Base and precious metals producer
Metallurgical testwork carried out by Consep and Core Resources has demonstrated the viability of treating Bakers Creek Waste Dump material through the existing
Red River plans to restart gold production at Hillgrove in 2020 using infrastructure to take advantage of current high gold price. Work has commenced on a conceptual flowsheet, and Red River will keep the market updated on progress.
Red River Managing Director
The potential quantity and grade of the Exploration Target is conceptual in nature and therefore is an approximation. There has been insufficient exploration to estimate a Mineral Resource and it is uncertain if further exploration will result in the estimation of a Mineral Resource. The Exploration Target has been prepared and reported in accordance with the 2012 edition of the JORC Code.
Metallurgical testwork was carried out by Consep (gravity concentrate) and Core Resources (flotation concentrate and cyanide leach tests) on representative samples derived from a 423kg bulk sample taken from the Bakers Creek Waste Dump in 2019 by Red River (refer to ASX release 'Sampling confirms the gold potential at
Consep Gravity Concentrate Testwork
Consep tested Bakers Creek Waste Dump samples using its extended gravity recoverable gold (GRG) test procedure and found samples to contain a high GRG content of 81.1%. The GRG is predominately classed as Coarse. The remaining 18.9% of the gold may be considered non-GRG, which is infeasible to recovery by gravity methods.
Modelling of a suitable gravity circuit by Consep indicates that 60-65% of the gold in the Bakers Creek Waste Dump would be recovered by gravity methods to a gravity gold concentrate. It is estimated that in excess of 95% of the contained gold in the gravity gold concentrate will be recovered by cyanide leaching to gold dore on site.
Gravity Recoverable Gold (GRG) is the portion of gold in an ore that can be feasibly recovered by gravity concentration. Remaining gold, or non-gravity recoverable gold, is the portion which is too fine or inadequately liberated at the finest viable grind size to be recovered by gravity concentration. The GRG value of the ore is expressed as the percentage of the total gold that is recovered by the standardized GRG test. This testing method is widely endorsed in the global gold mining industry.
Core Resources Flotation Concentrate Testwork
Core Resources' flotation testwork on the Bakers Creek Waste Dump samples generated a gold recovery of 83.9% to a flotation gold concentrate. This concentrate then underwent gold cyanide leaching tests which indicated a gold recovery of 85%.
Conceptual Flowsheet
Highly positive metallurgical testwork outcomes from the Bakers Creek Waste Dump enabled Red River to focus on a conceptual flowsheet to maximise the gold recovery using existing plant and infrastructure on site.
Using existing infrastructure, it will load and truck material from Bakers Creek Waste Dump 4.2km to the
The remaining material produced from the grinding circuit will then be treated through the existing flotation circuit to produce a flotation concentrate. Based on the testwork results, Red River estimates that a further 20-25% of gold contained in the feed material will report to the flotation concentrate. Total gold recovery to the combined gravity and flotation concentrates is estimated to be about 80-90%.
The gravity gold concentrate and flotation gold concentrate will then be leached on site using cyanide to produce saleable gold dore. The total gold recovery (of gold contained in the feed material) to a saleable gold dore is estimated to be 75-80% of the contained gold in the Bakers Creek Waste Dump feed material. The current gravity circuit in the
Bakers Creek Waste Dump Historical Sampling Review
The Bakers Creek Waste Dump was created during the mining of the
About
RVR is seeking to build a multi-asset operating business focused on base and precious metals with the objective of delivering prosperity through lean and clever resource development. RVR's foundation asset is the Thalanga Base Metal Operation in
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