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Ontario Geological Survey

Mineral-Related Activity in the Southern Ontario Resident Geologist District
between January 2025 and May 2025


Mining and Exploration Activity
CompanyProperty Township or Area Commodity Work Type

Assessment Files Received
Company Property Assessment File Township or Area Work Type
Blake Davis, Darren Davis Cedar Lake Browns Bay Claim 20000022694
Barrie Geological Survey / Mapping, Prospecting By Licence Holder
Earth Resources Ltd Bass Lake Claims 20000022627
Galway Assaying and Analyses, Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Earth Resources Ltd Horseshoe Lake Claims 20000022519
Cavendish, Glamorgan Assaying and Analyses, Prospecting By Licence Holder, Rock Sampling
Jordan Clements Marble Lake Claim 20000022618
Barrie Geological Survey / Mapping, Manual Labour, Prospecting By Licence Holder, Rock Sampling
Skead Holdings Ltd 20000022685
Cardiff, Monmouth Assaying and Analyses
Skead Holdings Ltd 20000022686
Lavant Assaying and Analyses

Mineral Inventory Updates
Deposit Name MDI Identifier Township or Area Primary Commodity Secondary Commodity Mineral Deposit Status
Addington Mine MDI31C11NE00010 Kaladar Gold Copper, Silver, Tungsten Past Producing Mine With Reserves or Resources
Allied Chem G-4 Anderdon 35-1 MDI40J03NE00005 Anderdon Silica Sand Discretionary Occurrence
Amherst Quarries - Amherstburg Quarry MDI40J03SE00038 Malden Dolostone, Limestone (Crushed Stones) Dolomite (Building Stone) Producing Mine
Austin Corners Quarry MDI30M12NW00006 Esquesing Sandstone Occurrence
B.A. No.23-Warwick 22-6n MDI40P04SW00010 Warwick Salt Discretionary Occurrence
Bannockburn MDI31C12NE00019 Madoc Iron, Sulphur/Pyrite Past Producing Mine Without Reserves or Resources
Belmont Iron MDI31C12SW00004 Belmont Magnetite Developed Prospect With Reported Reserves or Resources
Bessemer Mine MDI31F04SE00012 Mayo Iron Developed Prospect Without Reported Reserves or Resources
Bicroft (Centre Lake) MDI31D16NE00043 Cardiff Uranium Thorium Past Producing Mine With Reserves or Resources
Bicroft (Croft) MDI31E01SE00224 Cardiff Uranium Prospect
Big Creek 1 MDI40J03SE00002 Malden Silica Sand Discretionary Occurrence
Big Creek 3 MDI40J03SE00003 Malden Silica Sand Discretionary Occurrence
Black Lake MDI31C10SE00026 Bedford Magnetite Past Producing Mine Without Reserves or Resources
Blackhawk MDI31C12SE00096 Marmora Wollastonite Developed Prospect With Reported Reserves or Resources
Blairton MDI31C05NW00026 Belmont Magnetite Past Producing Mine With Reserves or Resources
Blue Rock MDI31D16NE00143 Monmouth Uranium Rare Earth Elements Developed Prospect With Reported Reserves or Resources
Bluff Point Mine MDI31F07SE00011 Bagot Iron Prospect
Bob Neill MDI31C12SE00034 Marmora Gold Occurrence
Brown-Rabidoux 1 Malden 80-7 MDI40J03SE00015 Malden Silica Sand Discretionary Occurrence
Brunner Mond #6 Anderdon 7-28-Rr MDI40J03NE00006 Anderdon Silica Sand Discretionary Occurrence
Brunner Mond #A-2 MDI40J03NE00004 Anderdon Silica Sand Discretionary Occurrence
Buckhorn Mines Property MDI31F07NE00069 Bagot Molybdenum Prospect
C.W. 1 15-1 Malden 15-1 MDI40J03SE00020 Malden Silica Sand Discretionary Occurrence
C.W.P. #1 MDI40J03SE00005 Malden Silica Sand Discretionary Occurrence
Cadieux Zinc Prospect MDI31F07NE00063 Admaston Lead, Zinc Developed Prospect With Reported Reserves or Resources
Calabogie Deposit MDI31F07SE00009 Bagot Iron Vanadium Developed Prospect With Reported Reserves or Resources
