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Ontario Geological Survey

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


Mining and Exploration Activity
CompanyProperty Township or Area Commodity Work Type
Canadian WollastoniteSt Lawrence MineLeeds, PittsburghWollastoniteAgreement, Operational Update

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
CJP Exploration Inc Biron Bay Project 20000022828
Anstruther Assaying and Analyses, Miscellaneous Compilation and Interpretation
CJP Exploration Ltd Simon Copper Project 20000022972
Denbigh, Lyndoch Geological Survey / Mapping, LiDAR, Other, 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
Hart Geoscience Inc The Rustyshoe Property 20000023178
Glamorgan Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Jordan Clements Hardie Claim Group 20000023076
Barrie, Clarendon Assaying and Analyses, Channel Sampling, Drill Core Resampling, Miscellaneous Compilation and Interpretation, Overburden Stripping, Prospecting By Licence Holder, Rock Sampling
Jordan Clements Marble Lake Claim 20000022618
Barrie Geological Survey / Mapping, Manual Labour, Prospecting By Licence Holder, Rock Sampling
Michael Gordon Dark Star Claim 20000022991
Monmouth Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Municipality of Highlands East Salerno Claim 20000023102
Glamorgan Geological Survey / Mapping, Prospecting By Licence Holder
Skead Holdings Ltd Cardiff Rare Earth Element Project 20000022816
Cardiff Assaying and Analyses, Channel Sampling, Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Skead Holdings Ltd 20000022685
Cardiff, Monmouth Assaying and Analyses
Skead Holdings Ltd 20000022686
Lavant Assaying and Analyses
Trigan Resources Inc West Gabbro Project 20000022805
Methuen Environmental Studies

Mineral Inventory Updates
Deposit Name MDI Identifier Township or Area Primary Commodity Secondary Commodity Mineral Deposit Status
Ackerman MDI31C05NE00018 Marmora Gold Developed Prospect Without Reported Reserves or Resources
Actinolite Quarries MDI31C11SW00063 Elzevir Marble (Building Stone) Past Producing Mine Without Reserves or Resources
Addington Mine MDI31C11NE00010 Kaladar Gold Copper, Silver, Tungsten Past Producing Mine With Reserves or Resources
Adroit B Zone MDI000000000559 Denbigh Copper, Zinc Prospect
Allanhurst Mine MDI31F03SW00002 Denbigh Graphite Prospect
Allied Chem G-4 Anderdon 35-1 MDI40J03NE00005 Anderdon Silica Sand Discretionary Occurrence
Atlin-Ruffner MDI31E01SE00237 Cardiff Cerium, Fluorite, Lanthanum, Neodymium, Thorium, Uranium, Yttrium Prospect
Austin Corners Quarry MDI30M12NW00006 Esquesing Sandstone Occurrence
B.A. No.23-Warwick 22-6n MDI40P04SW00010 Warwick Salt Discretionary Occurrence
Baker Brothers MDI31G06SE00011 Cambridge Clay Occurrence
Bannockburn MDI31C12NE00021 Madoc Gold Developed Prospect With Reported Reserves or Resources
Bannockburn Pyrite Mine MDI31C12NE00019 Madoc Iron, Sulphur/Pyrite Past Producing Mine Without Reserves or Resources
Barry MDI31G10SE00013 West Hawkesbury Limestone (Crushed Stones) Past Producing Mine Without Reserves or Resources
Barryvale MDI31F07SE00031 Bagot Limestone (Building Stone) Limestone (Chemical/Flux) Occurrence
Bells Corners North MDI31G05SW00025 Nepean Sandstone Occurrence
Bells Corners Silica MDI31G05SW00003 Nepean Sandstone (Silica) Sandstone Developed Prospect With Reported Reserves or Resources
Belmont Calcite MDI31C12SW00011 Belmont Marble (High Purity/Flux) Developed Prospect With Reported Reserves or Resources
Belmont Iron MDI31C12SW00004 Belmont Magnetite Developed Prospect With Reported Reserves or Resources
