Geoscience Assessment Office

Who We Are

The Geoscience Assessment Office, is a unit within the Mining Lands Section, the mandate of which is to

• assess geoscientific information submitted for assessment work credit to ensure compliance with the Mining Act and Assessment Work Regulation    
• ensure that the geoscience data are made available to explorationists to support them in their intense and often costly search for new mineral resources
• provide information and expertise to clients regarding the proper filing of assessment work and technical data

Our Clients

• any person or company interested in performing exploration work to keep their mining claims in good standing
• claim holders
• industry contractors and land managers who file carry out exploration work or file work on behalf of claim holders

What We Provide

• information bulletins (see below) and advice on what exploration work qualifies for assessment work credits and how to file the form and report for assessment work credit
• an up-to-date website on any changes to the Assessment Work Regulation
• the checklists for the information required in technical reports  
• the required forms to file your assessment work and the forms required to distribute any credit you may have in reserve

The approved exploration data are then made available to the public, in the John B. Gammon Geoscience Library and the Resident Geologist’s Office for the area where the work was performed.

What Is Assessment Work?

To keep the rights to explore and develop staked mining lands in Ontario, clients must do exploration work on the lands and send a record of their work to our ministry. Our Geoscience Assessment Office makes sure that the work obeys the Mining Act and regulations by asking for revisions, if necessary, and by checking the costs of the work. Our staff tell claim holders what the approved value of the assessment work is. We then send the approved work to the Resident Geologist Offices and the Assessment File Library.

Recent Information Articles

• Launch delay of Electronic Assessment Work System (EAS) Application
• A Guide for Filing Assessment Work in Ontario via Compact Disk (CD)
• Notice regarding changes to the Claim Staking Regulation, Assessment Work Regulation, Forms Regulation and Section 52(1) of the Mining Act
• Geoscience Assessment Office - Changing to serve you better
• Proof of Costs Policy - Updated
• New policy regarding eligible assays and analyses for assessment work credit
  (Policy U.C. 703-4)
• Changes to the Assessment Work Regulations
• Bank Credit vs. Reserve Credit
• Surface Rights Notification to Perform Assessment Work - Deadline
• Banked Credits Not Applied Automatically
• Re-cutting Claim Boundary Lines
• Exploration Expenditures Not Eligible for Assessment Work Credit
• Assessment Work Submissions - Anniversary Date
• Notice to Claim Holders and Authorized Agents - Change of Address
• Amendments to Part VII of the Mining Act

For inquiries regarding Assessment Work, contact:
Toll Free phone 1-888-415-9845, Toll Free Fax 1-877-670-1555

Mailing address:
Willet Green Miller Centre, 933 Ramsey Lake Road, 3rd Floor, Sudbury, Ontario  P3E 6B5