Caledonia Gypsum Co. MDI30M04SW00010 Seneca Gypsum Past Producing Mine Without Reserves or Resources
Canad. Delhi-Br1 Anderdon 10-6 MDI40J03NE00007 Anderdon Silica Sand Discretionary Occurrence
Canad. Delhi-Homf Colchester North 13nmr MDI40J02NW00002 Colchester Silica Sand Discretionary Occurrence
Canad. Delhi-Mc1 Anderdon 9-8 MDI40J02NW00003 Anderdon Silica Sand Discretionary Occurrence
Canada Cement Lafarge Kettle Point Shale MDI40J16NE00002 Plympton Shale (Structural Material) Discretionary Occurrence
Canadian Dyno MDI31D16NE00032 Cardiff Uranium Thorium Past Producing Mine With Reserves or Resources
Canadian Hemisphere Petroleum No.2 MDI40P13SE00007 Wawanosh Salt Discretionary Occurrence
Canadian Salt - Sandwich Brine Field-1 MDI40J06SE00003 Sandwich Salt Past Producing Mine Without Reserves or Resources
Canadian Salt - Windsor Brine Field MDI40J06SE00008 Sandwich Salt Past Producing Mine Without Reserves or Resources
Canadian Salt Co.-Sandwich Brine Field-2 MDI40J06SE00004 Sandwich Salt Producing Mine
Cavendish Prospect MDI31D16SW00099 Cavendish Uranium Thorium Developed Prospect With Reported Reserves or Resources
Chaffey MDI31C09NW00011 South Crosby Magnetite Titanium Developed Prospect With Reported Reserves or Resources
Charlotteville 18 Conc. V MDI40I16SW00003 Charlotteville Gypsum Discretionary Occurrence
Childs Mine MDI31F04SE00013 Mayo Iron Developed Prospect With Reported Reserves or Resources
Clyde Forks MDI31F02SE00064 Lavant Antimony, Copper, Mercury, Silver Arsenic, Barite, Bismuth Prospect
Coe Hill MDI31C13SW00010 Wollaston Iron Developed Prospect Without Reported Reserves or Resources
Colonial Malden 4-42-4 MDI40J03SE00016 Malden Silica Sand Discretionary Occurrence
Colwell Grove MDI40J03SE00004 Malden Silica Sand Discretionary Occurrence
Consol. West 104 Malden 63-4 MDI40J03SE00017 Malden Silica Sand Discretionary Occurrence
Consol. West. Petrl. Malden Kp-1s MDI40J03SE00018 Malden Silica Sand Discretionary Occurrence
Cooper East MDI31C11NW00023 Madoc Soapstone, Talc Developed Prospect With Reported Reserves or Resources
Cordova MDI31C12SW00005 Marmora Gold Past Producing Mine With Reserves or Resources
Corunna Brine Field MDI40J16NW00004 Moore Salt Past Producing Mine Without Reserves or Resources
Coste-Drke-Lani Malden 68-6 MDI40J03SE00019 Malden Silica Sand Discretionary Occurrence
Cwp-Flemont 2 Malden 62-7 MDI40J03SE00021 Malden Silica Sand Discretionary Occurrence
Dingman MDI31C12SE00040 Marmora Gold Developed Prospect With Reported Reserves or Resources
Dome Storage C Snadwich West 59-1 MDI40J06SE00007 Sandwich Silica Sand Discretionary Occurrence
Dow - Moore 2-20-12 MDI40J16NW00017 Moore Salt Discretionary Occurrence
Dow Chemical - River Front Brine Field MDI40J16NW00007 Sarnia Salt Past Producing Mine Without Reserves or Resources
Dow Chemical-Moore Twp. Brine Field No.1 MDI40J16NW00008 Moore Salt Past Producing Mine Without Reserves or Resources
Dow Chemical-Moore Twp. Brine Field No.2 MDI40J16NW00003 Moore Salt Past Producing Mine With Reserves or Resources
Dow-Sarnia 1-16-2 MDI40J16NW00024 Sarnia Salt Discretionary Occurrence
Drake Walk-Hia Colchester South 1-2 MDI40J02SW00004 Colchester Silica Sand Discretionary Occurrence
Drake Walker G1 Malden Kp-1s MDI40J03SE00022 Malden Silica Sand Discretionary Occurrence
Drake-Walk-Park 1 Malden 83-7 MDI40J03SE00023 Malden Silica Sand Discretionary Occurrence
