The HWY 810 property extends across parts of three major east-west trending Archean aged geological domains and contains regionally extensive structural elements similar to those hosting significant gold deposits elsewhere in the Abitibi region. Due to extensive overburden and lack of outcrops through the region, little is known about the geology outside of information gained from geophysical surveys and historic drilling.
The northern-most domain is comprised dominantly of mafic volcanics and gabbroic intrusions of the Groupe d’Enjalran-Bapst. The domain also contains local interbeds of graphitic mudstone and intermediate-felsic volcanic tuffs. These units are reported to be weakly metamorphosed (greenschist facies), strike roughly east-west and dip steeply to sub-vertically towards the north.
The central domain is dominated by wackes and mudstones of the Groupe Taibi, which also contains local banded iron formations, conglomerates and lenses of tuffaceous volcanics. Past workers report that units are weakly to moderately metamorphosed (greenschist to amphibolite facies), strike roughly east-west and dip steeply towards the north. Local mafic and felsic dikes have been reported in some historic drill holes.
The final domain covers the southern portion of the property and has been the focus of the majority of historic exploration as it contains the greatest concentration of EM conductors. The Groupe d’Orvilliers-Desmazures is comprised of mafic volcanics with interbedded pyrite-rich graphitic mudstones and isolated intermediate-felsic tuffaceous volcanics. Past workers also report intersecting intermediate-felsic composition dikes in drill holes from several areas. The eastern part of this domain is intruded by the intermediate composition Pluton d’Orvilliers along a regional structural corridor.