This single volume examines ore-forming processes from many different angles. The reader learns what the minimum concentration of different metals is that makes them economically feasible for exploitation. Metallogenic epochs are identified in the Precambrian. The author Robb does not believe that surficial geology alone is sufficient to explain economically-viable concentrations of metals. He suggests (p. 28) that deep-earth processes govern the regional abundance of metals, explaining, for instance, why so much gold is found in South Africa.
There is much emphasis in this book on hydrothermal processes, as these are an important causative agent in economic deposit formation. Many helpful diagrams illustrate the dynamics of hydrothermal activity.
A variety of technical information is presented. For instance, Stokes Law is illustrated in terms of the equivalent diameters of gold, quartz, and pyrite spheres that would settle out of water at the same velocities relative to each other.
Very little attention is paid to the rare earth elements, which have assumed increasing importance in recent years. However, the behavior of REE ions, as compared with other ions, is presented (p. 221). REEs are often concentrated in alkaline magmas (p. 27), and can form in extensional settings (e. g., in incipient rifts, or intra-continental hotspots), often in carbonatites (p. 340). Pegmatites, commonly a host of REEs, are discussed in some detail. Skarns are also elaborated, although without mention of the fact that they are often REE-bearing.