Soils, Concrete, Asphalt, and Materials Testing Iron Duke Mine Railway We were engaged as consultants on this project to build a new 31 km railway line to the new BHP crushing plant at Iron Duke. As well as carrying out site investigation for the new plant, we were engaged to use our expertise to simplify construction of the railway line, which was essentially a "cut and fill" project. We sampled the critical terrain areas and classified all soils and materials. We constructed a trial embankment using typical soils, and determined the most efficient method of building support roads and embankments. We also developed special compaction techniques for the railbed, and devised simple control testing procedures for the contractor to carry out on site. The entire project was completed in a 12-month timeframe due to the on-site techniques increasing efficiency and allowing the contractor to proceed with certainty.