The Mineral Deposit Inventory 2010 is a digital geoscience database that provides an overview of mineral occurrences within the province of Ontario. The database contains information on metallic and industrial mineral deposits, as well as some building stone and aggregate sites. This deposit information can be used as source data for geographic information systems and earth science analysis for research and mineral exploration.

The Ministry of Northern Development, Mines and Forestry is releasing an updated version of the Mineral Deposit Inventory (MDI). This database is an inventory of mineral deposits in the province of Ontario and supersedes previous MDI releases, including this one for 2010. Originally compiled in the early 1970s by the Resident Geologist Program (RGP), the database is continually being reviewed and updated by RGP staff. There are approximately 950 new records and 2000 updated records.

Each MDI record provides all or some of the following information: deposit name(s), location, status (e.g., occurrence, prospect, producer, past producer), commodities, character/classification, geological structure, lithology, minerals and mineral alteration, geochemistry, exploration history, and production and reserve data where available. Also included are notes on deposit visits and references to additional publications related to the deposit.

MDI data are provided in 2 formats in this release: 1) a relational database, and 2) MDI provincial coverage in a geospatial GIS format.

Supplementary tables can be used and are available for download from the additional documentation section. Supplementary look-up table descriptions are available in the data description document, which is available for download from the additional documentation section.