Réjean Girard

• CEO at IOS Services Géoscientifiques Inc

Glacial drift exploration methods are well established and widely used by mineral industry exploring for blind deposit in northern territories, and rely on the dispersion of mineral or chemical signal in sediments derived from an eroded mineralized source. Gold grains themselves are the prime indicator minerals to be used for the detection of blind...

The quantitative and qualitative assessment of gold grains from samples of glacial till is a well-established method for exploring gold deposits hidden under glaciated cover. This method, which is widely used in the industry and has resulted in numerous successes in locating gold deposits in glaciated terrain, is still based on artisanal gravity se...

The discovery of new mineral deposits contributes to the sustainable mineral industrial development, which is essential to satisfy global resource demands. The exploration for new mineral resources is challenging in Canada since its vast lands are mostly covered by a thick layer of Quaternary sediments that obscure bedrock geology. In the course of...

The quantitative and qualitative assessment of gold grains from samples of glacial till is a well-established method for exploring gold deposits hidden under glaciated cover. This method, widely used by the industry and which produced numerous successes in locating gold deposits in glaciated terrain, is still based on artisanal gravity separation t...

The titanomagnetite of the Lac Doré Complex, an Archean layered intrusion that is located in the Abitibi greenstone belt in Québec (Canada), contains a wide variety of exsolution textures, which are the remnants of a complex cooling history. In the present study, we reconstitute the decomposition stages of the original solid solution in order to ex...

Reducing the Learning Population Size for Morphological Classification of Natural Materials: Example of Gold Grains from Backscattered Electron Images - Volume 24 Supplement - Alexandre Néron, Réjean Girard, Jonathan Tremblay, L. Paul Bédard, Kevin Bouchard

The Hutte Sauvage Group is an epicontinental siliciclastic sedimentary sequence deposited onto polycyclic gneiss of the Rae Province, between the New-Quebec (Labrador trough) and Torngat Lower Proterozoic orogens. Bounded to the west by the George River shear zone, the Hutte Sauvage Group shows an asymmetric facies distribution. From west to east,...

Shear-bands are discrete small-scale shear zones oriented at an acute angle to the main plane of anisotropy of a foliated rock. While this rock undergoes non-coaxial deformation, if the bulk direction of shear is not parallel to the main plane of anisotropy, which, in most cases, is a preferential locus for gliding, the strain will be partitioned b...

The conventional structural analysis software packages are designed to compute complex algorithms and to draw accurate projections. However, they are lacking in their data-management capabilities. A routine, built on spreadsheet software, is presented here which can perform data selection and editing in a fully interactive single keystroke format i...

Recent mapping in the high-grade terrain of Quebec east of the Labrador Trough, northeast of Schefferville, permits recognition of six distinct lithotectonic domains. These are, from west to east, the Laporte, Lac Tudor Shear Zone, De Pas, Riviere George Shear Zone, Mistinibi-Raude, and Mistastin domains. Three lithologic assemblages are found in t...

The Pallatin Intrusive Suite, located near the George River Shear Zone, is a granodioritic-gabbroic hypabyssal sill complex. It is continuous, through a dyke swarm, with basaltic and dacitic lava flows, rhyolite domes, and turbiditic volcaniclastic sediments belonging to the Ntshuku Complex. The sequence was developed in a bathyal environment and w...