Drake-Walk-Rod Anderdon 5-8 MDI40J02NW00004 Anderdon Silica Sand Discretionary Occurrence
Drake-Walk-Wild1 Malden 87-8 MDI40J03SE00024 Malden Silica Sand Discretionary Occurrence
Drake-Walk. Dl1 Colchester South 7-5 MDI40J02SW00003 Colchester Silica Sand Discretionary Occurrence
Drake-Walk. Km1 Colchester South 3-3 MDI40J02SW00005 Colchester Silica Sand Discretionary Occurrence
Dupel MDI31E02SW00004 Hindon Copper Occurrence
East Cemetary MDI31C11SW00049 Elzevir Soapstone, Talc Discretionary Occurrence
Elliot Point Farm MDI40J03SE00006 Malden Silica Sand Discretionary Occurrence
Empire B Zone MDI31D16NE00146 Monmouth Uranium, Yttrium Fluorite, Thorium Developed Prospect With Reported Reserves or Resources
Essex G&O 8 Malden 14-2 MDI40J03SE00025 Malden Silica Sand Discretionary Occurrence
Essex Oil & Gas #11 MDI40J03SE00008 Malden Silica Sand Discretionary Occurrence
Essex Oil & Gas #6 MDI40J03SE00007 Malden Silica Sand Discretionary Occurrence
Faraday MDI31F04SW00037 Faraday Thorium, Uranium Past Producing Mine With Reserves or Resources
Farcroft MDI31D16SE00059 Anstruther Uranium Developed Prospect Without Reported Reserves or Resources
Fission MDI31E01SE00235 Cardiff Fluorite, Uranium Thorium Prospect
Garland MDI31D16SW00093 Anstruther Uranium Thorium Prospect
Gateford MDI31C11NW00050 Madoc Gold Copper, Lead, Silver, Talc, Zinc Developed Prospect Without Reported Reserves or Resources
Gawley No.1 MDI31C12SE00025 Marmora Gold Prospect
General Chem.-Brunner Mond Brine Field MDI40J03NE00002 Anderdon Salt Past Producing Mine Without Reserves or Resources
General Chemical-Anderdon Brine Field MDI40J03NW00002 Anderdon Salt Past Producing Mine Without Reserves or Resources
Glendower MDI31C10SE00022 Bedford Iron Phosphate Past Producing Mine Without Reserves or Resources
Globe Graphite Mine MDI31C16SE00016 Elmsley Graphite Mineral Specimen, Tourmaline Developed Prospect Without Reported Reserves or Resources
Goderich Salt Company Brine Field MDI40P13SE00002 Colborne Salt Past Producing Mine Without Reserves or Resources
Grey, Young & Sparling - Wingham Brine Field MDI40P14NW00002 Wawanosh Salt Occurrence
Greyhawk Mine MDI31F04SW00036 Faraday Uranium Thorium Developed Prospect With Reported Reserves or Resources
Hampshire Mills DH 1 MDI31D11NW00006 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hampshire Mills DH 6 MDI31D11NW00007 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hampshire Mills DH-12 MDI31D11NW00010 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hampshire Mills DH-14 MDI31D11NW00005 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hampshire Mills DH-2 MDI31D11NW00009 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hampshire Mills DH-3 MDI31D11NW00008 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Hardie MDI31C14SE00042 Barrie Copper, Gold, Silver, Zinc Antimony, Lead Prospect
Harmon - Moore 8-9-11 MDI40J16NW00019 Moore Salt Discretionary Occurrence
Harvest Pet.Ihs Colchestersouth 76-Front MDI40J02SW00006 Colchester Silica Sand Discretionary Occurrence
Hilltop Quarry-1 MDI30M12NW00008 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Hilltop Stone and Supply Quarry MDI30M12NW00004 Esquesing Sandstone Developed Prospect Without Reported Reserves or Resources
Howland Mine MDI31D15SE00096 Snowdon Magnetite Past Producing Mine Without Reserves or Resources
Imperial 114 Colchester North 15-Smr MDI40J02SW00007 Colchester Silica Sand Discretionary Occurrence
