A geoinformation system «World’s Largest Mineral Deposits» with a free access through Internet (i.e. webGIS) has been produced using the data base of large and super-large mineral deposits by Vernadsky’s SGM RAS which contains 1643 records for natural accumulations of the most important non-fuel raw materials. The main component of the GIS is the web application basing on the map services presented as GIS maps of tectonic and metallogenic content. In addition, the resource includes basic geographic layers from free informational sources. Allthe services and web application were created in English and Russian versions. The paper contains a description of the sequence of procedures used in their creation and justification for the preferences made in choosing of software products at all stages of production from initial GIS projects to the final web application. The produced system allows anybody to work with the information layers placed on a parent server and use a wide spectrum of functions including navigation, search, selection, sorting, and extraction outward the server. Besides, it is possible to insert the map services into GIS projects in the remote user’s computer as specific layers.