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Wednesday, November 24 - morning
SIDEX is 20 Years Old! and Geoscientific Knowledge Acquisition Work at the MERN
Session not offered with simultaneous interpretation.
During this session, MERN geologists will unveil preliminary results of the geoscientific knowledge acquisition work carried out in the summer of 2021. At the same time, analytical data and prospective zones for mineral exploration resulting from this work will be made available to clients through SIGÉOM. Preliminary geological bulletins from the Ungava (Amarurtuuq and Spartan Lake), James Bay (Conviac Lake and Le Vilin Lake), Abitibi (La Trêve Lake) and Grenville (Île-du-Grand-Calumet and Dolbeau-Blondelas) rock surveys will be published. New geochemical data from lake bottom sediments in the Mistassini-Ouest area will also be explained. The second part of the session will be devoted to the presentation of the final results of the Geological Bulletin for the Girardville area in the Grenville Province, as well as geophysical surveys published in 2020-2021.
SIDEX, an Institutional Fund that Supports Mining Exploration in Quebec, is Celebrating its 20th Anniversary!
SIDEX, created in 2001 by the Fonds de solidarité FTQ and the Government of Québec, is celebrating its 20th anniversary this year! This investment fund continues its mission to support mineral exploration throughout Quebec by financing companies active in the territory. Its niche remains basic exploration up to the mineral resource estimation stage. The fund, which began operations with $50 million in 2001, has grown significantly in value through active portfolio management over its 20 years of operation. SIDEX has invested more than $105 million in the capital stock of 150 junior mining exploration companies, enabling work to be carried out on approximately 285 exploration projects. The fund is currently worth close to $80 million after $26 million in rebates to its two sponsors.
Over the years, SIDEX has participated in exploration waves for diamonds, nickel, uranium, critical and strategic minerals, in addition to gold and base metals. Its mission has several components, including diversifying the substances sought and the areas explored, as well as supporting the next generation of entrepreneurs and innovation. By continuing to finance this fundamental stage of the mining cycle, i.e. mineral exploration, SIDEX's ultimate goal is to discover the mines of tomorrow that will ensure the sustainability of the Québec mining industry. The fund has had many successes, including the financing of the Mesamax (nickel in Nunavik), Bracemac-McLeod (zinc-copper in Matagami) and, most recently, the promising Patwon gold deposit in the Eeyou Istchee James Bay region.
SIDEX has been able to provide financing through the ups and downs of mining cycles. Moreover, the fund has adapted over time to the needs of companies by establishing targeted programmes.
What does the next 20 years hold? SIDEX intends to continue its mission and adjust to the changing ecosystem. The challenges and opportunities we see are to promote diversification, support the next generation, encourage exploration in frontier regions by promoting the use of innovation and respecting environmental, social and governance issues.
Celebrating Five Years of a Successful Digital Adventure!
Authors: Mehdi A. Guemache and François Leclerc(MERN)
In a particular health context, this year we are celebrating the 5th anniversary of the digital shift undertaken by Géologie Québec for the publication of geoscientific data. Indeed, 2016 saw the publication of the very first stratigraphic units and the first Bulletin géologiQUE as web pages. The transition to Internet publishing has continued and other digital products have been added over the years: structural units, geochemistry tables, geochronology records, quaternary bulletins, quaternary glossary records, mineral substances portal and "Geology for All" posters.