Imperial 412-R. McCabe No.1 MDI40P12NE00011 Colborne Salt Discretionary Occurrence
Imperial 526-6.Feagan No.1 MDI40P13SW00002 Ashfield Salt Discretionary Occurrence
Imperial 554-M. Turnbull No.2 MDI40P05SE00006 Stephen Salt Discretionary Occurrence
Imperial 562-E.A. Toll No.1 MDI40P14SW00003 Wawanosh Salt Discretionary Occurrence
Imperial 583-P. Fisher No.1 MDI40P12NE00010 Colborne Salt Discretionary Occurrence
Imperial 658-J. Wain No.1 MDI40P12SE00005 Goderich Salt Discretionary Occurrence
Imperial 710 Colchester South 79-Front MDI40J02SW00008 Colchester Silica Sand Discretionary Occurrence
Imperial 802 Paq 1 Malden 7-49-5 MDI40J03SE00028 Malden Silica Sand Discretionary Occurrence
Imperial 851 Colchester South 2-3 MDI40J02SW00011 Colchester Silica Sand Discretionary Occurrence
Imperial No. 739 Colchester South 3-Gore MDI40J02SW00009 Colchester Silica Sand Discretionary Occurrence
Imperial No. 751 Malden 25-3 MDI40J03SE00026 Malden Silica Sand Discretionary Occurrence
Imperial No. 769 Cal Van-Malden 75-10-11 MDI40J03SE00030 Malden Silica Sand Discretionary Occurrence
Imperial No. 806 Malden 73-6 MDI40J03SE00029 Malden Silica Sand Discretionary Occurrence
Imperial No.741 Cochester North 12 Nmr MDI40J02NW00005 Colchester Silica Sand Discretionary Occurrence
Imperial No.772 Colchester North 14 Smr MDI40J02SW00012 Colchester Silica Sand Discretionary Occurrence
Imperial No.773 Anderdon 9-6 MDI40J03NE00008 Anderdon Silica Sand Discretionary Occurrence
Imperial No.775 Sandwich South 10-12 MDI40J02NW00006 Sandwich Silica Sand Discretionary Occurrence
Imperial Oil No. 560-Sombra 2-12 MDI40J09NW00003 Sombra Salt Discretionary Occurrence
Imperial Oil No.404 - W. Moore No.1 MDI40J16NW00009 Sarnia Salt Discretionary Occurrence
Imperial Oil No.555 - Moore 21-12 MDI40J16NW00014 Moore Salt Discretionary Occurrence
Ioe S. Colchest. Colchester 1-2 MDI40J02SW00010 Colchester Silica Sand Discretionary Occurrence
Ioel Union Enniskillen 4-3-14 MDI40J16NE00004 Enniskillen Salt Discretionary Occurrence
K.R. Bosanquet 2-9-11 MDI40P04NW00004 Bosanquet Salt Discretionary Occurrence
Kearney Graphite Mine MDI31E11NE00004 Butt Graphite Developed Prospect With Reported Reserves or Resources
Kelly-Czerewko MDI31C12SE00119 Marmora Magnetite, Wollastonite Garnet (Nonmetals) Occurrence
Kenmac Chibougamau MDI31D16NE00165 Cardiff Uranium Thorium Prospect
Kincardine Salt Company - Brine Field MDI41A04NE00002 Kincardine Salt Past Producing Mine Without Reserves or Resources
Kirkham Graphite Property MDI31C10SE00023 Bedford Graphite Developed Prospect With Reported Reserves or Resources
Landfill Quarry MDI40G10NW00001 Pelee Island Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Lewis 23-King 1 Malden 59-Front MDI40J03SE00032 Malden Silica Sand Discretionary Occurrence
Lewis 25-King 3 Malden 59-7 MDI40J03SE00033 Malden Silica Sand Discretionary Occurrence
Logan 31 Conc. 3 MDI40P11SE00003 Logan Gypsum Discretionary Occurrence
Macassa MDI31C13SE00099 Limerick Copper, Nickel Cobalt, Gold, Silver, Zinc Developed Prospect With Reported Reserves or Resources
Marmoraton MDI31C05NE00014 Marmora Iron Past Producing Mine With Reserves or Resources
Martel Mine MDI31F07SE00013 Bagot Iron Vanadium Prospect
Martin Quarry MDI30M12NW00009 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Matthews Mine MDI31C09NW00009 North Crosby Magnetite, Vanadium Titanium Past Producing Mine With Reserves or Resources
McClure Union - Enniskillen 7-4-11 MDI40J16NE00007 Enniskillen Salt Discretionary Occurrence
