A tunnel driven by Arequipa Resources (TSE) into a hillside at the Pierina gold project in north-central Peru has returned a consistent grade of 4.78 grams gold and 154 grams silver per tonne over a length of 80 metres.
The company is testing a zone of disseminated gold mineralization in preparation for drilling. The zone was defined by test-pitting, which outlined a contiguous surface area of 253,000 sq. metres averaging a bedrock grade of 6.6 grams gold.
Development of a second tunnel, 200 metres southeast of the first, is being slowed as a result of unstable ground conditions. This tunnel has returned an average grade of 3.83 grams gold and 178 grams silver over a 20-metre length, beginning at a depth of 6 metres.
Mineralization at Pierina occurs in a highly silicified and leached tuff and ignimbrite host rock of the Calipuy formation. The volcanics are underlain by limestones, quartzites and shales of the Mesozoic age.
Arequipa is upgrading an access road and preparing drill sites.
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