Bertrand MDI31G07SW00004 Plantagenet Limestone (Crushed Stones) Producing Mine
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 3 MDI40J03SE00003 Malden Silica Sand Discretionary Occurrence
Black Lake MDI31C10SE00026 Bedford Magnetite Past Producing Mine Without Reserves or Resources
Blairton MDI31C05NW00026 Belmont Magnetite Past Producing Mine With Reserves or Resources
Blakely MDI31C11SW00018 Madoc Sulphur/Pyrite Copper, Zinc Past Producing Mine Without Reserves or Resources
Blithfield Prospect MDI31F07SE00066 Blithfield Magnetite Titanium Occurrence
Blue Mountain MDI31C12NW00006 Methuen Magnetite, Nepheline Syenite Producing Mine
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
Boegel MDI31C14SE00117 Kennebec Gold Occurrence
Border MDI31D10SE00013 Harvey Chert, Marble (Structural Material) Discretionary Occurrence
Bordun MDI31F02SW00027 South Canonto Neodymium, Praseodymium, Rare Earth Elements, Thorium, Uranium, Yttrium Occurrence
Bourget MDI31G06NE00005 Clarence Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Brown-Rabidoux 1 Malden 80-7 MDI40J03SE00015 Malden Silica Sand Discretionary Occurrence
Browns Lime Works - Owen Sound Quarry MDI41A10SW00005 Derby Dolomite (Structural Material) Past Producing Mine Without Reserves or Resources
Bruce Farm MDI31G05SW00019 Nepean Limestone (Building Stone) 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
Byron Bay MDI31D16SE00064 Anstruther Iron Developed Prospect Without Reported Reserves or Resources
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 # 1 Mine MDI30M04SW00006 Seneca Gypsum Past Producing Mine Without Reserves or Resources
Caledonia #2 Mine MDI30M04SW00007 Seneca Gypsum Past Producing Mine Without Reserves or Resources
Caledonia #3 Mine MDI30M04SW00008 Seneca Gypsum Past Producing Mine With Reserves or Resources
Caledonia Gypsum Co. MDI30M04SW00010 Seneca Gypsum Past Producing Mine Without Reserves or Resources
Campbell Sandstone Quarries MDI31G05SW00018 Nepean Sandstone Prospect
Canaan MDI31G06NW00002 Clarence Limestone (Crushed Stones) Producing Mine
Canaan Quarry MDI31G06NW00008 Cumberland Limestone (Building Stone) Producing Mine
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
Canada Talc Mine MDI31C11SW00031 Huntingdon Talc Dolomite (Flux/Filler), Tremolite Past Producing Mine With Reserves or Resources
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 Wollastonite St. Lawrence Deposit MDI31C08NW00058 Leeds Wollastonite Granite (Structural Material) Producing Mine
Carmeuse Lime (Beachville) Ltd- Centre Q MDI40P02SW00003 Oxford (On Thames) Limestone (Chemical/Flux) Producing Mine
Carnarvon MDI31E02SE00007 Minden Marble (Structural Material) Occurrence
Casselman MDI31G06SE00004 Cambridge Limestone (Building Stone), Limestone (Crushed Stones) Occurrence
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
Christie Lake Mine Occurrence MDI31C16SW00142 South Sherbrooke Iron, Nickel Cobalt, Copper, Gold, Silver, Thorium, Titanium, Uranium, Vanadium, Zinc Occurrence
Clarence Creek MDI31G06NE00002 Clarence Limestone (Building Stone), Limestone (Crushed Stones) Past Producing Mine Without Reserves or Resources
Cloutier-Grenon MDI31G06SE00014 Plantagenet Limestone (Building Stone) Occurrence
Clyde Forks MDI31F02SE00064 Lavant Antimony, Copper, Mercury, Silver Arsenic, Barite, Bismuth Prospect
Coe Hill MDI31C13SW00010 Wollaston Iron Developed Prospect Without Reported Reserves or Resources
Cohoon Quarry MDI30M12NW00005 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Colonial Malden 4-42-4 MDI40J03SE00016 Malden Silica Sand Discretionary Occurrence
Colwell Grove MDI40J03SE00004 Malden Silica Sand Discretionary Occurrence
