Zacatecas Silver Corp Announces Metallurgical Tests at PanucoBy Lorenzo Núñez | Tue, 06/15/2021 - 16:39
Zacatecas Silver Corp announced they have received positive preliminary metallurgical test results for their Panuco project, from SGS Minerals at Lakefield (“SGS”).
Panuco is part of the Zacatecas Silver property located in Zacatecas, Mexico, in the highly prospective Fresnillo Silver Belt, which has produced over 6.2 billion ounces of silver. The company holds 7826 ha (19,338 acres) of ground that is highly prospective for low and intermediate sulphidation silver-base metal mineralization and potentially low sulphidation gold-dominant mineralization.
The work conducted by SGS was a first-pass bench-scale scoping study based on a small bulk sample of historical drill core. It is the first metallurgical test-work completed at the Panuco project and the robust gold, silver, lead and zinc are 90 percent recovery achievable.
The metallurgical test work supports both bulk flotation flow-path and sequential flotation flow-path, with the bulk floatation flow-path producing a single gold, silver, lead and zinc rougher concentrate (15 minutes of floatation and 23 percent mass pull) with 697 g/t silver, 0.97 g/t gold, 1.67 percent zinc and 0.58 percent lead and recovering 96.2 percent of the silver, 93.6 percent of the gold, 96.5 percent of the zinc and 92.1 percent of the lead.
On the sequential flotation flow-path of the test, even though the material at Panuco has a combined lead and zinc grade of less than one percent, intermediate sulphidation systems that exist in the Zacatecas region are often silver and base metal-rich. For this reason, a sequential flotation flow-path was applied to the master bulk sample to produce lead, zinc and pyrite concentrates.
The lead-silver concentrate graded 2,420 g/t Ag, 2.55 percent lead and 1.19 percent Zn that recovered 71.9 percent of the silver and 87.5 percent of the lead. A zinc-silver concentrate grading 2.19 percent Zn and 190 g/t Ag was produced that recovered 82 percent of zinc, while a pyrite concentrate graded 0.73 g/t Au and 57 g/t Ag and recovered 47.8 percent of the gold and an additional 6.5 percent of the silver.
“The rougher flotation recoveries are extremely encouraging especially given they have been achieved using historical core. It is anticipated that optimization work using fresh core will further enhance metallurgical performance. Mineralization at Panuco is silver-rich but base metal-poor (less than one percent combined lead and zinc), as such, producing a silver-gold ore is ideal rather than separate zinc and lead concentrates,” said Dr. Chris Wilson, Zacatecas Silver Chief Operating Officer and Director.
The fact that over 96 percent of the silver and almost 94 percent of the gold has presented to the rougher concentrate, suggest that regrinding of the rougher concentrate and tank leaching with cyanide, is likely to be a highly viable processing option. This flow path would generate silver-gold,” continued Wilson.