Murchison’s 100%-owned Brabant Lake project is host to the Brabant-McKenzie Volcanogenic Massive Sulphide Deposit (VMS). The deposit presently contains zinc, copper, lead, silver, and gold resources of 2.1 million tonnes indicated and 7.6 million tonnes inferred and is open in all directions. The project area is considered highly prospective to host additional VMS-type mineralization as VMS deposits are seldomly formed in insolation – most are formed in clusters creating mining camps. Currently, the Brabant-McKenzie deposit is the only known significant VMS deposit in the area.
The Brabant Lake project, directly adjacent to the settlement of Brabant Lake, is located 175 kilometres northeast of La Ronge, Saskatchewan, along highway #102 with direct access to the power grid.
The project area consists of 627 square kilometres of mineral dispositions. The Company has flown 1,950-line kilometres of geophysical surveys since January 2019. More than 100 discreet electromagnetic geophysical anomalies have now been located. Extensive ground prospecting completed in 2019 and 2020, as well as exploration drilling in 2020 and 2021, has defined multiple high-potential exploration targets across the property.
Lawrence McKenzie, a trapper and prospector from nearby Stanley Mission, was the first person to discover mineralization at Brabant Lake in the 1950s. Since then, more than 48,000 metres of drilling have been completed on the property in successive waves of exploration. The vast majority of the total drilling completed on the project lies within the Brabant-McKenzie deposit with very little historic exploration drilling outside of the deposit.
Historic drilling on the project consisted of drilling in the 1950s by Bison Petroleum & Minerals Ltd., drilling in the early 1960s by Westore Mines Ltd., and drilling in the late 1960s by Rio Tinto Canada Exploration Ltd. The property was then acquired in 1988 by Gamsan Resources Ltd. that completed an additional 3,700 metres of drilling. Boart Longyear Canada then acquired the project in 1991 and optioned the property to Phelps Dodge Canada Ltd. in 1992 that then completed additional drilling at the deposit. In 2006, the property was purchased by Manicouagan Minerals Inc., the predecessor of Murchison Minerals.
In 2017 & 2018, Murchison completed extensive drilling on the Brabant-McKenzie deposit and these drill results were the basis for the updated 2018 NI 43-101 resource estimate. Murchison has most recently completed regional exploration drilling in 2020 and 2021 with successful discovery of zinc, copper and silver mineralization at its Betty and Main Lake targets.
Murchison completed extensive airborne electromagnetic surveys in 2019 and 2020 over a 57-kilometre-long strike length of favourable geology that has located approximately 100 electromagnetic geophysical anomalies. The airborne anomalies were ground-truthed by prospecting teams in the summer of 2019 and 2020 using “beep-mat” technology that successfully located multiple highly-prospective targets. Murchison’s highest-priority targets are described below.
This target was staked in the winter of 2021 after a crown reserve covering the area had lapsed. This target consists of the historic Betty Zone Showing that is located on strike and is approximately one km northeast of the Brabant-McKenzie deposit along the historic Sucker Lake winter road.
The target area was drilled in 1967 by Scurry-Rainbow that intersected 1.5 m of 5% lead and 0.6% copper in hole BETTY-3. In 1972 Canadian Nickel Company drilled four shallow holes in the Betty Area described intersecting chalcopyrite and sphalerite but the reported work lacks zinc assays with the best copper assay of 1.8 m of more than 1% copper. Two holes were drilled by Votarantim Metals Inc. in 2012, with one hole intersecting 0.3m of 3.85% zinc.
Murchison drilled two holes into the Betty Zone Showing in the winter of 2021 and intersected VMS- style massive-sulphide mineralization in both holes. The best assay was in hole BZ21-002, which intersected 4.40% zinc, 1.33% copper, 12.95 g/t silver from 280.73 to 281.65 metres (0.92 m), including 0.42 m at 3.76% zinc, 2.40% copper, 21.70 g/t silver and 0.12 g/t gold.
A borehole electromagnetic survey was conducted in the two recent 2021 drill holes at the conclusion of the 2021 winter drill program. The resulting data indicates that the holes narrowly missed a large conductive body located immediately down dip of the observed mineralization and is approximately 100 to 300 metres below surface. Initial modelling suggests the anomaly has a 700-metre strike length. This anomaly is considered highly prospective, and Murchison is eager to drill-test the target.
