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19 Chapter 19Figure 19.1 (a) Block diagram illustrating tectonic locations where VMS depo...Figure 19.2 Global distribution of known land‐based VMS deposits (Mosier et ...Figure 19.3 Global distribution of modern hydrothermal vents and related pol...Figure 19.4 (a) Generalized geologic map of the Keweenaw rift, which is part...Figure 19.5 Geologic map of the Duluth Complex, part of the Keweenaw rift, i...Figure 19.6 World map displaying major PGE ore deposits.Figure 19.7 (a) Cross section of porphyry ore deposits illustrating metamorp...Figure 19.8 This global map illustrates 150 of the major porphyry deposits. ...Figure 19.9 (a) Copper and quartz vein within metamorphosed basalt.Figure 19.10 (a) Known LCT pegmatite deposits on Earth, color coded with res...Figure 19.11 Cobalt mine in greenstone belt in Bou Azzer Morocco.Figure 19.12 (a) Cross section illustrating skarns developing in association...Figure 19.13 (a) Global production of Iron ore in 2019. Image authored by PM...Figure 19.14 Algoma‐type deposits that form due to hydrothermal fluids inter...Figure 19.15 Cross section of Sedex deposits formed by an external, magmatic...Figure 19.16 Global map of major sedex deposits in continental settings. Not...Figure 19.17 Cross section of Canada's Robb Lake Zn‐Pb sulfide bodies in bre...Figure 19.18 Global map of the major MVT deposits. Note that these deposits ...Figure 19.19 Precious metals derived from magmatic veins are exposed, eroded...Figure 19.20 Roll‐front, tongue‐shaped uranium deposits form in stream chann...Figure 19.21 Intense weathering of peridotite igneous rock concentrates iron...Figure 19.22 Global map of bauxite deposits from karstic and laterite source...Figure 19.23 Some of the mineral commodities of which the USA imports >50%....Figure 19.24 Major import sources of nonfuel mineral commodities for which t...