Scopus from Elsevier is a comprehensive abstract and citation database of peer-reviewed literature and features tools to analyze and visualize research
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* SciFinder Scholar
Scifinder-n by the American Chemical Society is an excellent database for literature on geochemistry, mineralogy, metallurgy and fossil fuels.
Digitized back issues of academic journals, but also includes books and other primary sources as well as current issues of journals
Looking for information on environment impact?
* SA GEOLit
Contains information on geoscience publications, held by the Information Centre of the Council for Geoscience (CGS). About 1880 - present
* Sabinet African Journals (includes South African journals) (also indexed on abstract databases)
A comprehensive geosciences database by the American Geological Institute. More than 3500 journals, books, maps, government reports, conference papers and theses and dissertations