Mine Overview

Ghana Manganese Company Ltd (GMC) is the only manganese producer and exporter in Ghana.  The company is a privately-owned mining company (consolidated Minerals Africa Limited -90% and Government of Ghana-10% free carried) that holds a mining concession for manganese over an area of 170 square kilometers in and around Nsuta in the Western Region of Ghana, less than 3% of which has been mined to date.

Nsuta is known for its unique high-grade carbonate ore, which is considered to have one of the highest manganese-to-iron ratio ores in the market (Mn: Fe ~31) and is low in phosphorous, alumina, and other heavy metal impurities, making it well-suited for both alloy and manganese metal production.

As an experienced owner-operator with a strong focus on operational excellence and innovation, the company targets to be at the bottom of the cost curve of global manganese producers. It has 3 existing pits in total (Pits A, B, and C) with operations currently active in Pit C.  

Our Production Process

The method of ore extraction is exclusively open-cast, comprising drilling, blasting, loading, and hauling.

Dry crushing and classification of the carbonate ore into fines, logs, and lumps; by virtue of primary and secondary crushing and screening, is undertaken at the carbonate crushing plant. These fines or lumps are stockpiled according to grade and size. The processed ore is then transported to Takoradi Port by road and/or rail.

In 2019, the total tonnes of manganese ore mined was 5.38M @ 26.9%Mn and waste of 64.25M tonnes.

Drilling

Drilling is performed using Atlas Copco Pantera DP1500i with bit diameters 127mm or 115mm depending on ground conditions. On average 120 holes are drilled per blast daily at a depth of 10m and sub drill of an average of 1.3m depending on meters required to meet bottom elevation. Usually, a drilling plan is designed to guide the drillers which will contain information such as the drill patterns, drill depth, sub drill, rock information, and location to be drilled.

Blasting

Blasting activity is carried out almost every day on the GMC mine site. The Non-Electric Detonator (Nonel) explosives are used for blasting activities, these explosives are stored in a magazine northwest of the open pit and supplied during the charging time. An explosives magazine houses all detonators and primers which are contained within an area secured by a fence. The magazine is bullet-proof, fire-resistant, and well-ventilated.

An explosive truck supplies emulsion from outside the mine for blasting activities in the interim, GMC is working round the clock for its emulsion provider to mount a unit onsite to enhance the turnaround time of explosive supply.

Loading

Primary loading equipment is a combination of 100t and 150t diesel-hydraulic backhoe CAT and Komatsu excavators. The loading capacity ensures manganese ore; in-pit backfill capabilities and extra stripping capacity to provide continuous availability of exposed manganese or are achieved.

Processing and Haulage

Primary hauling equipment consists of 100 t and 150t Komatsu and CAT haul trucks. All manganese ore is hauled to the primary crusher located at the exit of the pit rim where the ore is stockpiled at a rompad. The waste rocks are transported to the CN dump.

 

 

Shipment

Manganese ore from the rompad stockpile is processed (crushed and screened with no chemical addition) and stockpiled into different categories of sizes for transportation by rail and road to Takoradi Port. The manganese ore is then loaded aboard OVGs and predominantly exported to its client in China and Ukraine, as well as some other smaller off-takers.

Closure Strategy

To deliver on our commitments, we establish closure plans for all our active mining areas before we begin operations. These plans display the steps to be taken throughout the mine life to deliver an effective and sound end to operations, including rehabilitation of the surrounding area and protection of water resources. These plans are regularly updated, and a proportion of the mine’s annual budget is set aside to make sure all closure obligations are met.

Nsuta Mine Process Flow Chart (Mine - Market)

processes chart