Geology of the Conviac Lake Area, Eeyou Istchee James Bay
Authors: Daniel Bandyayera, William Chartier-Montreuil, Myriam Côté-Roberge and Maxym-Karl Hamel-Hébert (MERN)
A survey conducted during the summer of 2021 led to the production of a new 1:50 000 scale geological map of the Conviac Lake area (NTS sheets 33B02 and 33B07) located on the Eastmain River, approximately 100 km NE of Nemiscau. This work has allowed defining the boundary between the Opinaca and La Grande subprovinces in this area. The Middle and Lower Eastmain Greenstone Belt (MLEGB), which belongs to the La Grande Subprovince, has been extended eastward for about 10 km. This entity includes the Natel Formation, consisting of banded amphibolite of basaltic origin and felsic to intermediate tuff, as well as nodular paragneiss and iron formations of the Auclair Formation. A new transitional unit of bedded, poorly metamorphosed paragneiss associated with the La Grande Subprovince, the Prosper Formation, occupies the southernmost part of the map. Intrusive packages belonging to the Village Batholith and the Béryl Nord and Béryl Sud plutons cut volcanic and sedimentary rocks of the La Grande Subprovince. Variably migmatized paragneiss of the Laguiche Complex (Opinaca Subprovince) occupy the NE part of the area. They are cut by felsic to intermediate intrusive rocks of the Bezier Suite near the contact with the La Grande Subprovince. This piling is cut by several shear zones roughly oriented E-W, including the NE extension of the Rivière Rupert Shear Zone (ZCRR). The presence of dome and basin structures and a series of isoclinal folds characterize the tectonics of the area. Preliminary work has highlighted five prospective areas for different types of mineralization: 1) gold mineralization associated with iron formations; 2) polymetallic mineralization associated with volcanogenic alteration; and 3) mineralization associated with pegmatitic granite.
Geology of the Le Vilin Lake Area, Eeyou Istchee James Bay
Authors: Daniel Bandyayera, Emmanuel Caron-Côté and Charles St-Hilaire (MERN)
The geological survey of the Le Vilin Lake area (NTS sheets 32O10 and 32O15), carried out during the summer of 2021, covers an area located approximately 285 km NW of Chibougamau. The northern part of the mapped area exposes locally migmatized metasedimentary rocks constituting a transitional unit between the La Grande and Opinaca subprovinces. It contains significant intrusions of white muscovite ± garnet pegmatitic granite. To the NW, this package overlies tonalitic gneiss of the Champion Complex. In the centre, the contact zone between the La Grande and Opatica subprovinces is bounded to the north and south by the Rivière Rupert and Poste Albanel shear zones respectively. The zone is characterized by the presence of kilometric units of amphibolitized basalt, iron formation, quartzite, metasedimentary rocks, as well as mafic and ultramafic volcanic rocks and intrusions. These units form an E-W strip over 30 km long, interpreted as the eastward extension of the Lac des Montagnes belt. The southern part of the area belongs to the Opatica Subprovince and consists of a package of tonalitic gneiss, tonalite, granodiorite, porphyritic granodiorite and granite assigned to the Théodat Complex. The central and southern parts of sheet 32O10 are largely occupied by intrusions of intermediate composition (monzonite, quartz monzonite, monzodiorite and quartz monzodiorite) containing enclaves of tonalitic gneiss. Archean rocks of the area are cut by different families of diabase dykes oriented NW-SE and NE-SW. In the northern half of the area, La Grande rocks display diffuse and relatively homogeneous deformation characterized by the presence of a generally steeply dipping penetrative foliation oriented E-W to NE-SW. Further south, in the Opatica Subprovince, units close to the contact with the La Grande Subprovince are characterized by shallow dips, suggesting south-to-north thrusting.
This work indicates that the La Grande-Opatica contact is an important regional metallotect. Prospective zones for gold and Ni-Cu-PGE mineralization have been identified. A showing (O'Connor) and Zn-Pb-Cu-Ag anomalies associated with volcanic rocks, as well as gold anomalies related to iron formations or shear zones are reported in the assessment work and have been visited and sampled. The area is also known for its lithium potential associated with white spodumene pegmatitic granite.