Conley MDI31C11SW00032 Huntingdon Marble (Building Stone), Talc Past Producing Mine With Reserves or Resources
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 MDI31C11NW00023 Madoc Soapstone, Talc Developed Prospect With Reported Reserves or Resources
Cordova MDI31C12SW00005 Belmont Gold Past Producing Mine With Reserves or Resources
Cordova Mines Vansickle Road MDI31C12SW00129 Belmont Iron Titanium Occurrence
Cornwall Gravel MDI31G06NW00009 Cumberland Limestone (Crushed Stones) Producing Mine
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
Craigmont Mine MDI31F05SE00006 Raglan Corundum Molybdenum, Thorium, Uranium Past Producing Mine With Reserves or Resources
Cripple Creek Flagstone MDI000000001284 McCraney Gneiss Prospect
Crosby Silica Deposit (Area B) MDI31C09NE00028 South Crosby Sandstone (Silica), Silica Sand Developed Prospect With Reported Reserves or Resources
Cwp-Flemont 2 Malden 62-7 MDI40J03SE00021 Malden Silica Sand Discretionary Occurrence
Deer Lake MDI31C12SW00093 Belmont Iron, Zinc Copper Occurrence
Dingman MDI31C12SE00040 Marmora Gold Developed Prospect With Reported Reserves or Resources
Dome MDI31C14SE00134 Kennebec Gold Copper, Lead Occurrence
Dome Storage C Snadwich West 59-1 MDI40J06SE00007 Sandwich Silica Sand Discretionary Occurrence
Domtar MDI31G06SW00004 Russell Shale (Building Stone) Producing Mine
Donnolly MDI31C15SE00085 Oso Marble (Building Stone) 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
Dufferin MDI31C12SE00249 Madoc Iron Developed Prospect Without Reported Reserves or Resources
Dunvegan Quarry MDI31G07SW00003 Kenyon Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Dupel MDI31E02SW00004 Hindon Copper Occurrence
Duval Quarry MDI31G07SW00002 Kenyon Limestone (Building Stone) Producing Mine
East Cemetery MDI31C11SW00049 Elzevir Soapstone, Talc Discretionary Occurrence
Eldorado Copper MDI31C12SE00022 Madoc Copper, Iron Cobalt, Gold, Nickel, Silver Developed Prospect Without Reported Reserves or Resources
Elliot Point Farm MDI40J03SE00006 Malden Silica Sand Discretionary Occurrence
Embrun Quarry MDI31G06SW00006 Russell Limestone (Building Stone) Producing Mine
Emery MDI31C14SE00136 Kennebec Gold Lead, Zinc Prospect
Empire B Zone MDI31D16NE00146 Monmouth Uranium, Yttrium Fluorite, Thorium Developed Prospect With Reported Reserves or Resources
Empire Oil and Minerals Inc MDI31D16NE00266 Monmouth Thorium, Uranium Prospect
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
Fallowfield Quarry MDI31G05SW00021 Nepean Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Farcroft MDI31D16SE00059 Anstruther Uranium Prospect
Fission MDI31E01SE00235 Cardiff Fluorite, Uranium Thorium Prospect
Frontenac MDI31C07NE00036 Loughborough Lead Gold, Silver, Zinc Developed Prospect With Reported Reserves or Resources
Gagnier MDI31G07NE00006 Clarence Limestone (Building Stone) Occurrence
Gagnon Quarry MDI31G06SE00007 Russell Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Garland MDI31D16SW00093 Anstruther Uranium Thorium Prospect
Gateford MDI31C11NW00050 Madoc Gold Copper, Lead, Silver, Talc, Zinc Developed Prospect Without Reported Reserves or Resources
Gauthier Quarry MDI31G07NW00003 Caledonia Limestone (Building Stone) Prospect
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
Georgetown Quarry MDI30M12NW00022 Esquesing Dolostone Past Producing Mine Without Reserves or Resources
Glen Andrew MDI31G07NE00002 East Hawkesbury Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Glen Robertson MDI31G08SW00002 Lochiel Limestone (Chemical/Flux) Occurrence
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 Mine MDI40P12NE00005 Goderich Salt Producing Mine
