Canada · Jurisdiction guide
Mining tenement data & monitoring in Ontario
Ontario moved to online, map-based cell claims in 2018, and today all claim registration and management runs through the Mining Lands Administration System (MLAS). That makes Ontario tenure fully digital - and highly monitorable - under the province's Mining Act.
How mineral tenure works in Ontario
Ontario's Mining Act establishes a self-initiated claim system that, since 2018, is entirely map-based. Instead of physically staking ground, a licensed prospector selects cells on the provincial grid and registers a claim online in MLAS. Holding a valid prospector's licence is a prerequisite, and claims must be maintained with assessment work to remain in good standing.
Not all ground is open: existing claims, patented lands, withdrawals and other alienations remove cells from availability. Ontario also publishes an annual list of lands and mining rights open for registration as of June 1, which can trigger competitive interest in newly available ground.
Where to find Ontario claim data
MLAS is both the registry and the map. You can view active unpatented mining claims, inspect the cell grid, and see mining and non-mining land tenures. The system also publishes operational and administrative data as ESRI shapefiles, so claims, alienations and tenure boundaries can be analysed in GIS alongside geoscience.
Because staking and maintenance are digital, the public record updates as transactions occur - a claim registered or forfeited is reflected in the system rather than waiting on paper filings.
Monitoring claim availability and forfeitures
In a map-selection system, ground reopens the instant a claim is not maintained or is otherwise forfeited, and adjoining cells can become strategically valuable when a neighbour's claim lapses. The annual June 1 open list adds a scheduled wave of availability on top of these organic changes.
Monitoring Ontario therefore means watching both cell-level forfeitures around your targets and the broader open-lands releases - a task well suited to automation given the fully digital record.
What this means for exploration teams
Ontario's digital claim system levels the playing field on access but sharpens competition on timing: whoever registers open cells first secures them. Watching for lapsing claims and reading the June 1 list quickly are concrete advantages.
Xplore360 Land Monitoring is designed to track claim availability across jurisdictions like Ontario, flag cells opening around your ground, and pair that with geoscience so you can act with confidence.
Tenement types in Ontario
Governed by the Mining Act (Ontario).
Unpatented mining claim (cell)
A claim over one or more cells on the provincial grid, registered and maintained online in MLAS; requires a valid prospector's licence.
Boundary claim
A claim on a cell only partly open to registration, reflecting pre-existing tenure or boundaries.
Mining lease
A longer-term tenure that follows a claim, required for development and production.
FAQ
Ontario tenement FAQs
Common questions about Ontario mineral tenure, registries and monitoring.
- How do I register or view a mining claim in Ontario?
- Ontario uses the Mining Lands Administration System (MLAS) to view active unpatented claims and register new cell claims online. You need a valid prospector's licence to register a claim under the Mining Act.
- Does Ontario still allow physical staking?
- No. Since 2018 Ontario uses online, map-based cell claims registered in MLAS rather than physical ground staking.
- How does ground become available in Ontario?
- Cells reopen when claims are not maintained or are forfeited, and Ontario publishes an annual list of lands open for registration as of June 1. Xplore360 Land Monitoring can track these openings around your targets.
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