RE: Grades29 Jun 2025 15:38
And on top of that they've been doing all this too......
METALLURGICAL SAMPLING
The drill core from drilling by Rockfire during 2023 and 2024 has recently been sampled for collection of core for use in metallurgical test work. A total of 100 samples for a combined weight of 128.4kg of core has been collected and will be sent to Wardell Armstrong International, part of SLR Consulting for comminution and metallurgical test work. Samples collected include high grade (73.4kg), low grade (25.85kg) and waste rock (29.15kg), which will be used to complete the following components.
· Crushing Work Index (CWI) to determine the type and number of crushers which will be required to adequately crush the ore from underground for feed into the grinding circuit
· Grinding Work Index (GWI) to determine the type of grinding and power consumption to grind the ore to a size suitable for feed into the flotation circuit
· Unconfined Compressive Strength (UCS) tests to determine the strength of the rocks surrounding the ore to ensure the surrounding ground maintains a safe environment once an underground void is created from the extraction of the mineralised ore
· Point Load (PL) tests which are like UCS tests but rely on a reduced surface area of load. This measures the rock strength prior to failure and is used to ensure a safe underground working environment
· Ore sorting test work. This work is important to determine the suitability of the ore to various optical, laser and physical separation techniques prior to the grinding stage. Methods of separation may include colour, magnetism, specific gravity, particle sizing and reflectivity. The outcomes of this test work may minimise the throughput of waste material and increase the overall grade of material to be fed into the flotation circuit
· Flotation test work, which will utilise a locked (closed) system and will determine recoveries using multiple passes though the flotation circuit
· Rockfire is being advised by Wardell Armstrong, part of SLR Consulting on test work which is required for the recovery of germanium as a valuable by-product of the anticipated zinc production.