McLaren Depot MDI31C15NE00040 Palmerston Marble (Building Stone), Marble (high purity/flux) Past Producing Mine Without Reserves or Resources
Mell-Quirke (Barton) Occurrence MDI31F04NE00067 Dungannon Uranium Thorium Prospect
Merritton Quarry MDI30M03NE00003 Grantham Dolomite (Building Stone), Sandstone Past Producing Mine Without Reserves or Resources
Mesa - Plympton 1-4-5 MDI40J16NE00008 Plympton Salt Discretionary Occurrence
Methuen Township Ilmenite MDI31C12NW00114 Methuen Titanium Iron Developed Prospect With Reported Reserves or Resources
Mitchellville MDI31B05NW00006 Escott Copper Magnetite Prospect
Moira River Conservation Authority MDI31C12SE00115 Marmora Wollastonite Occurrence
Mono MDI31C12NE00195 Madoc Gold, Silver Arsenic, Bismuth, Copper, Tellurium, Zinc Developed Prospect With Reported Reserves or Resources
Morgan Stone Company Quarry MDI30M12SW00005 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Murray MDI31F14SE00020 Pembroke Mica Discretionary Occurrence
N.W. Malden Wood #1 MDI40J03SE00009 Malden Silica Sand Discretionary Occurrence
New Smithson Quarry MDI30M12NW00015 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Nicholson Quarry MDI40P16NE00002 Mono Sandstone Past Producing Mine Without Reserves or Resources
Nw Maldn. Synd. 1 Malden 53-5 MDI40J03SE00031 Malden Silica Sand Discretionary Occurrence
O'Shea-Warwick 1-12-5N MDI40P04SW00009 Warwick Salt Discretionary Occurrence
Ogs-W-3 MDI40J06SE00006 Sandwich Silica Sand Discretionary Occurrence
Oneida Twp. Quarry-2 MDI30L13NW00014 Oneida Sandstone Past Producing Mine Without Reserves or Resources
Ore Chimney MDI31C14SE00142 Barrie Gold, Silver Copper, Iron, Lead, Zinc Prospect
Owen Sound Stone - Orangeville Quarry MDI40P16NE00003 Mono Sandstone Past Producing Mine Without Reserves or Resources
P & H Husky Moore 2-13-8 MDI40J16NW00016 Moore Salt Discretionary Occurrence
P.H. and H. Colchester South 5-2-2 MDI40J02SW00013 Colchester Silica Sand Discretionary Occurrence
P.H. and H. Malden 3-41-4 MDI40J03SE00034 Malden Silica Sand Discretionary Occurrence
Parke MDI40J03SE00010 Malden Silica Sand Discretionary Occurrence
Pay Rock MDI31C14SE00148 Barrie Gold Occurrence
Pelee Island Quarry MDI40G15SE00004 Pelee Island Limestone (Crushed Stones) Producing Mine
Picamine MDI31C15NE00064 Palmerston Copper, Gold Silver Occurrence
Place-Frn. Petrl Malden Cd-Gr MDI40J03SE00035 Malden Silica Sand Discretionary Occurrence
Pole Star MDI31D09NE00042 Burleigh Uranium Prospect
Radenhurst and Caldwell MDI31F02NE00012 Lavant Iron Developed Prospect With Reported Reserves or Resources
Radnor Mine MDI31F06NE00017 Grattan Magnetite Past Producing Mine With Reserves or Resources
Ram MDI31C15NE00008 Palmerston Talc, Tremolite Mica Developed Prospect With Reported Reserves or Resources
Ram MDI31C10NW00117 Olden Wollastonite Prospect
Ram No.45 Malden 4-93-8 MDI40J02SW00014 Malden Silica Sand Discretionary Occurrence
Rankin Deposit MDI31F04SE00016 Mayo Iron Developed Prospect With Reported Reserves or Resources
Rare Earth Mines # 1 and #2 MDI31D16NW00195 Monmouth Uranium Rare Earth Elements, Thorium Developed Prospect With Reported Reserves or Resources
Rice and McHarg Quarry MDI30M12NW00011 Esquesing Sandstone Producing Mine
Robertsville MDI31C15NE00005 Palmerston Magnetite Past Producing Mine Without Reserves or Resources
Roth No.71-Haist No.1 MDI40P04SE00007 Williams Salt Discretionary Occurrence