Geology of the La Trêve Lake Area, Abitibi Subprovince, Eeyou Istchee James Bay
Authors: Mélanie Beaudette and Yannick Daoudene (MERN)
A new preliminary geological map of the La Trève Lake area (sheets 32G13-NE and 32J04-SE) was produced following a survey conducted during the summer of 2021. This work clarifies the boundary between the Abitibi and Opatica subprovinces and refines the stratigraphy and structure of this area. The stratigraphic sequence begins with the Roy Group, which consists mainly of pillow and massive basalts of the Obatogamau and Bruneau formations, as well as gabbro sills. The top of this unit is marked by intermediate to felsic volcanic rocks related to the Blondeau Formation. This volcanic unit is overlain by sedimentary rocks of the Opémisca Group formed at the base of the La Trève Formation consisting of interstratified polymictic conglomerate and sandstone. Above, the Daubrée Formation consists of sandstone, arenite, wacke and mudstone beds. The majority of polarities measured in the volcanic and sedimentary sequence indicate stratigraphic peaks towards the SE. More or less circular, kilometric syenite and granite plutons, little or not deformed, cut the sequence. While rocks generally underwent greenschist facies metamorphism, they display amphibolite facies mineralogical assemblages and even signs of partial melting at the edge of these plutons. Decametric gabbro and gabbronorite dykes oriented NE-SW cut all the units described above. The survey also identified several prospective geological environments from a metallogenic point of view: 1) volcaniclastic rocks of the Blondeau Formation prospective for base and precious metals associated with VMS; 2) the Abitibi Dyke gabbronorite prospective for magmatic Ni-(PGE) mineralization; 3) the polyphase gabbro intrusion of the Mildred Stock prospective for magmatic Ni-Cu-(PGE) mineralization; and 4) syenitic intrusions of the Daine and Saussure stocks prospective for REE mineralization.
Geology of the Dolbeau-Blondelas Area, Grenville Province, Saguenay-Lac-Saint-Jean Region
Authors: Mhamed El Bourki and Abdelali Moukhsil (MERN)
A new geological survey was conducted in the summer of 2021 in the Île-du-Grand-Calumet area (eastern half of NTS sheet 31F10), located approximately 90 km NW of the city of Gatineau. The objective of the project was to acquire new geological knowledge in this part of the Grenville Province known for its potential for zinc and critical and strategic minerals. A preliminary geological map at scale 1:20 000 was produced by integrating the results of mapping and exploration work carried out in the area over the past 100 years. This work has also allowed defining some new geological units, recognizing the potential for new substances and improving the knowledge of already-known areas of interest. The western part of the mapped area includes metasedimentary units historically attributed to the "Grenville Supergroup". This group consists mainly of calcitic marble, dolomitic marble and, in lesser amounts, calcosilicate rock, paragneiss, quartzite and amphibolite. Most of Grand Calumet Island is formed of metabasalt (1232 Ma) intruded by small mafic to felsic intrusions. These mafic rocks host the former New Calumet polymetallic mine known for its zinc mineralization, a substance whose potential was later developed in the neighbouring metasedimentary units. Amphibolite appears to be associated with a mafic intrusive suite outcropping in the Bryson village area, which may correspond to the Chenaux Gabbro (1231 Ma) mapped in Ontario and known for its Fe-Ti-V potential. The eastern part of the map consists mainly of banded plutonic units of intermediate to felsic composition. This area also contains zones intruded by dykes of intermediate syenite and potassic felsic rocks that have rare earth potential.
New Lake Bottom Sediment Geochemical Data from the Mistassini-Ouest Area, Eeyou Istchee James Bay
Author: Fabien Solgadi (MERN)
In 2020, the Ministère de l'Énergie et des Ressources naturelles changed the strategy used for lake bottom sediment surveys. The sampling grid was increased from one sample per 6 km2 to one sample per 1.5 km2.
The first of these high density lake bottom sediment surveys was conducted in the summer of 2020 in the Mistassini-Ouest area (parts of NTS sheets 32J09, 32J16, 32L12, 32L13, 32O01 and 32P04), located in the Opatica Subprovince of the Superior Province. This area is located SE of the Frotet-Evans belt, which is known for its mineral potential, notably the presence of the old Troilus gold mine. The survey, carried out by Geo Data Solutions (GDS), covered an area of approximately 2900 km2 and resulted in the acquisition of 1963 samples. Results were used to create maps of raw values interpolated by the natural neighbour method for features considered to be of economic interest. These maps reveal prospective zones for several substances.
