Orogenic gold deposits of all ages, from Paleoarchean to Tertiary, show consistency in
chemical composition. They are the products of aqueous-carbonic fluids, with typically 5–20 …

Metamorphic belts are complex regions where accretion or collision has added to, or
thickened, continental crust. Gold-rich deposits can be formed at all stages of orogen …

The term orogenic gold deposits has been widely accepted, but there has been continuing
debate on their genesis. Early syn-sedimentary or syn-volcanic models and hydrothermal …

Epigenetic gold deposits in metamorphic terranes include those of the Precambrian shields
(approx 23,000-25,000 t Au), particularly the Late Archean greenstone belts and …

Porphyry deposits arguably represent the most economically important class of nonferrous
metallic mineral resources. These magmatic-hydrothermal deposits are characterized by …

Although the term orogenic gold deposit has been widely accepted for all gold-only lode-
gold deposits, with the exception of Carlin-type deposits and rare intrusion-related gold …

China produces about 450 t Au per year and has government stated in-ground reserves of
approximately 12,000 t Au. Orogenic gold, or gold deposits in metamorphic rocks, and …

The Cordilleran orogen of western Canada and Alaska records tectonic processes than
span over 1.8 billion years, from assembly of the Laurentian cratonic core of Ancestral North …

Reduced intrusion-related gold systems (RIRGS) are characterized by widespread arrays of
sheeted auriferous quartz veins that preferentially form in the brittle carapace at the top of …

Although most economic geology research is concentrated at the deposit or mineral-system
scale for a single well-defined deposit group with a consistent metal association, there are …