The Main Lake Target covers the Main Lake Showing and is located approximately ten kilometres southwest of the Brabant-McKenzie deposit and is interpreted to be along strike. The Main Lake Showing consists of a small, poorly-exposed outcrop of sphalerite- and chalcopyrite-rich massive sulphide at the base of a large cliff.
The showing was first located in 1957 and was drill tested by Westmore Mines Ltd. the same year with three holes that failed to intersect any notable economic mineralization. In 1964, four holes were drilled by Bison Petroleum and Metals Ltd. with one hole intersecting 3.2% Zn, 7.1 g/t Ag, 0.19 g/t Au, trace Cu and 0.1% Pb over 1.18 m. No other significant exploration work occurred on the target area until Murchison acquired the target in 2018.
Murchison relocated the surface mineralization in the summer of 2018 and extensively sampled the mineralization in the summer of 2019. A short, 0.89-metre backpack drill core in the face of the showing assayed 6.17% Cu, 8.31% Zn, 140 g/t Ag and 0.2 g/t Au.
Murchison drilled four holes in the Main Lake area in the winter of 2020 and intersected two intervals of zinc-copper-silver mineralization in the final hole ML-20-004, about 270 metres northeast of the surface mineralization. The upper interval was intersected over an interval of 3.59 metres (139.65-143.24) with 0.83% Cu, 0.61% Zn and 11.8 g/t Ag. The lower interval was intersected between 169.80 and 176.42 metres (6.62 metres) returning 0.09% Cu, 1.62% Zn and 41 g/t Ag over the entire interval including 1.02 metres at 5.08% Zn and 0.22 metres at 9.77% Zn. Extensive metamorphic VMS- type garnet-anthophyllite alteration was observed in all four holes and appears more extensive than what is observed at the Brabant-McKenzie deposit.
Murchison drilled three holes in the Main Lake Target in winter of 2021. Assays are pending.
Located 350 metres northwest of the northernmost tip of Street Lake, and 20 kilometres northeast of the Brabant-McKenzie deposit, the Street Lake Target consists of zinc mineralization discovered in 2020 and is proximal to a large EM conductor. The mineralization consists of a zone of extremely-weathered outcrop, where the rock has degraded almost entirely to rust-coloured silt and sand, assayed 0.58% Zn, 0.17% Pb and 32.4 g/t Ag. The weathering was primarily affecting the mineralized zone and it is assumed that the oxidation of the sample may have significantly decreased the original zinc content of the primary rock.
The area of deeply-weathered zinc mineralization that was observed is approximately 4 m2 in size within an approximately 8 m2 outcrop. Sampling adjacent to the weathered zone in a rusty feldspar-rich rock with disseminated galena and possible sericite alteration returned up to 0.38% Pb and 18.1 g/t Ag. An outcrop of rusty pegmatite was observed about 80 metres away and contained extensive quartz veining. Grab sampling of the pegmatite returned anomalous gold assays up to 0.38 g/t Au and 11.4 g/t Ag.
The area is considered highly prospective and requires extensive follow-up.
The Jones Lake Target is located on Murchison’s May Lake claims 32 kilometres north of the Brabant-McKenzie deposit. A short site visit in the summer of 2020 collected a grab sample that assayed 0.91% Zn, 0.12% Cu, 0.08% Ni, and 2.6 g/t Ag. The sample was collected on the shore of Jones Lake, which contains an historic zinc-rich lake sediment sample, that assayed 780 ppm zinc and, was collected by the Geologic Survey of Canada in the late 1970s.
The newly-discovered mineralization was found in shallowly-buried pyritic quartz-rich bedrock and was located utilizing GDD’s “beep-mat” technology. The subcropping zinc mineralization is an indication that the historic lake sediment zinc is locally sourced and signifies that the area is prospective for (VMS mineralization.
Geological investigation of the area revealed a volcanic stratigraphy that consists of basalts, andesites, rhyolites and tuffs. Similar volcanic rocks host the VMS deposits in the Flin Flon mining camp in Manitoba, many of which are strongly-associated to rhyolite bodies. The volcanic stratigraphy is important as it further indicates the area as having high potential to host copper-zinc mineralization.
