The contractor, based in Castlederg, pleaded guilty to three breaches of health and safety regulations at Omagh Crown Court.
The case arose from an incident on a construction site at Cookstown on 26 July 2010 when a dumper, being used to transfer soil and clay across the site, tipped over an embankment.
The investigation found that during one of the transfers, a large boulder was being moved. The operator approached the tipping area and started to tip the boulder over the embankment when the dumper went over the edge and overturned.
An 18-year-old dumper operator, who had only started working with the company the previous week, was trapped under the steering wheel and suffered numerous fractures to his pelvis.
The investigation also revealed that the injured party had not received adequate training to operate the dumper and that the company had failed to provide a proper method to ensure safe tipping of materials.
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