Structural types of ore deposits associated with volcanic necks

Volcanic necks, with or without caldera, are classified into several subtypes, depending on shape, structure, genesis, differentiation, tectonics and other characteristics of the fillings, with attention to the associated orefields (if any), ore bodies or veins, and the kind of mineralization, such as U (± F), U-Mo, Au-Ag, Hg, F (± B), B-Sn (± Ag), Cu-B, polymetallic (± F), carbonatite-rare metals, hematite-magnetite, with examples drawn from different parts of the world. – IGR Staff.