The Lac Peters Area (NTS sheet 24M) is located in the southern part of the Douglas Harbour Domain (NE portion of the Minto Subprovince). It mainly consists of Archean rocks of the Superior Province. Early Proterozoic rocks of the Labrador Trough overlie the Archean craton in the easternmost part of the area. The contact between these two geological domains is characterized by an intense ductile deformation zone that formed under amphibolite-grade metamorphic conditions (sillimanite-muscovite schist). This deformation is attributed to the thrusting of Trough rocks onto the Archean craton. Archean rocks in the area are subdivided into three lithodemic units: 1) the Troie Complex (TC) located in the south-central part, 2) the Qimussinguat Complex (QC) in the northwestern part and 3) the Faribault-Thury Complex (FTC) covering the rest of the area. On a map showing the total residual magnetic field, the TC and the QC are characterized by a high, irregular magnetic pattern, whereas the FTC corresponds to magnetic lows. The FTC comprises large zones of intrusive rocks, generally gneissic or foliated, mainly composed of tonalite and trondhjemite. Amphibolite-grade volcano-sedimentary belts occur within these intrusive rocks. The most voluminous belts are informally named Faribault, Rivier, Tasiaalujjuaq, Hamelin, Curotte and Thury. These belts have variable dimensions. They can reach up to 5 km wide and over 20 km long. The TC and the QC essentially consist of gneissic or foliated intrusive rocks composed of orthopyroxene and clinopyroxene-bearing tonalite or granodiorite. These intrusive rocks contain granulite-grade volcano-sedimentary belts that are generally smaller in size than those found in the FTC. Only one belt was informally named in each complex: the Peters West belt in the TC and the Gorribon belt in the QC. The thickness of belts observed in the TC and the QC varies between 500 m and 1.5 km, but locally reaches over 3 km. These belts are often folded and dislocated. Belt segments vary between 1 and 15 km in length. Paragneisses in the FTC frequently contain a metamorphic assemblage composed of garnet + biotite ± sillimanite ± muscovite, whereas mafic volcanics consist of a hornblende + plagioclase ± quartz ± garnet assemblage. This mineralogy indicates amphibolite-facies regional metamorphic conditions. In the TC and the QC, the garnet + cordierite + spinel assemblage observed in paragneisses and the orthopyroxene + clinopyroxene + hornblende assemblage observed in plutons and volcanic rocks indicate that regional metamorphism reached the granulite facies. Prior to this survey, no showing or lithogeochemical anomaly had been discovered in the Archean rocks forming the Lac Peters Area. A total of 350 assays from rock samples collected in gossans or sulphide-bearing mineralization in various geological environments led to the discovery of three showings mineralized in Au, Ag, Cu, Zn and Pb, and 15 lithogeochemical anomalies significant in terms of mineral exploration. These showings and anomalies occur in three distinct geological environments: volcano-sedimentary belts, sulphide-facies iron formations and synvolcanic