Inventory of Aggregate Resources in the Saguenay - Lac-Saint-Jean Region
Author: André Brazeau (MERN)
The inventory of aggregate resources in the Saguenay-Lac-Saint-Jean region (NTS sheets 22D05, 22D06, 22D07, 22D10, 22D11, 22D12, 22D13, 22D14, 32A08, 32A09, 32D10, 32A15, 32A16) was carried out during the summers of 2019 and 2020. In the study area, deposits likely to provide sand and gravel are mainly of marine (littoral and deltaic) and fluvioglacial origin. These deposits generally form terraces and are mainly concentrated in the lowlands of the Saguenay-Lac-Saint-Jean region and in the valleys of the region's main rivers (Ashuapmushuan, Mistassini, Péribonka, Shipshaw, Valin and Chicoutimi rivers). The thickness of deposits varies on average from 3 m to 5 m, but exceeds 10 m in many places. The area's sand and gravel reserves are significant. Several deposits are already in operation or have been exploited in the past. Aggregates in the area are derived from Precambrian rocks of the Laurentian Plateau (Grenville Province; granite, gneiss, gabbro, diorite, syenite, anorthosite) and, to a lesser extent, from Paleozoic sedimentary rocks of the St. Lawrence Platform (limestone, shale). Coarse aggregates consist mainly of fragments of the above-mentioned rocks, while fine aggregates are granitic sands. During fieldwork, 417 mining sites and 92 observation sites were visited. Of these, 153 sites were active at the time of our visit. Many of the sites (212) were abandoned, while the remainder had been redeveloped or used up. During these visits, 78 samples were taken for analysis to determine the physical-mechanical characteristics of the aggregates. The results of these analyses determined that the quality of the materials in the region is generally very good. These materials can be used in many road and infrastructure works.
Geology of the Girardville Area, Grenville Province, Saguenay-Lac-Saint-Jean Region
Authors: Mhamed El Bourki and Abdelali Moukhsil (MERN)
A new 1:50 000 scale geological map of the Girardville area (NTS sheet 32H02) in the Saguenay-Lac-Saint-Jean region was produced following a survey conducted in the summer of 2020. Rocks mapped are mainly Mesoproterozoic in age (1.45-0.99 Ga). Several units recognized in the Normandin area (sheet 32A15) continue northward into the Girardville area. These are the Barrois Complex (metasedimentary rocks, <1224 ±18 Ma), the Allegrin Plutonic Suite (undated), the Saint-Thomas-Didyme Suite (1042 ±2 Ma), the Sainte-Hedwidge Intrusive Suite (1017 ±36 Ma) and the Claire Gabbronorite (undated). New lithodemic units have been mapped as part of this project, namely the Bois Vert and La Vertu plutonic suites, the Coin Batholith and the Bolduc and Jean-Marie intrusive suites. These intrusive units consist mainly of gabbronorite, mangerite, quartz syenite, orthopyroxene quartz syenite, syenogranite, alkali feldspar granite, charnockite and, less commonly, alkali feldspar quartz syenite, jotunite, monzodiorite, leuconorite and pyroxenite. Granitic to syenitic pegmatite dykes cut rocks of the area and a carbonatite dyke intrudes the Sainte-Hedwige Intrusive Suite. Mapped rocks are generally deformed, folded and cut by several faults and shear zones. The structural pattern is mainly oriented N-S to NNE-SSW. The area is characterized by amphibolite to granulite facies regional metamorphism. It hosts several types of mineralization offering a significant mineral potential allowing defining prospective zones for mining exploration:
- rare earth element ± Th ± Nb ± Ta mineralization in granitic dykes, syenitic and alkali feldspar granitic intrusive rocks and carbonatites;
- Fe-Ti ± P ± V mineralization in gabbronorite;
- Ni ± Cu mineralization in ultramafic intrusive rocks;
- mineralization of industrial minerals (sillimanite).
New Geophysical Surveys Published in 2020-2021
Continuing its mission of acquiring and processing geoscientific data, the Direction de l'acquisition des connaissances géoscientifiques (DACG) has carried out numerous aeromagnetic surveys over the past two years, most often combined with spectrometry. The blocks covered during this period are located in the Mistassini Lake, Lac-Saint-Jean, Basse-Côte-Nord, Nord du Québec, Abitibi-Témiscamingue and Outaouais regions. These surveys were carried out with a tie spacing of 200 m and a nominal flying height of 80 m to 90 m. They represent a total of 510 000 linear kilometres for an area of approximately 91 000 km2. The ultimate goal of these high-resolution surveys is to provide geological mapping assistance for both Géologie Québec and exploration company projects. These data help stimulate private investment by generating new prospective zones for mineral exploration. The technical reports and digital data related to these surveys are or will soon be available in Examine.