and equipment
  • Employs approximately 250 people

Our business model allows us to be competitive on both small and large projects.

Complementing our core services, and differentiating us from many of our competitors we can also provide:

  • Civil engineering and design services
  • Mine planning and design services
  • Coal mine statutory services

Our commitment to quality, health and safety, and the environment is paramount and is reflected in our key company policies:

We enable our clients to deliver cost effective and successful projects and enhance the performance of existing operations.

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Dave Mason


Dave is a qualified Civil Engineer with a Master of Business Administration. Having spent 15 years working with local governments in regional Queensland, Dave has extensive experience with approval, design and delivery of major infrastructure projects. Over the last 10 years he has delivered various greenfield and brownfield infrastructure developments within the resources industry. Dave is also a Registered Engineer of Queensland (RPEQ).

Carl O'Hehir

Chief Executive Officer

Carl is a qualified Mining Engineer with over 15 years’ experience in the mining industry. Having spent most of this time in the Bowen Basin, he has also held successful management positions in Africa. During this time he has gained skills in technical, operational and commercial roles that provide him the ability to understand the entire process. He has worked for both owner-operators and contractors in various managerial roles, and was recently part of the establishment team on a greenfield site in Central Queensland. Carl is also a qualified SSE.

John Harper

General Manager - Operations

John has 10 years’ experience as an engineer. While he has mainly worked within mining, John also has experience as a civil and environmental engineer. John has held numerous positions on large open cut coal mines in Central Queensland, which has allowed him to be exposed to various aspects of mining, including drill and blast engineering, dragline design, truck and shovel design, mid and long term planning. John has been responsible for the delivery of many large civil projects including haul road construction, dam upgrades, and repairs and mine drainage systems.