The Tide (36 zone) occurrence is located near the top of an east facing slope at an elevation of approximately 1700 metres and approximately 2.1 kilometres west of the Bowser River.
The area is underlain by andesitic ash tuffs and interbedded flows of the Early Jurassic Unuk River, Hazelton Group. Pervasive silicification is the dominant form of alteration, locally accompanied by weak pervasive chlorite. A major northwest trending fault divides the north and south of the area putting mineralized ash tuffs and plagioclase-phyric flows to the north in contact with unmineralized coarse grained lithic wackes and mudstones to the south.
Seven styles of sulphide mineralization have been observed within the 36 Zone and include:
1. Planar parallel pyrite ± arsenopyrite ± pyrrhotite ± quartz fractures and veins. Fractures are typically 1 millimetre in width but range up to 5 millimetres and occur at 30 to 50 degrees to the core axis. Fracture density varies from less than 10 per metre to 38 per metre, increasing when hosted in fine-grained volcanic lithologies (ash tuffs). Associated alteration types include moderate to intense sericite and carbonate alteration (bleaching) and possibly chlorite replacement (?). The fracture set correlates with the steeply dipping prominent 070 degrees trending fracture set on surface and is thought to be the main host to Au mineralization within the 36 Zone.
2. Quartz + chlorite + pyrite ± pyrrhotite ± trace chalcopyrite ± ankerite shear veins. Veins are typically 5 to 35 millimetres wide and occur at 20 to 30 degrees to the core axis. These veins may correlate with steeply dipping and roughly north-south trending veins observed on surface.
3. Quartz + pyrrhotite ± chlorite veins which range from 1 to 25 millimetres in thickness and occur at shallow to moderate angles to the core axis. These veins may be a variation of the No. 2 style above.
4. Irregular, low angle (les than 10 degrees) quartz + chlorite + ankerite ± pyrite ± pyrrhotite veins up to 20 millimetres in width.
5. Fine- to coarse-grained pyrite and pyrrhotite as disseminations and on hairline fractures. Likely representative of different events with pyrrhotite perhaps being later (?).
6. Patchy and irregular pyrrhotite associated with chlorite, sericite, and carbonate replacement styles of alteration.
7. Quartz + pyrrhotite + pyrite + sphalerite ± galena ± tennantite veins which very from 5 to 60 centimetres in width and are emplaced within fault zones.
Significant bulk tonnage gold potential is reported to exist at the 36 zone where drilling by Kiska Resource (formerly Rimfire) in 2004 and 2005 successfully intersected broad intervals of low grade gold mineralization in several drillholes including 129.4 metres of 1.0 gram per tonne gold and including 39.6 metres of 1.92 gram per tonne gold (www.kiskametals.com/s/Tide.asp). Drilling to date has been confined to a 250 by 750 metre area within the 600 by 3500 metre Crest soil anomaly, characterized by a greater than 500 parts per billion gold and arsenic-in-talus-fines values, in which the 36 Zone is located. Previous drilling programs to test the 36 Zone yielded wide gold intersections in five of eight holes including long intersections (207 and 174 metres) averaging approximately 0.5 gram per tonne gold (www.kiskametals.com/s/Tide.asp).
Work History
During 1993 through 1995, Hemlo Gold Mines Inc. conducted programs of prospecting, geological mapping and soil and rock sampling. The 36 zone was discovered in 1995 with samples yielding up to 5.62 grams per tonne gold over 7.1 metres (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
In 1996, Hemlo Gold Mines completed a program of rock and soil sampling on the 36 zone, Southpit (104B 253) and Northpit (104B 252) occurrences with generally low results except at the 36 zone with 18 samples yielding greater than 1.0 gram per tonne gold over an area of approximately 150 by 230 metres (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
In 2004, Serengeti Resources Inc. drilled one hole on the 36 zone. Mineralization in the 2004 hole (TIDE04-03) was confirmed to occur as arsenopyrite-pyrite+/-quartz veinlets and parallel arsenopyrite-pyrite joint fillings over the entire length of the hole. The grade averaged 0.89 grams per tonne gold over its 168.25 metre length, including 1.00 gram per tonne gold over 129.4 metres (Assessment Report 27590).
In 2005, Serengeti drilled four holes in the bulk-tonnage 36 zone extending gold mineralization along strike in both directions and to depth. Diamond drilling yielded up to 0.45 and 0.56 gram per tonne gold over 209.11 and 210.93 metres in holes TIDE05-07 and -08, while a surface sample (279357) yielded 5.1 grams per tonne gold and 55.8 grams per tonne silver over 0.15 metre (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).
In 2006, channel and rock samples were collected from five target zones of altered and mineralized outcrops, with the focus on the 36 and Northpit (104B 252) zones. A channel sample (B391420) yielded 2.13 grams per tonne gold over 3.50 metres (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).
In 2007, diamond drilling yielded intercepts up to 0.488 gram per tonne gold over 206.64 metres, including 1.84 grams per tonne gold over 14.10 metres in hole TIDE07-13 (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).
See Tide (104B 120) for a description of the Tide property History.