Ghana – Golden Star Resources, the Ghana-focused gold mining company, announced last week that it is contemplating the early closure of its Bogoso refractory operation following the failure of a ball mill motor at the processing operation.
The ball mill motor at its Bogoso refractory plant failed last week as a result of frequent voltage fluctuations in the grid power supply to its Bogoso mining and processing operations over the last three months.
A replacement motor for the ball mill is being refurbished and is expected to be on site next week, the company said.
Most of the ore on the Bogoso concession is deemed refractory, and is accordingly treated using BIOX bio-oxidation gold refractory technology. However, in line with Golden Star strategy of transforming to a low cost non-refractory gold producer, the refractory mining and processing operations at Bogoso are due to be closed in the fourth quarter of 2015.
Golden Star said that in light of the downtime at the plant as a result of the ball mill failure and the resultant impact on bacterial activity and gold recovery in the BIOX circuit and the resulting impact of such throughput issues on the cost structure “compels management to review its options at Bogoso and an early closure of the refractory operations is being contemplated”.
The company expects that this will have a negative impact on production and costs for the full year and said that it will provide further guidance on the operation after this review.