Improving Gold Recovery
Learn about the ways the Quadra mining team is helping our clients solve challenges and improve business processes.
Lab Testing and Short-Term Plant TrialCOREM conducted lab tests to determine the effect of PAX on gold particles at various temperatures and to select a substitute collector. At <10℃, PAX formed stable multilayers (dixanthogen dimers) through physisorption which lowered the efficiency of dissolution, whereas novel methods in electrochemistry and spectroscopy showed that a Danafloat specialty collector did not. On-site tests/trials compared the flotation performance of PAX with that of the Danafloat specialty collector. At equal dosage, gold recoveries were on par, but iron recoveries were slightly in favor of PAX: iron monitoring makes it possible to check the efficiency of the flotation circuit as well as to limit the quantity of sulfides (acid generators) sent to the tailings pond. Further tests/trials on the flotation concentrate confirmed that Danafloat did not prevent cyanidation and that fluctuations in particle size distribution and mineralogy had no significant impact on the metallurgical performances.
Long-Term Plant TrialIn 2017, Quadra Chemicals' personnel worked closely with the metallurgical team to trial the Danafloat specialty collector. The dosage was adjusted progressively. The following graph shows its industrial validation: [caption id="attachment_39524" align="alignnone" width="800"] Figure 1: Gold Lost to Tailings from December 2014 to July 2017[/caption]
- Increased gold production by 800-900 oz/year (valued at CA $1.3-1.5M/year)
- Reduced health and safety risks associated with the preparation of PAX such as dust control
- Reduced environmental impact: fewer bags and boxes of PAX to destroy
- Easy handling: Danafloat's specialty collector is a liquid product which requires no preparation