Mining Lands Administration System (MLAS) – Map Viewer

MLAS intro page image

Assistance for all matters related to the Mining Lands Administration System (MLAS) is available by calling us toll-free at 1-888-415-9845 (choose the Provincial Recording Office – Option 1). This toll-free line is staffed Monday to Friday from 8:30 a.m. to 5:00 p.m. At any time, clients may leave a voice message and we will return the call in accordance with Ontario’s Quality Service Standard


This MLAS map viewer is available to anyone for information purposes and only displays the location of active unpatented mining claims in Ontario.

View the technical specifications of the grid, including scale and how the grid is superimposed on the provincial map.

Available Data

In addition to active and pending mining claims, MLAS also displays the following data:

  • Alienations
  • Active and pending dispositions
  • Pending withdrawals and notifications
  • Administrative boundaries
  • Base data

Download Data

Mining Lands polygon data can be analyzed and combined with other data through the use of desktop geographic information system (GIS) software. Data is available in ESRI® ArcView® shape file format.

The data have been split into two files.
Operational data (claims and alienations, mining land tenure and non-mining land tenure) gets updated regularly and;
Administrative data (cell grid, lots and concessions, administrative boundaries, mining divisions, exploration regions, legacy claims and the provincial boundary).

MLAS Operational data [170Mb] (January 20, 2022) 
Administrative data [640Mb] (updated July 18, 2018)

Paper Maps

Mining claim maps can be purchased in paper format from the Publication Services Sales Coordinator. Maps are available at two standard scales: 1:20000 and 1:40000. Pricing varies depending on desired size and colour quality.

Historical Mining Claim Maps

Before claim maps were available online, mining claims had to be drawn, by hand, on a map made of paper, linen or Mylar. These mining claim maps are now known as historical mining claim maps. All historical mining claim maps have been digitized and are now available in electronic Portable Document Format (PDF) from the Historical Mining Claim Map website.

Withdrawals and Reopenings

The Minister may, by order, withdraw an area from prospecting, staking (mining claim registration as of April 10th), sale and lease, or may lift an existing withdrawal to re-open the area for those activities. These are referred to as withdrawal and reopening orders respectively.

To view a listing of withdrawals and reopenings visit the withdrawal and reopenings website.

June 1st Open List

Each year the Ministry publishes a list of lands and/or mining rights open for registration as of June 1st. This list is published in one issue of the Ontario Gazette. Please note that some of these lands may be subject withdrawal under the Mining Act and you are encouraged to reference mining claim maps and/or contact the Provincial Recording Office if you have any questions. Also published in the Ontario Gazette is a second list of lands that are in arrears for taxes.  If the total amount of taxes, penalties and costs are not paid by December 31 of the current year, the lands may be forfeited to the Crown. Note that some of the lands on the list may have mine hazards within their boundaries. Please conduct your mineral exploration activities accordingly.