Goderich Salt Company Brine Field MDI40P13SE00002 Colborne Salt Past Producing Mine Without Reserves or Resources
Green Lake MDI31F02NE00060 Darling Antimony, Gold Copper, Silver Occurrence
Green Lane MDI31G10SE00003 West Hawkesbury Limestone (Building Stone), Limestone (Chemical/Flux) 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
Hagersville Mine MDI40P01SE00002 Oneida Gypsum Producing Mine
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
Harcourt Graphite Mine MDI31E01SE00021 Cardiff Gold, Graphite Silver Developed Prospect With Reported Reserves or Resources
Hardie MDI31C14SE00042 Barrie Antimony, Copper, Gold, Silver, Zinc Lead Prospect
Harmon - Moore 8-9-11 MDI40J16NW00019 Moore Salt Discretionary Occurrence
Harvest Pet.Ihs Colchestersouth 76-Front MDI40J02SW00006 Colchester Silica Sand Discretionary Occurrence
Hastville MDI31C12SE00037 Marmora Marble (Structural Material) Past Producing Mine Without Reserves or Resources
Higginson Quarry MDI31G10SE00007 West Hawkesbury Sandstone Past Producing Mine Without Reserves or Resources
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
Hobson-Nelson-Knob Mines MDI31C12SE00020 Madoc Iron Zinc Prospect
Homestake MDI31F02NE00036 Lavant Antimony, Copper, Gold Occurrence
Howes MDI31G10NE00002 Longueuil Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Howland Mine MDI31D15SE00096 Snowdon Magnetite Past Producing Mine Without Reserves or Resources
Hunt Mine MDI31F07SW00016 Brougham Molybdenum Prospect
Hwy 7 Marble MDI31C11SW00037 Elzevir Marble (Building Stone), Marble (Structural Material) Marble (High Purity/Flux) Producing Mine
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 MDI31D16NW00263 Monmouth Uranium Prospect
Imperial Oil No. 560-Sombra 2-12 MDI40J09NW00003 Sombra Salt 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
International Quartz Fletcher Lake Property MDI31E07SW00012 McClintock Quartz Developed Prospect Without Reported Reserves or Resources
Ioe S. Colchest. Colchester 1-2 MDI40J02SW00010 Colchester Silica Sand Discretionary Occurrence
Ioel Union Enniskillen 4-3-14 MDI40J16NE00004 Enniskillen Salt Discretionary Occurrence
Iron Mine Bay MDI31D15SE00100 Galway Magnetite, Manganese Occurrence
Jock River Peat MDI31F01SE00015 Beckwith Peat Occurrence
Joes Lake MDI31F02SE00059 Lavant Antimony, Copper, Gold, Silver Arsenic, Bismuth, Mercury, Zinc 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
Kennebec MDI31C11NE00101 Kennebec Copper Occurrence
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
Koizumi MDI31C11SE00026 Kaladar Mica Prospect
L'Orignal MDI31G10SW00003 Longueuil Limestone (Building Stone), Limestone (Chemical/Flux), Limestone (Crushed Stones) Producing Mine
L. T. Chandler MDI31E01SE00197 Monmouth Uranium Fluorite, Thorium Prospect
Labradorite MDI31C14NW00016 Effingham Feldspar (Gemstones) Discretionary Occurrence
Lac-Homestake MDI31F02NE00104 Darling Copper, Gold Occurrence
Lafarge Canada Inc - Woodstock Quarry MDI40P02SW00002 Zorra Limestone (Chemical/Flux), Limestone (Crushed Stones) Producing Mine
Landfill Quarry MDI40G10NW00001 Pelee Island Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Ledyard MDI31C12SW00008 Belmont Gold Developed Prospect Without Reported Reserves or Resources
Leroux MDI31G07NW00002 Caledonia Limestone (Building Stone) Producing Mine
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
Limoges MDI31G06SE00003 Cambridge Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Lockwood Property MDI31C11SE00121 Elzevir Marble (Building Stone) Developed Prospect With Reported Reserves or Resources
