Nickel-copper-cobalt sulphide mineralization was discovered at Gochager Lake, located in the La Ronge meta-volcanic belt, in the mid-1960s with subsequent exploration carried out mainly by the Scurry-Rainbow Oil Company Limited. Exploration activities included soil sampling, trenching of gossans, geophysical surveys and diamond drilling. A total of 85 mostly vertical drill holes (total of 27,400 m) delineated the mineralized Gochager A-Zone (or Main Zone) with a strike length of 330 meters, widths of up to 120 meters, and depths of up to 305 meters. The Gochager A-Zone mineralization consists of disseminated mm-cm size blebs of sulphide, net-textured sulphide and, in places, semi-massive to massive sulphide pods.
Examination of the available geological and geophysical data, plus first-hand experience on the property by a senior Ni-Cu-PGE consultant, indicates the property has some very positive exploration attributes not previously recognized. These include:
The semi-massive and massive sulphide concentrations in the Gochager mineralized zone have in part extremely high Ni/Cu ratios (>10), and Pd/Ir ratios (6-11). No other Ni-Cu sulphide projects in Saskatchewan fall into this metal ratio range. These metal ratios are only found in nickel ores from Komatiitic geological terranes like that of the world class Thompson Nickel Belt and the Australian Kambalda nickel mining camp. Since 1980, it has been speculated that komatiitic nickel sulphide mineralization and potential ores should exist in the central La Ronge meta-volcanic belt because of the recognition of komatiite lavas in the belt.
Research has clearly demonstrated that the komatiitic composition of the massive sulphides in the Gochager Lake project are not compatible with the host rock and rock forming mineral compositions that the sulphides reside in. This suggests that these high grade Ni-Cu-Co sulphides were introduced through an interconnected mineralized plumbing system that was tapping into a much more primitive mineralized komatiitic system at depth or proximal to the main project. This is further corroborated by discoveries in the Gochager Lake area of discrete high grade massive Ni-Cu-Co sulphides in the surrounding country rock. These sulphides are devoid of any mafic or ultramafic rock material like that hosting the Gochager Lake project.
The Gochager Lake area and deposit sit on the boundary between the Rottenstone Domain and the La Ronge Domain. It is well known that structural boundaries between two major geological terranes are an excellent geological environment for the formation of world-class Ni-Cu deposits, with Voisey’s Bay Ni-Cu camp being the most recent example of this.
The area is extensively covered with glacial debris and muskeg so surface geological prospecting should not reveal any new gossans or outcrop showings, as was the case in the early exploration of the 1960’s. However, a 2,284 km deep penetrating state of the art airborne electromagnetic and magnetic survey (VTEM) was flown in June 2008 and identified numerous potential targets those have yet to be investigated.
Harrison Cookenboo, Ph.D., P.Geo., is a qualified person as defined in National Instrument 43-101. He has reviewed and is responsible for the technical information presented in this news release.
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