||South-central Yukon, 110 km NW of Carmacks; 40 km west of Capstone Mining Corp.'s high-grade Minto Mine
||100% by Northern Tiger
Sonora Gulch is located in the heart of the Yukon's Dawson Range - an underexplored part of the larger Tintina Gold Belt. Exploration at Sonora Gulch has outlined a 9 km2 gold-in-soil anomaly containing a large multi-centre porphyry system.
- Primary focus of 2011 drilling was the Gold Vein Zone - a 1.4 km by 500 m wide geochemical anomaly. 2011 drilling intercepted thick intervals of near surface, bulk tonnage mineralization, including:
- 0.42 g/t gold and 3.8 g/t silver over 94.0 metres
- 0.45 g/t gold and 3.0 g/t silver over 234.0 metres
- 0.44 g/t gold and 2.6 g/t silver over 110.0 metres
- Past drilling has intercepted high grade gold in three separate zones:
- AMADEUS ZONE: 15.3 metres of 6.2 g/t gold and 64 metres of 1.0 g/t gold
- NIGHTMUSIC ZONE: 26.6 metres of 5.0 g/t gold, 11.9 g/t silver and 0.23% copper
- GOLD VEIN ZONE: 6.0 metres of 7.6 g/t gold and 155.5 g/t silver
- A NI 43-101 Compliant Technical Report was completed in March 2011 by Watts, Griffis and McOuat Limited. A 16,400 metre drill program was recommended. Targets include both structurally or lithologically controlled gold-silver mineralization and bulk tonnage porphyry mineralization.
The gold trend at Sonora Gulch covers 9 square kilometres, and is defined by 1,971 soil samples. Gold-in-soil values range from trace to 2,340 ppb, with an average grade of 56 ppb. Within this broad trend, a number of clusters with significantly elevated gold values have been identified as high priority targets for additional exploration, including the Amadeus, Nightmusic and Gold Vein anomalies.
Also contained within the broad gold anomaly is a copper-molybdenum anomaly covering a 2 by 1-kilometre area, which is being evaluated as a copper-gold-molybdenum porphyry system. Copper-in-soil values range from trace to 1,870 ppm (443 samples with an average grade of 145 ppm) and molybdenum-in-soil values range from trace to 231 ppm (443 samples with an average grade of 11 ppm).
A deep penetrating Titan 24 Geophysical Survey completed by Quantec Geosciences Ltd. in June of 2010 highlighted numerous IP anomalies that are recommended for drill testing.
A number of features commonly considered to be indicative of porphyry systems are evident on the property, including:
- Age dating done by the Yukon Geological Survey indicate that granitoid intrusions at Sonora Gulch are similar in age to the large Casino porphyry located 40 kilometres to the west;
- Airborne radiometrics indicate a large zone of potassic alteration in close association with the geochemical anomaly;
- The copper-molybdenum anomaly is flanked by three gold zones: the Amadeus Zone to the east, the Nightmusic Zone to the Northwest and the Gold Vein Zone to the Southwest;
- Widespread gold and base metal skarns have been encountered on the north side of the geochemical anomaly (Nightmusic Zone);
- Epithermal gold-silver mineralization hosted within a zone of strong argillic and moderate phyllic alteration has been encountered immediately to the east of the geochemical anomaly (Amadeus Zone); and
- The geochemical anomaly is hosted in a quartz monzonite stock.