Ontario Assessment File Database

Assessment Files contains the technical results from all exploration work done in the province of Ontario.

Data includes: details on location, property ownership, type of work done, commodities sought for each assessment file and a link to the PDF version of each file that is stored on GeologyOntario.

The database will assist exploration companies and individual prospectors in their efforts to locate new deposits within the Province of Ontario by allowing effective access to past exploration activity reports in Ontario.

This data is best viewed using Google Earth or similar Keyhole Markup Language (KML) compatible software. For instructions on how to use Google Earth, read the Google Earth tutorial.

[PDF]: portable document format [KML]: Keyhole Markup Language

Ministry contact: ndmminister@ontario.ca

Additional information

Geographic coverage
Last Validated Date
July 3, 2024
Update frequency

Ontario Assessment File Database

Learn more about accessing data using different formats.

No date range

  • WEB
    Data English

    Last Updated: July 2, 2024

  • WEB
    Data French

    Last Updated: July 2, 2024


Date range: January 1, 1890 - July 2, 2024

  • KML
    Assessment Files - KML English

    Last Updated: July 2, 2024


Report an issue with this data

Submit a report if you are experiencing issues with the data resources in this dataset.

Help us improve the Data Catalogue