Logan 31 Conc. 3 MDI40P11SE00003 Logan Gypsum Discretionary Occurrence
MacDonald Mine MDI31F04NW00023 Monteagle Feldspar (Nonmetals), Mineral Specimen, Niobium, Uranium Copper, Molybdenum, Rare Earth Elements, Thorium, Titanium, Zircon Developed Prospect Without Reported Reserves or Resources
MacLean MDI31G06NE00004 Clarence Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
MacPherson-Bragg MDI31C15SE00004 Olden Feldspar (Nonmetals) Discretionary Occurrence
Macassa MDI31C13SE00099 Limerick Copper, Nickel Cobalt, Gold, Silver, Zinc Developed Prospect With Reported Reserves or Resources
Madawaska MDI31F04SW00037 Faraday Thorium, Uranium Past Producing Mine With Reserves or Resources
Marmoraton MDI31C05NE00014 Marmora Iron, Rare Earth Elements Past Producing Mine With Reserves or Resources
Martel Mine MDI31F07SE00013 Bagot Iron Vanadium Prospect
Martin Quarry MDI31G07SW00005 Roxborough Limestone (Building Stone) Producing Mine
Martin Quarry MDI30M12NW00009 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Massanoga Labradorite MDI31C14NW00015 Effingham Feldspar (Gemstones) Discretionary Occurrence
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
McFarland MDI31G05SW00023 Nepean Limestone (Crushed Stones) Producing Mine
McLaren Depot MDI31C15NE00040 Palmerston Marble (Building Stone), Marble (High Purity/Flux) Past Producing Mine Without Reserves or Resources
Meadow Lake Zone MDI31C10SE00205 Bedford Graphite Developed Prospect With Reported Reserves or Resources
Mell-Quirke (Barton) Occurrence MDI31F04NE00067 Dungannon Uranium Thorium Prospect
Menard Quarry MDI31G06SW00005 Russell Limestone (Building Stone) Occurrence
Merkley Brothers MDI31G06SE00012 Cambridge Clay Occurrence
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
Miller MDI31C11SW00021 Madoc Iron Developed Prospect Without Reported Reserves or Resources
Mitchellville MDI31B05NW00006 Escott Copper Magnetite Prospect
Moira River Conservation Authority MDI31C12SE00115 Marmora Wollastonite Occurrence
Moira River Karst MDI31C06SW00022 Thurlow Fossil Specimen, Limestone (Building Stone) Discretionary Occurrence
Mono MDI31C12NE00195 Madoc Gold, Silver Arsenic, Bismuth, Copper, Tellurium, Zinc Developed Prospect With Reported Reserves or Resources
Monteagle Minerals MDI31F04NE00008 Monteagle Corundum, Nepheline Syenite Mica Developed Prospect Without Reported Reserves or Resources
Morgan Stone Company Quarry MDI30M12SW00005 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Mrs MacPhie MDI31G07NE00003 Lochiel Limestone (Building Stone) Occurrence
Murray MDI31F14SE00020 Pembroke Mica Discretionary Occurrence
N.W. Malden Wood #1 MDI40J03SE00009 Malden Silica Sand Discretionary Occurrence
Navan Pit and Quarry MDI31G06NW00005 Cumberland Limestone (Crushed Stones) Producing Mine
Nephton MDI31D09NE00006 Methuen Nepheline Syenite Past Producing Mine With Reserves or Resources
New Cavendish MDI31D09NW00086 Cavendish Thorium, Uranium Developed Prospect With Reported Reserves or Resources
New Smithson Quarry MDI30M12NW00015 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Nichols Lake MDI000000004458 Darling Gold Antimony, Copper, Silver Occurrence
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
OMYA Blue quarry MDI31F01NW00010 Darling Marble (Building Stone) Developed Prospect With Reported Reserves or Resources
Ogs-W-3 MDI40J06SE00006 Sandwich Silica Sand Discretionary Occurrence
Ojibway Mine MDI40J06SE00002 Sandwich Salt Producing Mine
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
Paddle Farm MDI31C08SW00004 Pittsburgh Sandstone (Silica) Past Producing Mine With Reserves or Resources
