Gold is a commodity that occurs in Canada in a wide variety of both geological settings and ore deposit types. Byproduct gold from volcanogenic massive sulphide deposits, nickel-copper deposits, porphyry copper-molybdenum deposits, and the Chibougamau copper deposits accounts for approximately one-third of Canadian resources. The remainder occurs in gold-only deposits which comprise placers (5%) and bedrock sources (60%), termed lode gold deposits (e.g. Cooke, 1946). Lode gold deposits are present in all of the major tectonic subdivisions of the Canadian landmass but occur dominantly in terranes with an abundance of volcanic and clastic sedimentary rocks of low to medium metamorphic grade. Economically viable deposits are concentrated primarily in the Archean greenstone terranes of Superior and Slave provinces, with lesser numbers in the Mesozoic-Cenozoic rocks of the Cordillera, the Proterozoic greenstone sequences of Trans-Hudson Orogen and Grenville Province, and the Paleozoic sequences of the Appalachians (Fig. 15-1).