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Ontario Geological Survey

Mineral-Related Activity in the Southern Ontario Resident Geologist District
between January 2025 and December 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
Aaron Lundrigan 20000023345
Cardiff Geological Survey / Mapping, Prospecting By Licence Holder
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 Air Photo and Remote Imagery Interpretations, Geological Survey / Mapping, LiDAR, Prospecting By Licence Holder
David J Ross 20000023294
Cavendish, Galway Assaying and Analyses, Prospecting By Licence Holder, Rock Sampling, Soil/Till Sampling
David John Ross York River Claims Egan Chute Area 20000023274
Dungannon 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
Hart Geoscience Inc The Rustyshoe Property 20000023178
Glamorgan Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Ilir Loka Blairton Mine Project 20000023308
Belmont Geological Survey / Mapping, Prospecting By Licence Holder, Rock Sampling
Ilir Loka Crowe Lake Project 20000023296
Marmora Assaying and Analyses, Geological Survey / Mapping, Prospecting By Licence Holder
Ilir Loka 20000023290
Kennebec Assaying and Analyses, 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
Neil Lefebvre Mississagagon Lake Claim 20000023272
Barrie Geological Survey / Mapping, Prospecting By Licence Holder, Soil/Till Sampling
Skead Holdings Ltd Cardiff Rare Earth Element Project 20000022816
Cardiff Assaying and Analyses, Channel Sampling, Geological Survey / Mapping, Overburden Stripping, 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
20000023328
Methuen Environmental Studies

Mineral Inventory Updates
Deposit Name MDI Identifier Township or Area Primary Commodity Secondary Commodity Mineral Deposit Status
A & A Natural Stone Ltd./ A&A Quarry MDI41A11NE00009 Keppel Dolomite (Building Stone) Producing Mine
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
Adroit B Zone MDI000000000559 Denbigh Copper, Zinc Prospect
Alfred Quarry #1 MDI31G10SW00008 Alfred Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Alfred Quarry #2 MDI31G10SW00009 Alfred Limestone (Building Stone) Past Producing Mine Without 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), Sandstone (Silica) Producing Mine
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
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
Bertrand MDI31G07SW00004 Plantagenet Limestone (Crushed Stones) Producing Mine
Big Creek 3 MDI40J03SE00003 Malden Silica Sand Discretionary Occurrence
Black Lake MDI31C10SE00026 Bedford Magnetite Past Producing Mine Without 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 Quarry MDI31C12NW00006 Methuen Nepheline Syenite Magnetite Producing Mine
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
Boucher Point MDI41A10SE00003 Collingwood Shale (Structural Material) Developed Prospect Without Reported Reserves or Resources
Bourget MDI31G06NE00005 Clarence Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Brent Property MDI31L01SW00004 Deacon Mica Prospect
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
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
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 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
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
Carnarvon MDI31E02SE00007 Minden Marble (Structural Material) Occurrence
Casselman MDI31G06SE00004 Cambridge Limestone (Building Stone), Limestone (Crushed Stones) Occurrence
Centrefield Quarry MDI31G11SE00007 Plantagenet Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Charles Lake Quarry MDI41A14SE00006 Keppel Dolomite (Building Stone) Past Producing Mine Without Reserves or Resources
Charlotteville 18 Conc. V MDI40I16SW00003 Charlotteville Gypsum Discretionary Occurrence
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
Clarence Township MDI31G11SW00009 Clarence Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Cloutier-Grenon MDI31G06SE00014 Plantagenet Limestone (Building Stone) Occurrence
Coe MDI31C07NE00020 Loughborough Phosphate Mica Developed Prospect Without Reported Reserves or Resources
Cohoon Quarry MDI30M12NW00005 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Collingwood MDI41A09SW00002 Collingwood Oil Shale Prospect
Colonial Malden 4-42-4 MDI40J03SE00016 Malden Silica Sand Discretionary Occurrence
Colwell Grove MDI40J03SE00004 Malden Silica Sand Discretionary Occurrence
Comet Quartz Mine MDI31E09SE00004 Murchison Feldspar (Nonmetals), Mineral Specimen, Silica Cesium, Niobium, Rare Earth Elements, Zircon Prospect
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
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
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
E.C. King Contracting-Sydenham Quarry MDI41A10SW00008 Sydenham Dolostone Dolomite (Structural Material) Producing Mine
East Cemetery MDI31C11SW00049 Elzevir Soapstone, Talc Discretionary Occurrence
Ecole St Joseph MDI31G10SW00012 Alfred Limestone (Building Stone) 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 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
G. Coultis and Son Ltd - Thedford Q MDI40P04NW00003 Bosanquet Shale (Structural Material) Developed Prospect Without 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
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
Goderich Brine Field MDI40P12NE00003 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
H.C. Bellew MDI31C16SW00027 Burgess Barite Developed Prospect Without 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 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
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
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 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
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
Landfill Quarry MDI40G10NW00001 Pelee Island Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Leroux MDI31G07NW00002 Caledonia Limestone (Building Stone) Producing Mine
Lett Quarry MDI31G10SW00005 Alfred Limestone (Building Stone) Occurrence
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