Paquette MDI31G07NW00005 Caledonia Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Park Reserve Outcrop MDI31F10SE00013 Ross Dolomite (Flux/Filler) Prospect
Parke MDI40J03SE00010 Malden Silica Sand Discretionary Occurrence
Pay Rock MDI31C14SE00148 Barrie Gold Occurrence
Peatland 31B-18 MDI31B13SW00004 Kitley Peat Discretionary Occurrence
Peatland 31C-621 MDI31C16NE00004 Drummond Peat Developed Prospect With Reported Reserves or Resources
Peatland 31C-623 MDI31C16NE00005 Drummond Peat Prospect
Peatland 31D-61 MDI31D15NE00004 Snowdon Peat Discretionary Occurrence
Pelee Island Quarry MDI40G15SE00004 Pelee Island Limestone (Crushed Stones) Producing Mine
Perth Peat Bog MDI31C16NW00003 Drummond Peat Developed Prospect With Reported Reserves or Resources
Pharaoh - Clyde River MDI31F01SW00033 Lanark Zinc Lead, Silver Occurrence
Picamine MDI31C15NE00064 Palmerston Copper, Gold Silver Occurrence
Pike Lake Mine MDI31C16SW00028 Burgess Mica, Vermiculite Past Producing Mine Without Reserves or Resources
Place-Frn. Petrl Malden Cd-Gr MDI40J03SE00035 Malden Silica Sand Discretionary Occurrence
Plantagenet Springs MDI31G10SW00002 Plantagenet Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Platinova Skarn MDI31C12SE00096 Marmora Wollastonite Developed Prospect With Reported Reserves or Resources
Pole Star MDI31D09NE00042 Burleigh Uranium Prospect
Portland Graphite MDI31C16SE00040 Bastard Graphite Developed Prospect With Reported Reserves or Resources
Presqu'Ile Point MDI30N13NE00005 Cramahe Fossil Specimen Discretionary Occurrence
Radenhurst and Caldwell MDI31F02NE00012 Lavant Iron Rare Earth Elements, Titanium Developed Prospect With Reported Reserves or Resources
Radnor Mine MDI31F06NE00017 Grattan Magnetite Past Producing Mine With 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
Rathwell Quarry MDI31G06NW00012 Cumberland Limestone (Crushed Stones) Producing Mine
Regis Resources MDI000000002458 Cavendish Vermiculite Graphite Past Producing Mine With Reserves or Resources
Reynolds Mine MDI31D09NW00026 Galway Nickel Sulphur/Pyrite Occurrence
Rice and McHarg Quarry MDI30M12NW00011 Esquesing Sandstone Producing Mine
Richardson MDI31C12SE00253 Madoc Gold Lanthanum, Neodymium, Thorium, Uranium, Ytterbium, Yttrium Prospect
Richier MDI31G06SE00005 Cambridge Limestone (Crushed Stones) Producing Mine
Rivington Quarry MDI31G06NW00013 Cumberland Limestone (Crushed Stones) Producing Mine
Road Cut MDI31C15SE00204 Olden Mineral Specimen Marble (Structural Material) Discretionary Occurrence
Road Side MDI31C10NW00089 Olden Granite Discretionary Occurrence
Robertsville MDI31C15NE00005 Palmerston Magnetite Past Producing Mine Without Reserves or Resources
Robinson MDI31C12SE00059 Madoc Gold Sulphur/Pyrite Occurrence
Rose Farm MDI31F10SW00040 Ross Molybdenum Feldspar (Nonmetals) Prospect
Rose Quarry MDI31G06SE00006 Plantagenet Limestone (Crushed Stones) Occurrence
Ross Quarry MDI31G10SE00004 East Hawkesbury Limestone (Building Stone), Limestone (Crushed Stones) Producing Mine
Roth No.71-Haist No.1 MDI40P04SE00007 Williams Salt Occurrence
S. Skelin Quarry-2 MDI30M12NW00012 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Salerno Lake MDI31D16SW00120 Snowdon Lead, Zinc Developed Prospect With Reported Reserves or Resources
Salerno Zone MDI000000001804 Cavendish Graphite Prospect
Salina Formation MDI40J16NW00017 Moore Salt Occurrence
Sarsfield Quarry MDI31G06NW00003 Cumberland Limestone (Crushed Stones) Producing Mine
Scudder West MDI40G15SE00007 Pelee Island Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Seaforth Brine Field MDI40P11SW00002 Tuckersmith Salt Occurrence
