Red River Resources Ltd’s (ASX:RVR) bulk sampling of the Bakers Creek waste rock dump within the Hillgrove Antimony Project in New South Wales has returned a weighted average gold grade of 3 g/t.
The company has started metallurgical test work on the Bakers Creek samples, engaging Consep Pty Ltd to carry out gravity test work with Core Resources to carry out flotation and cyanide leach test work.
This program will seek to confirm historical metallurgical test work results, which indicated potential gold recovery of up to 75% with flotation and up to 93% with cyanidation.
The metallurgical test work program is expected to be completed this quarter.
Data generated from the metallurgical test work program will then be used to confirm the suitability of the current Hillgrove plant, leach circuit and gold room to treat gold-bearing material from the Bakers Creek Waste Dump.
This waste dump was created during the mining of the Bakers Creek Mine, which produced 303,900 ounces of gold from 175,980 tonnes of ore at approximately 49 g/t gold during operation from 1877 to 1921.
Ore was hand sorted underground and again on surface with the dump containing material rejected during surface hand sorting.
The dump is around 105 metres by 70 metres and 15-20 metres deep.
Historical metallurgical test work carried out on samples from the Bakers Creek waste rock dump with amalgamation (grinding followed by mixing with mercury) recovered 33.3% of gold, while flotation recovered 75.4% of gold to a concentrate grading more than 150 g/t gold.
Cyanidation recovered 93% of gold.