Prieska Mine Definitive Feasibility

Location & Client

Prieska, Northern Cape, South Africa
Orion Minerals

Mining Method

Undergound various methods.

Study Accuracy

DFS (+5% -15%) Longitudinal and
transverse LHOS, DAF and Low profile
DAF

Mine Plan Design

Introduction

ABGM have been closely involved in the Prieska Underground Copper Mine feasibility study for Orion Minerals. The intention is to progress the project to implementation and execution.

The historical flooded mine shows potential for re-opening and ABGM was asked with the mining engineering and life of mine (LOM)
planning of the underground Copper/Zinc reserve.

The Project’s base-case underground plan during the Foundation Phase is to de-water and refurbish the shaft, establish new underground infrastructure and start mining the hypogene orebody. The target rate for the underground
production of 200ktpm RoM material.

Challenge

The orebody is severely un-uniform in terms of geometry and width, therefore making the planning of extraction quite challenging as various mining methods require to be designed and scheduled within the mineable reserve with different costs.

Solution

ABGM in conjunction with the Orion mining team developed a detailed and feasible, from a practical and economical point of view, mine design and production schedule.

The orebody was defined and demarcated/split into four zones and each zone was designed according to its selected mining method. The designs were combined and practically aligned to facilitate production scheduling. The selection of the mining methods was determined by ABGM, based upon the local width and dip of the orebody.

After several re-iterations, a practical and achievable schedule, as per the requirements of the study, was produced which showed positive NPV results.