Sharbot Lake MDI31C10NW00247 Olden Cobalt, Copper, Nickel Platinum Metals, Sulphur/Pyrite Occurrence
Silver Crater MDI31E01SE00248 Faraday Uranium Thorium Prospect
Silver Prospect MDI31C12SE00443 Marmora Silver Lead Occurrence
Simon Copper North MDI000000001279 Lyndoch Cobalt, Copper Zinc Occurrence
Simon Copper Property MDI31F03NW00044 Lyndoch Copper, Zinc Iron, Selenium Developed Prospect With Reported Reserves or Resources
Simpson Lake MDI31F03NW00067 Ashby Dolomite (Building Stone), Dolomite (Structural Material) Producing Mine
Skewgaw MDI31C15SE00255 Olden Iron Discretionary Occurrence
Smith-Big Creek 1 Malden 56-4 MDI40J03SE00036 Malden Silica Sand Discretionary Occurrence
Smithson Quarry 1 MDI30M12NW00013 Chinguacousy Sandstone Past Producing Mine Without Reserves or Resources
Sophia MDI31C11SW00028 Madoc Gold, Silver Arsenic Developed Prospect Without Reported Reserves or Resources
South Malone MDI31C12SE00218 Marmora Gold Discretionary Occurrence
South of Dempsey's Lake MDI31F07SE00088 Bagot Sulphur/Pyrite Discretionary Occurrence
Spain Mine MDI31F06SE00013 Griffith Molybdenum Copper, Thorium, Uranium Developed Prospect With Reported Reserves or Resources
St.Charles MDI31C13SE00014 Tudor Magnetite Past Producing Mine Without Reserves or Resources
Stanleyville Vermiculite MDI31C16SW00030 Burgess Vermiculite Developed Prospect With Reported Reserves or Resources
Stapleton - Clinton Brine Field MDI40P12SE00003 Tuckersmith Salt Past Producing Mine Without Reserves or Resources
Stratheran Quarry MDI31G05SW00017 March Dolostone Occurrence
Structural Sandstone Quarry MDI30M12NW00014 Esquesing Dolostone, Sandstone Past Producing Mine Without Reserves or Resources
Sucker Lake Occurrences MDI31C15SE00090 South Sherbrooke Garnet (Nonmetals) Discretionary Occurrence
Sunburst GB # 7-McGillivray 41-N.B. MDI40P04NE00007 McGillivray Salt Occurrence
Tatlock Quarry MDI31F01NW00006 Darling Calcite, Marble (Building Stone), Marble (Structural Material) Producing Mine
Tibble Property MDI31C14NE00035 Clarendon Copper, Silver, Zinc Mica Occurrence
Tierney Quarry MDI31G10SW00004 Alfred Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
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
Timmins Mine MDI31C09NW00013 Burgess Graphite Copper, Iron, Nickel, Zinc Developed Prospect With Reported Reserves or Resources
Tobermory prospect MDI41H05SE00003 St. Edmunds Dolomite (Flux/Filler) Occurrence
Tomahawk MDI31C12NW00002 Lake Iron Copper, Talc Developed Prospect Without Reported Reserves or Resources
Tomclid Iron Mine MDI31F02SW00032 South Canonto Aggregate, Magnetite Producing Mine
Tomlinson MDI31G05SW00024 Nepean Limestone (Crushed Stones) Producing Mine
Tomlinson Quarry MDI31G06SW00003 Osgoode Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Triana Explorations MDI31C12NE00116 Tudor Copper, Nickel Gold Prospect
Trudeau Quarry MDI31C11SW00180 Hungerford Dolomite (Flux/Filler), Marble (High Purity/Flux) Past Producing Mine With Reserves or Resources
Tweed Marble Quarry MDI31C11SW00040 Hungerford Marble (Building Stone) Dolomite (Flux/Filler), Feldspar (Gemstones) Past Producing Mine With 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
United Reef MDI31C14SW00006 Anglesea Gold Occurrence
Vansickle Property MDI31C12SW00034 Methuen Marble (Structural Material), Silica Developed Prospect With Reported Reserves or Resources
Victoria Mine MDI31D15SE00098 Snowdon Magnetite Titanium Prospect
Volcanic G&O F1 Colchester South MDI40J02SW00015 Colchester Silica Sand Discretionary Occurrence
W.F. Bonter MDI31C12SE00036 Marmora Marble (High Purity/Flux), Marble (Structural Material) Past Producing Mine Without Reserves or Resources