ML North Claims MDI000000001281 Raglan Cobalt, Copper, Nickel, Palladium, Platinum 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
Mangrove Bay L8W showing MDI31F04NE00091 Raglan Chromium Copper, Nickel, Platinum Discretionary Occurrence
Marsh MDI41A11SE00005 Keppel Marl Past Producing Mine Without Reserves or Resources
Martin Quarry MDI30M12NW00009 Esquesing Sandstone Past Producing Mine Without Reserves or Resources
Martin Quarry MDI31G07SW00005 Roxborough Limestone (Building Stone) Producing Mine
Massanoga Labradorite MDI31C14NW00015 Effingham Feldspar (Gemstones) Discretionary Occurrence
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
McNab Lake MDI41A11NE00006 Keppel Marl Past Producing Mine Without Reserves or Resources
Meaford Tile Quarry MDI41A10SE00002 St. Vincent Shale (Structural Material) Past Producing Mine Without Reserves or Resources
Meany Mine MDI31F06NE00006 Sebastopol Apatite (Gemstones), Mineral Specimen 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
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
Nobles Bay Mine MDI31C16SE00004 Burgess Apatite (Gemstones), Mica Rare Earth Elements Developed Prospect Without Reported 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 Platinum Sample 0261 MDI31C14SW00062 Grimsthorpe Platinum Copper Discretionary Occurrence
OMYA Blue quarry MDI31F01NW00010 Darling Marble (Building Stone) Developed Prospect With Reported Reserves or Resources
Ogs Drill Hole Kp-24 MDI40J16SW00005 Moore Oil Shale Discretionary Occurrence
Ogs Drill Hole Kp-29 MDI40O01SE00003 Plympton Oil Shale Discretionary Occurrence
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
Owen Sound - West Quarry MDI41A10SW00006 Sarawak Dolomite (Building Stone) Past Producing Mine Without Reserves or Resources
Owen Sound Ledgerock - Owen Sound (Cruickshank) Quarry MDI41A11NE00002 Keppel Dolomite (Building Stone) Producing Mine
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
Patton Farm MDI40J03SE00011 Malden Sandstone (Silica) 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
Playfair Mine MDI31C16NW00002 Dalhousie Iron Developed Prospect Without Reported Reserves or Resources
Portland Graphite MDI31C16SE00040 Bastard Graphite Developed Prospect With Reported Reserves or Resources
Presley MDI31G11SE00009 Clarence Limestone (Crushed Stones) Occurrence
Presqu'Ile Point MDI30N13NE00005 Cramahe Fossil Specimen Discretionary Occurrence
Quarry 4 MDI31C12NW00088 Methuen Gneiss Past Producing Mine Without Reserves or Resources
Quigley Hill MDI31G11SW00005 Cumberland Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Ram No.45 Malden 4-93-8 MDI40J02SW00014 Malden Silica Sand Discretionary Occurrence
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
Rideau Mining Company MDI31C16SE00003 Burgess Mica, Phosphate Developed Prospect Without Reported Reserves or Resources
Ridgeway MDI31C12SW00122 Marmora Copper, Iron, Titanium Occurrence
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
Rollway Quarry MDI31G11SE00006 Plantagenet Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Rose Quarry MDI31G06SE00006 Plantagenet Limestone (Crushed Stones) Occurrence
Ross Gold MDI31C12SE00112 Marmora Gold 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
Shallow Lake MDI41A11SE00004 Keppel Clay, Marl Past Producing Mine Without Reserves or Resources
Shallow Lake Quarry MDI41A11SE00008 Keppel Dolomite (Building Stone) Past Producing Mine Without Reserves or Resources
Sharbot Lake MDI31C10NW00247 Olden Cobalt, Copper, Nickel Occurrence
Shorts MDI31C14SE00132 Kennebec Gold Occurrence
Silver Prospect MDI31C12SE00443 Marmora Silver Lead Occurrence
Silver Queen Mines MDI31C16SW00020 Burgess Feldspar (Nonmetals), Mica, Phosphate Wollastonite Developed Prospect Without Reported Reserves or Resources
Simon Copper North MDI000000001279 Lyndoch Cobalt, Copper Zinc Occurrence
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
South Malone MDI31C12SE00218 Marmora Gold Discretionary Occurrence
South Nation Provincial Park Quarry MDI31G11SE00005 Plantagenet Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
South of Dempsey's Lake MDI31F07SE00088 Bagot Sulphur/Pyrite Discretionary Occurrence
St. Lawrence Quarry MDI31C08NW00058 Leeds Wollastonite Granite (Structural Material) Producing Mine
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
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
Taylor MDI31C10NW00375 Olden Palladium, Platinum Discretionary Occurrence
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
Tobermory prospect MDI41H05SE00003 St. Edmunds Dolomite (Flux/Filler) Occurrence
Tomahawk MDI31C12NW00002 Lake Iron Copper, Talc Developed Prospect Without Reported Reserves or Resources
Tomlinson MDI31G05SW00024 Nepean Limestone (Crushed Stones) Producing Mine
Tomlinson Quarry MDI31G06SW00003 Osgoode Limestone (Building Stone) Past Producing Mine Without Reserves or Resources
Treadwell Quarry MDI31G11SE00004 Plantagenet Limestone (Crushed Stones) Past Producing Mine Without Reserves or Resources
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
Vineland Quarry MDI30M03NW00004 Clinton Dolostone Zinc Occurrence
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
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
Whinney Quarry MDI31G11SE00008 Plantagenet Limestone (Building Stone) Occurrence
White Marble MDI000000004459 Matawatchan Marble (High Purity/Flux) Occurrence
Wiarton Marsh MDI41A11NE00007 Keppel Marl Clay Past Producing Mine Without Reserves or Resources
Wilder Lake MDI41A02NE00002 Egremont Marl Prospect
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 Lake MDI41A07NW00002 Holland Clay, Marl Prospect
Windsor 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
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.
Dufferin West Marmora Iron Site investigation by Mine Rehab and SO RGP Tweed to determine rehab priority level. This site has been referred to as "Maloney" in previous reporting and AMIS, but seems to be the lateral extension of Dufferin mine workings.
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 Occurrence 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 January 2026