Orinoco Gold has completed the previously announced modification works to the processing plant at the Cascavel gold mine, located in the State of Goiás in central Brazil.
The company processed a 500t trial parcel of low-grade ore in order to evaluate the impacts of the modifications.
Work under modification programme included the replacement of screen deck panels with smaller aperture panels, as well as the fabrication and installation of a sluice box.
The modification process also reduced gaps in the primary and secondary crusher jaws.
The panels on both the upper and lower screen decks were replaced with smaller aperture panels to produce a finer product with an improved particle size distribution (PSD) to the gravity recovery circuit, in accordance with suggestions made by the company’s metallurgical consultant Mining Plus.
Orinoco noted that the modifications were undertaken in order to decrease the tail grade via a combination of reducing the PSD being fed to the gravity circuit and capturing gold from the tailings stream.
Orinoco Gold CEO Craig Dawson said: “Both modifications have delivered the desired outcome and resulted in an overall reduction in the tail grade, and hence improved recovery, from the process plant.
“Further improvements are anticipated as the operating parameters of the plant are modified once processing operations recommence in earnest later this quarter.”