S. Skelin Quarry-2 MDI30M12NW00012 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Salerno Zone MDI000000001804 Cavendish Graphite Prospect
Scudder West MDI40G15SE00007 Pelee Island Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Seaforth Brine Field MDI40P11SW00002 Tuckersmith Salt Occurrence
Silver Crater MDI31E01SE00248 Faraday Uranium Thorium Prospect
Silver Prospect MDI31C12SE00443 Marmora Silver Lead Occurrence
Simon Copper Property MDI31F03NW00044 Lyndoch Copper, Zinc Developed Prospect With Reported Reserves or Resources
Smith-Big Creek 1 Malden 56-4 MDI40J03SE00036 Malden Silica Sand Discretionary Occurrence
South Malone MDI31C12SE00218 Marmora Gold Discretionary Occurrence
South of Dempsey's Lake MDI31F07SE00088 Bagot Sulphur/Pyrite Discretionary Occurrence
St.Charles MDI31C13SE00014 Tudor Magnetite Past Producing Mine Without Reserves or Resources
Stapleton - Clinton Brine Field MDI40P12SE00003 Tuckersmith Salt Past Producing Mine Without Reserves or Resources
Structural Sandstone Quarry MDI30M12NW00014 Esquesing Dolostone, Sandstone Past Producing Mine Without Reserves or Resources
Sucker Lake Occurrences MDI31C15SE00090 South Sherbrooke Garnet (Nonmetals) Discretionary Occurrence
Summit Lake MDI31F02SW00032 South Canonto Aggregate, Magnetite Producing Mine
Sunburst GB # 7-McGillivray 41-N.B. MDI40P04NE00007 McGillivray Salt Discretionary Occurrence
Timbers Sandstone Quarry MDI30M12SW00016 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Timminco Metals MDI31F10SE00002 Ross Calcium, Dolomite (Metals), Magnesium Marble (Building Stone) Past Producing Mine With Reserves or Resources
Tobermory 230 MDI41H05SE00003 St. Edmunds Dolomite (Structural Material) Discretionary Occurrence
Tomahawk MDI31C12NW00002 Lake Iron Copper, Talc Developed Prospect Without Reported Reserves or Resources
Uhtoff-Orillia Twp. DH 6 MDI31D11NW00011 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Uhtoff-Orillia Twp. DH-10 MDI31D12NE00005 Orillia Limestone (Chemical/Flux) Discretionary Occurrence
Union 36 Enniskillen 4-1-7 MDI40J16NE00005 Enniskillen Salt Discretionary Occurrence
Union Gas - Moore No.18 - G&M Boyle No.1 MDI40J16NW00013 Moore Salt Discretionary Occurrence
Union Gas 32-Powell No.1 MDI40J09NE00002 Zone Salt Discretionary Occurrence
Union Gas-Enniskillen No.9-E.McLean No.1 MDI40J16SW00006 Moore Salt Discretionary Occurrence
Victoria Mine MDI31D15SE00098 Snowdon Magnetite Prospect
Volcanic G&O F1 Colchester South MDI40J02SW00015 Colchester Silica Sand Discretionary Occurrence
Warwick Brine Field MDI40I13NW00002 Warwick Salt Past Producing Mine Without Reserves or Resources
Wilbur MDI31F02SE00009 Lavant Iron Developed Prospect Without Reported Reserves or Resources
William R Barnes Co.-Halton Hills Quarry MDI30M12SW00013 Esquesing Sandstone, Sandstone (Silica) Past Producing Mine Without Reserves or Resources
William R Barnes Company - Milton Quarry MDI30M12SW00014 Nassagaweya Sandstone (Silica) Developed Prospect Without Reported Reserves or Resources
Williams Iron Deposit MDI31F07SW00027 Bagot Iron Prospect
Yuil MDI31F01NE00010 Ramsay Marble (Structural Material) Discretionary Occurrence
Yuill MDI31F02NE00009 Darling Magnetite Prospect
Zenmac MDI31D09NE00033 Anstruther Uranium Thorium Developed Prospect With Reported Reserves or Resources

Property Visits
Company Property Township or Area Commodity Comments


For further information contact the Southern Ontario District Resident Geologist Office

Updated June 2025