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Yauricocha mine: latest drilling reveals high grade poly-metallic ore

Published by , Assistant Editor
Global Mining Review,

Sierra Metals Inc.(Sierra Metals) has reported drilling results demonstrating high grade polymetallic ore and a new mineralisation style of Hydrothermal Breccias located at the Contacto Oriental Zone extension situated within the Central Mine at Yauricocha in Peru.

To date, four holes have been executed from the 1070 level of the Yauricocha Mine in the Contacto Oriental Area. These holes have intercepted polymetallic sulfide mineralisation containing high-grade zinc and copper zones over significant widths.

According to Sierra, these results demonstrate the potential for high grade mineralisation within the reported area, and more importantly indicate the continued existence of extensive mineralisation at depth.  These results come as part of an ongoing brownfield drilling programme testing priority targets at the Yauricocha Mine, which is located 150 km east-southeast of Lima in the Yauricocha Mining District (Cordillera Occidental), Peru.

President and CEO of Sierra Metals, Igor Gonzales, commented: “Today’s results represents further the further potential at the Yauricocha Mine with the identification of high-grade polymetallic mineralisation at the Contacto Oriental zone.  It also suggests the possibility of even further mineralisation at depth, specifically from the zinc sulfide orebodies which contain significant widths.”  

He continued: “The Central Mine area contains several high-grade mineralised areas opening the possibility for further discoveries of additional orebodies along the Yauricocha fault. The company made a strong commitment to brownfield exploration as part of its growth plan, and results such as the ones released today continue to demonstrate that this investment is paying off with the potential to further grow our mineral resources, and add high value tonnage”.

Vice President of Exploration at Sierra Metals, Alonso Lujan, added: “The location of the new discovery is outside of the Yauricocha Fault contact zone, which is important as it confirms the exploration upside of zones previously unexplored. Prior exploration efforts at Yauricocha were mainly focused on the Yauricocha contact zone.” 

He continued: “the results reported today from the Contacto Oriental zone demonstrate the existence of high-grade, sulfide mineralised sectors containing mainly copper and zinc […]. Generally hydrothermal breccias are large structures and the discovery of a new style of mineralisation represents a new opportunity to further increase resources.”

All reported intercepts are core length as further drilling is required to determine true thicknesses.

Quality Control

According to the Canadian metals producer, all samples were dried, crushed and pulverised by the Chumpe Lab at site, pulp samples were shipped by ALS Peru S.A. Lab Chemex) to their laboratory in Lima, Peru.

The quality assurance-quality control (QA-QC) programme employed by Sierra Metals has been described in detail in the NI-43-101 report for Yauricocha dated 9 December 2016, prepared by SRK Consulting in Denver, which is available for review on Sedar. Standards and blanks are inserted into the sample stream and duplicate samples are sent to the ALS Peru S.A. lab (Chemex) in Lima as per internal quality control procedures. 


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