The Suratt copper-molybdenum occurrence is located in the Southeast zone of the Lennac Lake property, approximately 14 kilometres southwest of Topley Landing and 2 kilometres northeast of Lennac Lake. Mineralization is localized along a north-south structure as disseminated and blebby chalcopyrite and molybdenite hosted in clay-silica altered porphyry intrusive rocks.
Regionally, the area is underlain by Lower Jurassic Hazelton Group (Telkwa Formation) volcanics composed of andesite, andesitic to rhyolitic tuff, breccia, minor argillite and conglomerate and dips gently northeast. The volcanics are intruded by northeast trending quartz plus feldspar plus biotite plus hornblende porphyry bodies of the granodioritic Late Cretaceous Bulkley Plutonic Suite. East of the property, Triassic Takla Group volcanics discordantly overlie the Hazelton Group. The Takla rocks are composed of chert, volcanic and sedimentary breccia, massive dacite to andesite flows and tuff. North of the property, Cretaceous sediments overlie the Hazelton Group. South of the property, the Hazelton Group is overlain by Tertiary Ootsa Lake and Endako groups volcanic rocks. Locally, copper and/or molybdenum mineralization is associated with a series of northeast trending dioritic to granodioritic biotite-hornblende-feldspar porphyritic dikes intruding maroon lapilli tuffs and volcaniclastic rocks of the Lower Jurassic Telkwa Formation. These dikes are typical of the Late Cretaceous Bulkley intrusions.
Sulphide mineralization, including disseminated pyrite, chalcopyrite and variable silver (tetrahedrite?), occurs within a bleached and silicified altered rhyolite breccia, up to 25 metres wide and trending northwest. The breccia is thought to have originally been dark green Hazelton volcanics and alteration and brecciation is thought to be correlated to a fault zone (Assessment Report 22181).
Mineralization has also been encountered in trenches up to 530 metres south of the showing (Assessment Report 32831), with chip samples returning grades of 25 to 1106 parts per million molybdenum and 127 to 1253 parts per million copper (Assessment Report 22181). Molybdenum and weak copper mineralization occur with a weak quartz stockwork within weathered pyritic volcanics.
In 1990 and 1991, L. Bourgh restaked the Lennac Lake property and it was optioned to Kennecott Exploration (Canada) Ltd. Kennecott completed geological mapping, prospecting and trenching and found additional copper showings on the east side of the property (the Southeast zone). The showing was originally found on an access road by prospector Pat Suratt. Chip samples yielded results ranging from 0.2 to 0.3 per cent copper. In 1993, Cominco Ltd. optioned the property and completed additional prospecting, soil geochemistry and trench sampling in the Southeast zone.
In September 2004, six two-post legacy claims were staked over the Southeast zone by D.G. MacIntyre and V.H. Parsons of Victoria. Additional claims to cover the original Thezar and Jacob showings were added on January 12, 2005 when electronic staking was inaugurated. In 2004, a broad orientation soil survey was completed at the Southeast zone to determine if soil sampling was an effective tool. In 2005, D.G. MacIntyre and V.H. Parsons conducted an approximately 600-metre-long soil survey with 50-metre sample intervals. Results indicated weak to moderate copper and molybdenum anomalies in samples taken above known mineralization (Assessment Report 27987).
Between August and October 2007, Dentonia Resources Inc. performed 639 metres of diamond drilling across nine shallow drillholes in the Southeast zone, each less than 100 metres deep. Results of this drilling indicated the presence of molybdenum, copper, gold and/or silver associated with fine grained sulphide mineralization through clay-altered volcanics and feldspar porphyritic dikes (Assessment Report 32831). The best results include greater than 0.1 per cent copper and 1 gram per tonne silver in clay-silica-altered lapilli tuff from the first 43 metres of drillhole LL07-1, as well as greater than 2000 parts per billion silver between 21 to 29 and 61 to 83 metres depth in drillhole LL07-3 (Assessment report 29459). In December 2007 and January 2008, Dentonia Resources Inc. performed 2650 metres of diamond drilling in nine drillholes in the Southeast zone. Dentonia then halted drilling and dropped its option on the property.
In 2011, D.G. MacIntyre and V.H. Parsons conducted one 500-metre-long soil sampling line with samples spaced at 50-metre intervals, extending east from the southernmost trench. Three samples returned positive results for copper and molybdenum based on statistical comparison to a 47-sample soil survey on the nearby East (093L 191) and West (093L 190) zones of the Lennac Lake property, performed by Amax Exploration Inc. (Assessment Report 32831).
In 2012, Riverside Resources (BC) Inc. conducted an airborne magnetometer survey that included the Lennac Lake property. Results showed subcircular doughnut-shaped magnetic anomalies roughly corresponding to suspected and known intrusive centres and copper mineralization on the property (Assessment Reports 33302, 33077F). In 2013, Riverside Resources (BC) Inc. completed smaller soil sampling grids at the Betty, Red Top, Cougar and Baboon Lake target areas with an orientation survey completed over the known porphyry mineral occurrences at the West, East and Southeast zones of Lennac. A total of 720 broadly-spaced Ah horizon samples were collected on the Flute and Lennac Properties. A total of 77 vertical percussion-drill holes totaling 1655 metres were drilled on the Flute, Lennac and Red Top targets (Assessment Report 34591).
In 2017, Rich River Exploration Ltd. completed a program of geochemical (tree bark, rock and soil) sampling on the Lennac Lake property. An angular float sample (LENR1702) of quartz breccia vein with a massive pyrite veinlet and sericite altered wall rock collected from a new access road to the east assayed 17.77 grams per tonne gold and 10,839 grams per tonne silver, while a sample (LEN1716) of volcanic breccia with malachite staining from a former trench assayed 0.233 per cent copper and 5.7 grams per tonne silver (Hutter, J.M. (2017-12-15): Technical Report - Lennac Lake Cu-Mo Mineral Property).
Refer to Lennac property occurrences: Thezar 81 (East) (093L 191), Thezar 75 (West) (093L 190), and Jacob (093L 243) for further information.
