The North area is underlain by the Early Jurassic Groat stock which intrudes Upper Triassic Stuhini Group fine-grained clastic and pelagic sedimentary rocks consisting of bedded sandstone, siliceous siltstone, chert and graphitic chert. Volcanic siltstone, sandstone and conglomerate overlie these siliceous sediments to the north. To the south are coarse andesite and basalt derived conglomerates. The country rocks are cut by several coarsely augite-phyric mafic sills which, in turn, are cut by Groat dikes. The Groat stock is a faulted, northeast trending, coarse-grained porphyritic to fine-grained equigranular intrusion with granodiorite to quartz monzonite modal compositions. A Uranium-Lead age date of 205.1 plus/minus 8 Ma was determined by R.M. Friedman of the University of British Columbia (Fieldwork 1996, page 295).

According to 2011 Assessment Report 33085, the GJ/Kinaskan Lake property hosts three principal styles of mineralization: a) The porphyry copper-gold mineralization related to 205 MA aged quartz deficient intrusive rocks similar to the Groat stock. b) Disseminated pyrite ± chalcopyrite mineralization with copper-gold values associated with silicification related to 180 MA aged granite/felsite dikes. c) Dolomite quartz vein/fault-controlled pyrite-chalcopyrite-arsenopyrite ± sphalerite ± galena with gold and silver values. This occurs along north-south structures possibly related to mid-Jurassic rifting. The most significant of the three styles of porphyry style mineralization is disseminated, fracture quartz vein and quartz stockwork controlled pyrite with variable chalcopyrite, rare bornite and trace molybdenite mineralization containing elevated gold values which have been identified in the North (104B 180), GJ (104B 034) and Donnelly zones (104B 086). Host rocks for copper-gold mineralization in all zones include intrusive and sedimentary rocks of which wackes and monzodiorite are the most significant. It is unclear, which unit, if any is the principal mineralizing phase, however mineralization is closely associated with steeply dipping fractured, brecciated intervals that are related to east-west to east northeast by west southwest striking faults.

In 1971, a drill hole (AM-71-10) is reported to have yielded 0.182 per cent copper over 30.48 metres (Mehner, D.T., Giroux, G.H., Peatfield, G.R. (2007-04-30): Technical Report on the GJ Copper-Gold Porphyry Project).

In 2003, Canadian Gold Hunter examined the North showing as part of its Kinaskan/GJ Property. They collected two hundred seventy-six soil samples from the North grid and surrounding area. Also in 2003, five trenches totaling 332.5 meters in the general area of the North Zone showing in Groat Creek were excavated by hand to expose copper mineralization. Diamond drill testing of these anomalies began in 2004 when 10 holes were drilled.

In 2004, drill holes encountered strong alteration associated with hydrothermal brecciation and pyrite veining, but chalcopyrite was generally confined to a 200 metre by 200 metre zone centered on the North showing where the best intercept is 81.6 metres grading 0.292 per cent copper, 0.223 gram per tonne gold and 2.38 grams per tonne silver in hole CGH-04-007 (http://www.canadiangoldhunter.com). Coincident I.P., ground magnetic and bedrock copper-gold geochemical anomalies continue eastward from hole 7 for 1200 metres.

In 2005, five widely spaced holes on the North zone, totalling 1013.44 metres, intercepted classic alkalic porphyry style copper mineralization and alteration were observed in the North zone and include sericite replacement of plagioclase feldspars, chloritization followed by leaching of most hornblendes and primary biotite, localized epidote veining accompanied by minor quartz veining (weak stockwork) with localized, minor k-spar envelopes, widespread disseminated and fracture pyrite with lesser and variable chalcopyrite and minor (trace) bornite all cut by calcite-filled fractures, often exhibiting a sheeted pattern. Drilling yielded intercepts of up to 0.156 per cent copper, 0.126 gram per tonne gold and 4.0 grams per tonne silver over 21.34 metres in hole CGH-05-057 (Giroux, G.H., Peatfield, G.R., Cathro, M.S. (2016-02-24): Technical Report on the Donnelly-GJ Deposit Area, GJ Property). This work extended the known altered and mineralized zone to an area of 200 metres by 470 metres.

Refer to Donnelly (104G 086) and GJ (104G 034) for related detail and common work history.