Auryn’s initial rock sampling program (2019) at the newly consolidated Curibaya project encountered high-grade silver and gold throughout a 1.5 kilometer by 3 kilometer quartz – sericite – pyrite alteration system. More than 20 samples were above 200 g/t silver and multiple results were over 1,500 g/t silver and up to 7.67 g/t gold. This program also demonstrated that the mineralization hosted within veins and stock work vein systems was more extensive than historical results suggested, as vein sets were sampled throughout the alteration system thereby confirming the high-grade nature of silver and gold mineralization.
Table 1: 2019 Rock sampling results
Significant Rock Sample Highlights 2019*
|Sample ID ||Ag g/t||Sample ID ||Ag g/t||Sample ID||Au g/t|
|* For 3 samples where OG62 results were greater or near 1500ppm Ag the assay were requested to be repeated with 30g nominal weight fire assay with gravimetric finish (Ag-GRA21), results pending. |
The mineralization encountered throughout the quartz – sericite – pyrite alteration system has shown strong average grades of silver and gold over 640 rock samples. Combining both historical and current sampling, the alteration system is averaging 72.9 g/t silver and 0.19 g/t gold. The high average grades, observed in both silver and gold over the 4.5 km² alteration system, demonstrate the strength and potential endowment of the mineralized system. At this early stage, Auryn’s technical team believes there are both precious metal intermediate sulphidation epithermal and copper porphyry targets.
Auryn’s very first exploration efforts at Curibaya consisted of a cyanide leach stream sediment survey that identified a cluster of gold & copper anomalies in contiguous drainage basins within the SW portion of the claim block spanning an area of approximately 50 square kilometres. These anomalies were the first stage of developing Cu/Au porphyry and Au epithermal targets.
Mineralization within the Sambalay and Salvador concessions is hosted within the Toquepala volcanic sequence and the Gramadal limestone. Specifically, there are three defined zones of mineralization on the acquired concessions: Aqua del Milagro, Mina Tapial and Sambalay Chico. The Aqua del Milagro and Mina Tapial zones cover an area of 2 km by 1 km and 900 meters by 100 meters, respectively. They are both interpreted to represent a potential intermediate sulphidation system due to the presence of high-grade gold and silver samples, strong silica clay alteration and associated silica vein stockworks. Auryn’s technical team believes that the observed intermediate sulphidation style of mineralization provides an exploration target analogous to Buenaventura’s San Gabriel deposit (1.4 million gold ounces at 5.7 g/t measured and indicated and 0.8 million gold ounces at 4.6 g/t inferred)1.
Samples from the Aqua del Milagro zone contain a high gold-silver content, with values up to 14,180 g/t silver and 23.6 g/t gold. Samples from the Minas Tapial epithermal veins contain both high-grade gold-silver as well as copper, with values up to 15.1 g/t gold, 2,780 g/t silver and 13.5% copper.
The third defined zone of mineralization, Sambalay Chico, is situated along an east – west trending structural corridor parallel to the Incapuiqo regional fault. The high-grade copper mineralization extends over an 800-meter strike length and is hosted in three parallel breccia bodies that are between 1.5 meters and 8 meters in thickness. Samples from the breccia bodies have copper values up 10.85% and strongly demonstrate the potential for copper porphyry mineralization at depth.
Table 1: Historical rock samples from the Sambalay and Salvador concessions
Historical Rock Samples
|Agua del Milagro||Mina Tapial||Sambalay Chico|
|Au (g/t)||Ag (g/t)||Cu (%)||Au (g/t)||Ag (g/t)||Cu (%)||Au (g/t)||Ag (g/t)||Cu (%)|