Horizon Minerals (ASX:HRZ) said the workstreams for the prefeasibility study at the Black Swan gold project in Western Australia are progressing, with delivery of the combined study on track for completion in the December quarter, according to a Wednesday Australian bourse filing.

GR Engineering Services (ASX:GNG), which is conducting the study, is in the final stages of completing the prefeasibility study. The refurbishment of the existing comminution circuit and the introduction of a new gold carbon-in-leach processing facility at the Black Swan process plant. The plant is designed for a throughput of 1.5 million tonnes per annum.

GR Engineering Services completed a trade-off study and identified a preferred comminution circuit involving single-stage crushing. Process flow diagrams, mechanical equipment, as well as electrical load lists, single line diagrams, and various other components for the carbon-in-leach beneficiation component of the study have been completed.

Its shares rose 2% in recent trading.