Tietto Minerals Ltd's (ASX:TIE) independent metallurgical test-work on samples from Abujar Gold Project in Côte d’lvoire demonstrate highly favourable characteristics for low‐cost processing, including free milling, high gold recovery, low energy and low reagent consumption.
The positive results from tests on representative samples from Abujar‐Gludehi (AG) deposit of the 2.2-million-ounce Abujar project have confirmed its strong economic potential.
These will now allow the company to commence the Abujar pre‐feasibility study for which Mintrex, a reputable engineering consultant, has been engaged to manage metallurgy and plant design.
Tests completed on samples from AG, which hosts the project’s high‐grade core of 19.3 million tonnes at 2.2 g/t for 1.38 million ounces, returned:
- Free-milling ores – delivering up to 98-99% overall gold recoveries;
- High gold recovery at coarse grind sizes ranging from 96% to 98% for fresh ore;
- Notable low energy and low reagent requirements; and
- A simple flow sheet – single-stage crusher with SAG mill circuit (SSAG) along with gravity and CIL for gold recovery.
Program delivers "quadrella"
Managing director Caigen Wang said: “The completion of the metallurgical program has delivered us a quadrella – free-milling at coarse grind sizes, very high-quality gravity and CIL gold recoveries, low energy and low reagent consumption as well as a simple flowsheet.
“Mintrex and ALS have done a great job delivering the results of the study in a timely manner, despite the imposition of COVID-19 hygiene requirements and as such, we are on a great footing to move seamlessly into the PFS phase of work.”
The PFS is targeted for completion in the first quarter of 2021.
Samples were divided into nine composites on the basis of their ore type and their proximity.
The physical properties of the Abujar ores allow Tietto to consider a lower-cost, simple flowsheet utilising single-stage crushing with SAG mill circuit given the high gold recoveries obtained at coarser grind sizes and excellent physical test work results.
Gravity amalgamation test work established ‘significant’ gravity gold in almost all composites.
The samples were quite ‘spotty’, having particles of free gold throughout, meaning the grade of the composites were variable.
This led to the addition of a gravity recovery step, which was added before each leach optimisation test.
Resource update on-track
Wang continued: “Drilling continues at Abujar and we remain on schedule for delivery of an updated resource in Q3, 2020.
“This updated mineral resource and results from the metallurgical test-work program will underpin our PFS, which is scheduled for delivery in Q1, 2021.”
The company expects to report further drilling results in the coming weeks.