Tarkwa, in Ghana's Western Region, is one of the country's established gold mining areas. Mining and processing operations in the area depend on a stable power supply for equipment used across the mine and processing facilities.
The power system at the Tarkwa mine is much larger than a single generator project. Public technical information shows an average mine demand of around 38–44 MW, with power supplied mainly by an on-site gas power plant and the grid serving as an additional source. Emergency power generation systems are also installed at strategic locations to supply essential and critical machinery when the main power supply is unavailable.
For this type of environment, a 600kW diesel generator is better considered as a standby unit for selected loads rather than a power source for the whole mine. This is a practical application of backup power in gold mining, especially for equipment that needs to remain available during a power interruption.
The proposed system uses a 600kW diesel generator powered by a Weichai engine. The Weichai generator can be connected to a defined group of essential loads according to the site's electrical design and standby power requirements.
The system is equipped with an automatic transfer switch. During normal operation, the selected equipment remains connected to the main power supply. If the normal supply fails or falls outside the configured limits, the automatic transfer switch detects the abnormal condition and sends a start signal to the Weichai generator.
Once the generator reaches the required operating condition, the automatic transfer switch transfers the designated loads to the generator. When the normal supply returns, the system can transfer the loads back to the main supply and allow the generator to stop after its normal cooling period.
This setup gives the 600kW diesel generator a clear role: it is there when the normal power source is unavailable, rather than running continuously during normal mining operations.
For a gold mining facility, the actual standby loads depend on the electrical distribution system and the customer's priorities. A 600kW unit may be allocated to selected auxiliary equipment rather than the entire processing plant.
Possible loads can include water pumps, selected conveyor equipment, lighting, control panels, communication systems and other essential auxiliary equipment. The exact combination should be confirmed through the customer's load list, motor starting requirements and electrical design.
This approach is particularly relevant to backup power applications because the generator capacity is matched to the loads that actually need to remain available. It also avoids the unrealistic assumption that a 600kW unit can replace the main power system of a large mining operation.
In a gold mining environment, some equipment may need a fast response when the normal supply is interrupted. Manual generator operation would require an operator to identify the power failure, start the generator and then complete the transfer procedure.
With an automatic transfer switch, these steps can be coordinated automatically. The ATS monitors the normal power supply, starts the Weichai generator when a configured power failure occurs, and transfers the selected loads once the generator is ready.
For a 600kW diesel generator, this is a straightforward way to make the unit part of the site's standby power arrangement. The generator does not need to carry every load in the mine; it can focus on the equipment identified as essential by the customer.
The Tarkwa mining area already has a complex power infrastructure, including on-site generation, grid connections and emergency generation for critical equipment. Therefore, a Weichai generator in this type of project should be positioned as an additional backup power unit for a specific group of loads.
A 600kW diesel generator with an automatic transfer switch provides a relatively simple arrangement for maintaining selected electrical loads when the normal supply is interrupted. Before delivery, the final configuration should be based on the customer's voltage, frequency, load capacity, motor starting characteristics and ATS requirements.
For mining customers in Ghana and other African markets, this kind of backup power configuration is more practical than simply specifying a large generator without considering which equipment actually needs emergency power.
