Keywords

(a) Any of the more common and more chemically active metals, e.g. lead, copper.  (b) The principal metal of an alloy, e.g. the copper in brass.

Geological keywords, such as “granite”, “lake”.  The definitions are generally taken from the AGI Glossary of Geology.  Keywords with a geographic context (e.g. Cape Smith Fold Belt, Selwyn Basin, Grenville Province) are assigned to a separate category.