Project Overview

This project involved the construction of a Tailings Storage Facility (TSF) and its associated works, which forms part of the Marampa Iron Ore Project in Sierra Leone. 

Under the Marampa Iron Ore Project, mining infrastructure was developed in order to expand and increase production of iron ore to 6.15Mwmt/a by 2014. The TSF is one of a number of infrastructure improvements required to achieve this target. 

The TSF provided an additional storage capacity of 28.5million cubic metres for tailings arising from the mining and processing operations. The works involved: 

  • Site clearance – 30Ha of bush and vegetation removal
  • Removal of topsoil, tailings and other unsuitable material from the footprint of the TSF
  • Construction of a starter embankment – 400,000m of fill
  • Supply and installation of drains to starter embankment – 6.7km of pipe installation
  • Supply and installation of a Decant Penstock - 700m of pipeline fully encased in reinforced concrete and the construction of a 315,000 litre capacity reinforced concrete penstock sump
  • Surface water management works
  • Supply and installation of 3.0km of HDPE slurry delivery pipeline
  • Construction of 3.2km of perimeter access road 

On all our projects in West Africa we have employed local people and provided training and development in a range of construction disciplines, to European standards. To support this training and development, Dawnus constructed a Training Academy at Marampa Mine, which supported a team of five trainers, and includes two classrooms and office space, along with a secure external training ground. Plant and equipment was allocated to the Academy for training. 

Trainees at the Academy were given employment at the mine, along with the resources and materials they will require to complete their training.

Project Gallery


London Mining PLC


Sierra Leone

Project Value


Contract Period

20 weeks