Historic drilling completed in the area by Granges Exploration in 1974 indicated potential VMS-type chlorite alteration, and drilling in 1968 by Sherritt-Gordon intersected anomalous zinc mineralization. The holes drilled in 1974 by Granges Exploration appear to have correctly identified the volcanic stratigraphy and did note extensive chlorite and epidote alteration but had little sampling and assaying. The presence of sphalerite and VMS-style alteration is very encouraging. The historic holes are mostly shallow, and Granges Exploration likely did not adequately test the area. The area requires more electromagnetic (EM) coverage and additional prospecting.
Murchison considers the area highly prospective and plans to conduct additional prospecting and to cover the area with electromagnetic geophysical surveys in the future.
The Main West Showing is located approximately 700 metres west of the Main Lake Showing and consists of multiple lens of shallowly-buried massive-pyrrhotite mineralization with associated disseminated chalcopyrite. The showings were first located in the summer of 2019 by a Murchison prospecting team that followed-up on seven discrete but closely-spaced airborne electromagnetic anomalies detected in a 2018 airborne survey.
The sulphide mineralization was located using “beep mats” and exposed in nine shallow trenches. The trenches were sampled with a backpack drill with the highest assays returning 0.42% Cu over 1.7 metres and 0.69% Cu over 0.7 metres. VMS-type anthophyllite alteration was associated with the mineralization.
The surface mineralization was followed-up with three shallow holes drilled in the winter of 2020, all of which intersected massive pyrrhotite mineralization with disseminated chalcopyrite. The most notable assay was observed in hole MLW-20-001 that intersected 1.38 metres of 1.07% Cu and 0.18 g/t Au.
The presence of low-grade copper VMS-mineralization is considered encouraging and Murchison plans to explore along strike and depth for higher-grade mineralization.
The Brabant-McKenzie South Target consists of an area of mineralization discovered during prospecting in the summer of 2019. The mineralization is located 300 metres south along strike of the southern-most extent of the Brabant-McKenzie deposit. A rusty area of gahnite-bearing pegmatite was located and sampled and showed anomalous zinc mineralization. The samples were followed up with a 3.75-metre backpack drillhole that intersected 0.53 metres of pegmatite, then intersected sphalerite- rich semi-massive sulphide mineralization. The backpack drillhole DDHBM19-002 intersected 3.49% Zn and 10 g/t Ag over 3.75 metres.
The backpack drill hole was followed up with two drill holes in the winter of 2020. Hole BMS-20-002 intersected 0.95% Zn and 5.5 g/t Ag over 1.43 metres. The mineralization observed indicates that the mineralizing system that hosts the Brabant-McKenzie deposit continues further south and requires further work.
Geology and Mineralization
The Brabant-McKenzie deposit is associated with the Reindeer Zone of the Early Proterozoic Trans-Hudson Orogen, a collage of juvenile, arc-related crustal domains including La Ronge and Flin Flon. The property lies less than five kilometres east of the McLennan Lake tectonic zone separating the volcanic and intrusive rocks of the La Ronge domain from the amphibolite to granulite facies gneisses of the MacLean Lake belt. It straddles the boundary between the McLennan Group meta-arkoses and the MacLean Lake gneisses.
Property geology consists of biotite gneisses with semi-contiguous bands and intercalated amphibolite and calcsilicate gneisses of the McLennan Group covered by a thick blanket of sediments with limited outcrop. The Brabant-McKenzie deposit occurs within a northeast trending, northwest dipping homocline that may represent the eastern limb of an overturned synform.
Metamorphic VMS mineralization has been traced by drilling over a strike length of about one kilometre and widths ranging up to 18 metres. Pyrrhotite, sphalerite, pyrite, chalcopyrite, and galena occur within lenses of disseminated- to massive-sulphide, sulphide-rich breccias, and veins. Secondary minerals such as covellite, malachite, native copper and colloform pyrite occur within 50 metres of surface. There are two distinct mineralized zones: the Upper Mineralized Zone extending down dip to 1,000 metres and the Lower Mineralized Zone extending down dip to 800 metres.
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