OGSEarth provides geoscience data, collected by the Mines and Minerals division, which can be viewed using user-friendly geographic information programs such as Google Earth.

Available Data

OGSEarth provides data on the following topics:

  • Mining claims
  • Geology
  • Index maps
  • Administrative boundaries
  • Abandoned mines

Data Formats

The data provided by OGSEarth is available in Keyhole Markup Language (KML) format.

Viewing Data

OGSEarth data can be viewed using Google Earth or other applications compatible with Keyhole Markup Language.

To ensure that you get the current KML file, delete the Google Earth cache file before opening the KML.

  1. Open Google Earth
  2. select File>Server Sign Out
  3. Go to Tools>Options
  4. Select the Cache tab
  5. Click “Delete cache file” and then OK.
  6. Exit Google Earth and download the KML.

Google Earth

Google Earth is a 3D geographic mapping and viewing tool. For instructions on how to use Google Earth, read the Google Earth tutorial.

Source Data

OGSEarth data is created from a variety of sources. A link to the original source data is provided with each layer when available.

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If you need accessible formats or communications supports, please contact us.


Aggregate Test Results for Various Rock Types: Northern, Central and Southern Ontario

Aggregate test results represent the results of "standard" aggregate testing collected and collated by the Ontario Geological Survey (OGS).

Data includes: Formation/Rock Type, Petrographic Number, Micro Deval, Los Angeles Abrasion Test, Freeze Thaw, Absorption, Bulk Relative Density, Polish Stone Value, Average Aggregate Abrasive Value.

Download the Aggregate Test Results for Various Rock Types in GIS format.

Abandoned Mines

Abandoned Mines (Abandoned Mines Information System-AMIS) contains all known abandoned and inactive mine sites and features.

Data includes: information on mine site names, alias names, geographic township, site status, primary commodity, jurisdiction, mine features, hazard status, class and type, access and geospatial information

Download the Abandoned Mines database (updated January 30, 2017) in GIS format.

Activity Reports-Mineral Exploration

Get the latest news on mineral sector activity in Ontario. These reports contain monthly and year-to-date listings of mineral sector activity, and new information available at the Ontario Geological Survey’s 8 Resident Geologist District Offices.

The reports include company, project, and activity type, and links to corporate news releases. They also include lists of new assessment work received, new mineral deposit inventory data and Resident Geologist field activity. Some of this information may not be available on-line. Contact your District Office for access to it.

Aggregate Resources of Ontario (compilation)

The Aggregate Resources of Ontario—2015 (or ARO—2015) is a GIS-based compilation of the aggregate resources of Ontario is based on data compiled from aggregate resources inventory mapping conducted by the Ontario Geological Survey (OGS) from 1980 to 2015. This compilation includes data updated from the previously published information and may include newer geological data and/or mapping, where the latter are available. It is intended that this compilation will be updated annually.

Download the Aggregate Resources of Ontario (compilation) in GIS format

Assessment Files

Assessment Files contains the technical results from all filed assessment work done in the province of Ontario.
Data include: 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.

Download the Assessment Files database in GIS format.

Assessment files received from April 2014 through December 2016 are now accessible on an interim basis through OGSEarth.

Download the April 2014-December 2016 Assessment Google Earth File.

Bedrock Geology

Bedrock Geology contains information about the solid rock underlying the Province of Ontario at a compilation scale of 1:250 000.

Data includes: bedrock units, major faults, dike swarms, iron formations, kimberlites and interpretation of the Precambrian bedrock geology underlying the Hudson Bay and James Bay lowlands Phanerozoic cover.

Download the Bedrock Geology data in GIS format.

Drill Holes

Drill Holes contains information on surface and underground drilling done as outlined by assessment files.

Data includes: company name, company hole number, township and a link to the full drill hole record on GeologyOntario.

Download the Diamond Drill Hole database in GIS format.

Earth Resources & Geoscience Mapping Section 2017 Project areas

The Ontario Geological Survey (OGS) carries out field-based investigations to define and understand geological processes and the earth resources to support mineral investment priorities and inferences about the state of the environment, natural hazards, public health and safety, and climate change adaptation. As the steward of Ontario's public geoscience data and information, the OGS provides public access to these information and knowledge holdings.


Elevation contains elevation data acquired from Nasa through the Shuttle Radar Topography Mission.

Data includes: shaded relief and elevation models displaying terrain elevation across the province of Ontario.


The Geophysics kml contains polygons and images illustrating areas that have published digital data products released by the Ontario Geological Survey.

Geoscience Theses

Geoscience Theses is a collection of university theses held by the OGS’s 8 district office libraries.
The collection includes a wide variety of undergraduate and graduate theses on geoscience subjects relevant to the district.

Data includes author, title and keywords. The theses are geospatially located based on subject matter. The complete theses catalogue for each district is accessible through the KML download file

Geotechnical Boreholes

Geotechnical Boreholes contains records of boreholes constructed during geotechnical investigations.

Data includes: information on the Geological Stratum identified down each hole as well as the hole depth.

Gravity and Aeromagnetic Data

Gravity and Aeromagnetic contain ground field reading of gravity strengths and airborne surveys of magnetic strengths from across the province of Ontario.

Data includes: gravity and magnetic information.

Download the Single Master Gravity and Aeromagnetic data.

Mineral Deposits (MDI)

Mineral Deposits contains an overview of mineral occurrences in the province of Ontario.

Data includes: occurrence type, primary and secondary commodity, deposit name and a link to the full record on GeologyOntario.

Download the Mineral Deposit Inventory database in GIS format (updated November 1, 2017).

