M.H. Lodewyk Pty. Ltd. are Surveying and Land Information Consultants based in Mount Isa. The firm was previously known as R.C. Todd and Associates and has been associated with development in Northern Australia since 1957.

The firm specialises in tenure, surveying and mapping requirements of the mining industry. The firm maintains a small practice at Mount Isa and roams afield on projects. The "in house" resources are small, with seven professional employees, however, through strong industry associations, joint ventures and judicious use of subcontractors, the firm has managed or been associated with substantial projects ranging from Mount Tom Price to OK Tedi. In 1991 the firm introduced a programme of quality assurance; complying with AS-ISO-9001-1994 and the Queensland State Government Purchasing Policy.

M.H. Lodewyk Pty. Ltd. provides advice and effects surveys relating to tenements and tenures in Queensland, the Northern Territory and Western Australia. The Surveyors are registered, licensed and approved under the relevant surveying, mining and petroleum acts. Up to date equipment includes geodetic and sub-metre GPS receivers, pulsed laser EDME, electronic total stations with data recorders, computer aided drafting and geographic information technology and the more traditional theodolites and levels. Expertise includes GPS applications, G.I.S. applications, route selection, engineering and construction, mapping and photogrammetry, environmental impact studies, statutory petroleum well locations, statutory underground mining surveys, bore hole surveys, geodetic control, surveys for geophysical exploration, land development and expert witness. The in house data base (archives) covers most development in North West Queensland over the past 30 years.