Through the 4.6 Gyr of Earth’s history, ore deposit has been formed via close linkage with the evolution of this planet. Ore deposit is an abnormally enriched material of targeted elements and its enrichment mechanism mac-roscopically controlled by “Geology” and microscopically controlled by “Geochemistry”. “Front line of economic geology” is the first collaborative special volume by two Japanese academic journals of Chikyukagaku（Geochemis- try）and Shigen-Chishitsu, aiming to review the metallogenesis, recent progresses and unsolved questions in each type of ore deposit for future researches on economic geology and geochemistry. This collaborative special volume will be followed by volume 3 in the next year.