Precambrian Bedrock Magnetic Susceptibility Geodatabase

Magnetic susceptibility (sometimes known as volume susceptibility) is the fundamental rock parameter in magnetic prospecting. 

Data includes: magnetic susceptibility readings from various rock types. Magnetic susceptibility refers to the degree to which a substance can become temporarily magnetized while within an applied magnetic field.

Download the Precambrian Bedrock Magnetic Susceptibility Geodatabase in GIS format.

Quaternary Geology

Ontario's Quaternary Geology at a compilation scale of 1:1 000 000.

This layer includes Quaternary geology units, point features such as drumlins and glacial striae and line features such as eskers, shore bluffs and moraines.

Download the Quaternary Geology data in GIS format.

Southern Ontario
3D Mapping of Surficial Aquifers

3D Mapping of Surficial Aquifers contains information regarding the three dimensional distribution and character of surficial materials that may form groundwater aquifers and aquitards.

Data includes: borehole information, isopachs, structural contours and both bedrock and surficial geology image overlays.

Ambient Groundwater Geochemistry

Ambient Groundwater Geochemistry contains detailed inorganic chemistry data collected from over 2300 water samples from southern Ontario.

Data includes: well information, dissolved gases, major ions, trace elements, field measurement of temperature, PH, redox potential and electrical conductivity.

Download the Ambient Groundwater Geochemistry data in GIS format.

Bedrock Topography and Overburden Thickness

Bedrock Topography and Overburden Thickness contain a bedrock elevation map and information on the thickness of material deposits above the bedrock surface.

Data includes: an interpolated bedrock surface created from a variety of existing point data, a bedrock shaded relief grid and an interpretation of overburden thickness.

Download the Bedrock Topography and Overburden Thickness data in GIS format.


Karst contains a layer which depicts the nature and regional distributions of karstification of Paleozoic bedrock units within thin drift and exposed bedrock regions of southern Ontario and Manitoulin Island.

Data includes: karst point features such as caves, sink holes and disappearing streams, karst and Paleozoic geological units and photographs of various karst features.

Download the Karst data in GIS format.

Paleozoic Geology

Paleozoic Geology contains a layer which depicts southern Ontario geological units formed during the Paleozoic era.

Data includes: Paleozoic geological units, linear features such as faults, point features such as quarries, drill hole and outcrop locations and photos depicting key sections of each of the Paleozoic rock formations found across southern Ontario.

Download the Paleozoic Geology data in GIS format.


Physiography contains information on the physical structure of southern Ontario.

Data includes: lineral features such as beaches and escarpments, point features such as dunes and mudflow scars, landforms such as drumlins and moraines and physiographic regions.

Download the Physiography data in GIS format.

Southern Ontario Stream Sediment Geochemistry Survey

The Southern Ontario Stream Sediment Geochemistry Survey consists of stream sediment data including inorganic (metals) chemistry concentrations determined in 2113 samples collected across southern Ontario.

Data includes: Geochemical metals data determined by ICP, loss-on-ignition (LOI) and particle size analysis (PSA) data including quality control results from Certified Reference Materials (CRMs) and analytical (pulp) duplicates.

Surficial Geology

Surficial Geology contains a layer which depicts the distribution and characteristics of surficial deposits across southern Ontario.

Data includes: surficial geology units, linear features such as eskers and bluffs, point features such as drumlins or striae, gravel pit and quarry locations.

Download the Surficial Geology data in GIS format.

Administrative Boundaries and Spatial Reference Grids
Administrative Boundaries and Spatial Reference Grids

Administrative Boundaries and Spatial Reference Grids contains layers which define different areas of the province according to number of classifications.

Indexes to Existing Maps and Digital Data
Aggregate Resources

Aggregate Resources contains reports on the nature and extent of sand, gravel and bedrock resources within specific areas across Ontario.

Data includes: locations of aggregate resource studies with a link to the report and associated maps on GeologyOntario.

Download the Aggregate Resource Index in GIS format.

Geological Maps and Digital Data

Geological Maps and Digital Data contains outlines illustrating areas that have published products released by the Ontario Geological Survey.

Data includes: published product locations with links to download the product from GeologyOntario.

Northern Ontario
Far North Predictive Mapping

Far North Predictive Mapping contains an interpretation and classification of surficial materials in the Far North of Ontario as predicted by a combination of satellite imagery, digital elevation models and limited on the ground field observations.

Data includes: polygon features of surficial geology material distribution and areas of Rögen moraines, karst and palsas and linear features, such as eskers, drumlins, crests of moraines and abandoned shoreline features.

Geology Terrain (NOEGTS)

Geology Terrain contains an evaluation of near-surface geological conditions such as material, landform, topography and drainage.

Data includes: land form type, geomorphology, primary material, secondary material, topography and drainage condition, point features such as sand and gravel pits, sand dunes, drumlins, eskers, landslide scars and index maps to study areas.

Download the Geology Terrain (NOEGTS) data in GIS format.

Rhyolite Occurrences Northern Ontario

Rhyolite contains a layer which depicts the location and composition of various rhyolite occurrences across northern Ontario.

Data includes: approximate location, physical character, age and the chemical nature of each rhyolite occurrence.

Download the Northeastern Ontario Rhyolite Database in GIS format.

Mining Claims
Mining Claims

(updated November 17, 2017)

Mining Claims contains active claims, alienations and dispositions.

Data includes: links to further land tenure information.

Note: The claims data presented here is an unofficial version to be used only for viewing purposes. Official mining claim information is available from the CLAIMaps and Mining Claims Information applications.