JDS Mining has been appointed to consolidate and complete a review of historical metallurgical work performed on the Elizabeth mineralized material and to outline potential options for future processing of the ore from the Project.
The Consolidated Metallurgical Review of () () (OTCMKTS: TMRFF) (FRA: 4W0) confirmed high gold recoveries in tests on two ore processing lanes of the Elizabeth section of the Blackdome-Elizabeth gold project in Colombia- British, Canada.
The review, which was performed by JDS Energy & Mining Inc, confirmed that mineralization is not a mess and that high recoveries can be expected from various processing routes.
Two treatment routes have been tested and have confirmed recoveries of up to approximately 95%:
- 94.7% recovery in gold bars by crushing, grinding, gravity separation and leaching; or
- 92.5 to 95.1% recovery in high grade gold concentrate using the same processing route as that used by the Blackdome gold mine plant (ie.
“Gives more confidence”
President and CEO Jason Bahnsen said, “The review work performed by JDS Mining builds confidence in the free grinding characteristics of Elizabeth’s ore and the value of our existing blackdome processing plant.
“As we continue to drill Elizabeth, we will simultaneously advance in the planning and engineering work that will lead to the completion of a scoping study and a preliminary economic assessment of the project following the publication of a first estimate of mineral resources belonging to Tempus. “
The review examined options for processing Elizabeth’s ore based on the results of a metallurgical testing program conducted by G&T Metallurgical Services Ltd in 2009-2010 at their laboratories in Kamloops, British Columbia.
The objective of G & T’s test work was to perform a preliminary metallurgical assessment of a sample from the Elizabeth Gold Project and to determine the suitability of two main treatment options, namely:
- Using a test process diagram with the same process steps as the existing Blackdome Gold Mine Mill (i.e. a simulation of using the Blackdome Mill to produce a high grade gold concentrate); and
- Examine the results of the stand-alone processing steps and run them through crushing, grinding, gravity separation, and then cyanide leaching to produce gold bars (i.e. a simulation of a typical carbon in leach / carbon in pulp circuit).
Composite samples received by G&T Met for their test work program were approximately 21 kilograms of south vein drill core (record at 3.95 g / t gold and 2.1 g / t silver) and approximately 37 kilograms of West Vein chip samples (assay at 0.49 g / t gold and 1.0 g / t silver).
However, it was determined that the analyzes received from the West Vein were too low grade and this was excluded from the testing program and used only for calibrations when preparing for testing for the South Vein composite.
JDS Mining recommended that further metallurgical and engineering study work be completed as part of an upcoming Preliminary Economic Assessment (PEA) of the project.
Recommended study work includes:
- A review of the costs of restarting the Blackdome plant;
- A trade-off study between the production of a flotation concentrate versus leaching and the production of a dore at the Blackdome plant or at the Elizabeth site;
- Elizabeth ore optical sorting test work completed;
- A trade-off study between the refurbishment of the Blackdome plant and the construction of a new facility in Elizabeth; and
- Track metallurgical test work to refine the optimal process map for Elizabeth.