Wallbridge MDI31C12SE00016 Madoc Iron Developed Prospect Without Reported Reserves or Resources
Warwick Brine Field MDI40I13NW00002 Warwick Salt Past Producing Mine Without Reserves or Resources
West Flinton Arsenopyrite MDI31C11NE00021 Kaladar Arsenic Discretionary Occurrence
West Harwood MDI31G05SW00016 March Clay Discretionary Occurrence
Westroc MDI40P02NE00002 Blenheim Gypsum Past Producing Mine With Reserves or Resources
White Marble MDI000000004459 Matawatchan Marble (High Purity/Flux) Occurrence
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
Windsor Salt Brine Field MDI40J06SE00004 Sandwich Salt Producing Mine
Woods Option MDI31C11SW00064 Elzevir Marble (High Purity/Flux), Marble (Structural Material) Occurrence
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
Zone A - Cruickshank Prospect MDI41A11SE00009 Keppel Dolomite (Building Stone) Prospect

Property Visits
Company Property Township or Area Commodity Comments
Covia Canada Ltd Blue Mountain Operations Methuen Nepheline Syenite SO RGP staff (RG, DG and summer student) joined University of Waterloo's GeoX program on a tour of Covia's Blue Mountain operations. The entire property was visited, included the inactive Nephton site and tailings, the Craig pit and magnetite waste pile, and the Blue Mountain quarry. Representative samples of the nepheline ore and the magnetite waste rock were collected.
Gawley No. 1 Marmora Gold Sit investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Wallbridge Iron Mine Madoc Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level. Site is completely filled in and flat. No evidence of a pit is left.
Hobson Iron Mine Madoc Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Maloney Mine Marmora Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Dufferin Madoc Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Triana Occurrence Tudor Copper, Nickel Visited by the SO DG and DGA. Trail access and the location of historical pits and trenches were located using LiDAR. Adjacent to the workings, one waste pile of mineralized, altered gabbro was located and sampled. Due to blowdown and overgrowth from recent storms in the area, the property is incredibly difficult to access, and the workings are almost completely obscured. Any further work would require brush clearing and trail cutting.
Neill Mine Marmora Gold Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Powell Mine Marmora Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.
Miller Iron Mine Madoc Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level. Two landscaped ponds are located on the former pit.
Blakely Madoc Sulphur/Pyrite Site tour by Mine Rehab with SO RGP Tweed. This site is full documented and ranked by Mine Rehab.
Richardson Gold Mine Madoc Gold The historic Richardson gold mine was visited by the SO DG, RG, and SEO student, guided by K. Payne. The various shafts, pits and workings were examined. The ruins of the historical mine processing plant (18 299674mE, 4940430mN) were visited as well. The property is on private land and is no longer open to the public, but many hazards remain insufficiently mitigated.
Barryvale Fe-Ti Blithfield Iron, Magnetite, Titanium Occurrence is accessible in a roadcut along the K&P Trail, south of Barryvale. Magnetite-ilmenite mineralization within the Jamieson diorite was sampled. Road access to other parts of the intrusion was explored as well.
Sophia Madoc Gold Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level.


For further information contact the Southern Ontario District Resident Geologist Office

Updated November 2025