Mansourah-Massarah Gold Project

Thickened Tailings Transport and Distribution


Larsen & Tourbo


Saudi Arabia


2019 - Current

Middle East

The Mansourah-Massarah Gold Project is an open-pit mine located in the Central Arabian Gold Region of the Kingdom of Saudi Arabia, approximately 200km southeast of Riyadh. The project was started by Ma’aden Gold and Base Metals (MGBM), the largest mining company in Saudi Arabia, with an expected 250,000 ounces of gold per year over an estimated mine life of 12 years.

In 2019, MGBM awarded the Engineering, Procurement, and Construction (EPC) contract of the project to a consortium of Finnish technology company Outotec and Indian engineering and construction company Larsen & Toubro. Larsen & Toubro assigned ATC Williams to aid in the designing of the tailings and water management system of the project.

— Features and solutions

Under this assignment, ATC Williams undertook numerous tasks:

  • Reviewing previous studies
  • Conducting laboratory tests
  • Designing the tailings management system
  • Designing the water management system
  • Conducting various related assessments

The tailings are thickened using a paste thickener, and the thickened tailings are pumped to the Tailings Storage Facility via a 1.5km long steel pipeline. Central Tailings Discharge (CTD) scheme is used for the tailings distribution to the storage facility via a tailings distribution tank.

ATC Williams used an in-house developed hydraulic assessment method for non-Newtonian fluids to size the tailings pipeline and verify the pump duties.

The entire tailings pipeline is designed using Victaulic-type couplings, minimising site welding. It saves construction time and helps compensate for the thermal expansions of the pipeline.


  • Hydraulic Design and Pipe selection optimisation using in-house developed non-Newtonian hydraulic assessment methods.
  • Pipe Stress Analysis to ASME B31.4 code using Bentley AutoPIPE® software
  • Using Victaulic type couplings in the tailings pipeline to minimise site welding to save construction time
  • Using FEM methods to design the Tailings Distribution Tank for Central Thickened Tailings (CTD)
  • Williams conducted pipe stress analysis for the whole tailings pipeline, following ASME B31.4 (Pipeline Transportation Systems for Liquids and Slurries) code, using Bentley AutoPIPE® software.
  • CFD modelling techniques and analysis used to optimise the design of the Distribution Tank.

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