The Tide South (Southpit) occurrence is located at an elevation of approximately 1580 metres on a south east trending ridge, approximately 2.0 kilometres west of the Bowser River.
The area is composed of ash tuffs with lesser dust and lapilli tuffs and interbedded augite porphyry of the Lower Jurassic Unuk River Formation, Hazelton Group. A north trending extension of Lower Jurassic Summit Lake Stock hornblende granodiorite intrudes the volcanics. This intrusive lobe is from 300 to 500 metres wide and separates andesitic volcanics to the west from dacitic volcanics to the east (Open File 1987-22).
The Southpit occurrence is located approximately 1 kilometre to the west of the granodiorite intrusive in an area of andesitic volcanics. The Southpit Zone comprises several gossans within an area of 100 x 500 metres. Outcrop exposure is good, and the entire zone is above tree line. The Southpit Zone is marked by a strong gold-silver-arsenic-copper-lead antimony soil geochemical anomaly. Two distinctive styles of mineralization are present in the Southpit Zone. The first includes quartz-arsenopyrite veining within chloritic shear zones trending 030-070 and dipping moderately to steeply to the southeast. This style is more prevalent in the northern parts of the Southpit zone. The second consists of 1 to 30-centimetre wide quartz-galena-sphalerite-tetrahedrite veins, generally striking 010 to 030 degrees and dipping steeply to the east. These two styles may represent an area in which there is overlap between 36 zone (104B 399) style mineralization and 52 zone (104B4 01) style mineralization. The dominant style of mineralization at the core of the Southpit zone is tetrahedrite-bearing quartz veins. These veins are hosted in northeast-trending ankeritic shear zones, which overprint and truncate 36 zone style of mineralization.
Shear-hosted gold associated with fracture-controlled pyrite-arsenopyrite veinlets and disseminations is reported within a few hundred metres to the northeast of the Tide South (Southpit) at the Undertow and Murillo zones (Assessment Report 24190).
In 1983, the highest assay obtained from this zone was 115.89 grams per tonne gold and 192.69 grams per tonne silver. The type of sample material analyzed was not reported. Several other samples taken over a large area contained much lower but significant amounts of gold and silver (Assessment Report 11528).
In 2001, a sample (276392) assayed 19.93 grams per tonne gold, 48.4 grams per tonne silver and 0.195 per cent copper over 0.50 metre, while other samples yielded up to 4.19 grams per tonne gold, 172 grams per tonne silver, 0.526 per cent copper, 9.51 per cent lead, 1.48 per cent zinc and greater than 1.00 per cent antimony (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
In 2004, one hole was drilled by Serengeti Resources Inc. test the grade and form of the mineralized vein system exposed in the trenches at the Southpit zone at depth. The lithologies encountered were mostly andesitic to dacitic(?) flows, tuffs, and volcaniclastics, however the most intense alteration and mineralization was associated with small bleached quartz+/-feldspar porphyries. Dominant alteration types include silicification and Fe-carbonate with subordinate Fe-oxide, chlorite, and late calcite.
The same style of mineralization and alteration found on surface at the Southpit zone was intersected from 19.20 to 59.91 metres. The best mineralization observed was intersected from 30.55 to 44.50 metre and consists of pyrite+/-arsenopyrite on both planar and irregular fractures and in thin veins. Arsenopyrite also occurs as fine- to very fine-grained acicular disseminations, typically at trace to minor levels throughout, however several short (<10 cm) intervals with semi-massive arsenopyrite+/-pyrite were noted. Arsenopyrite mineralization is rare below 44.25 m. The best result was from 49.44 to 50.25 meters which yielded a gold value of 1.91 grams per tonne over 0.81 metre (Assessment Report 27590). Results were not considered encouraging.
A surface chip sample (273942), performed in 2004, yielded up to 4.57 grams per tonne gold and 17.2 grams per tonne silver over 2.00 metres, while grab samples yielded up to 8.79 grams per tonne gold, 173 grams per tone silver, 1.90 per cent copper, 7.10 per cent lead, 8.55 per cent zinc and greater than 1.00 per cent antimony (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
In 2005, a sample (275705) assayed 10.70 grams per tonne gold, 93 grams per tonne silver and 0.493 per cent copper, while chip samples (275701, 275702 and 275704) yielded from 1.47 to 4.81 grams per tonne gold with 6.0 to 32.0 grams per tonne silver over 0.30 to 1.80 metres (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
Work History
In 1981, a trench was blasted in the Southpit zone, exposing three quartz-sulphide veins (Assessment Report 9687). Further sampling was performed in 1983.
Work on the Southpit zone between and 1981 and 2004 is described in Tide (104B 129).
Diamond drilling in 2004 targeted the Southpit and further sampling was done in 2005 and 2006.