Ontario Geological Survey
Permanent Link to this Record:
MDI42D16SW00020
| Record Name(s) | Geordie Lake - 1980, Ameranium - 1963, MacRae Showing - 1986, Joa Showing - 1986, Mathias Showing - 1986 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1980-Aug-19 |
| Date Last Modified | 2022-Apr-12 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Palladium, Platinum
Secondary Commodities: Silver, Titanium
Township or Area: Seeley Lake Area
Latitude: 48° 49' 8.08" Longitude: -86° 29' 6.28"
UTM Zone: 16 Easting: 537799 Northing: 5407453 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D16SW
Point Location Description: From AFRI 42D16SW2003
Location Method: Conversion from MDI
Access Description: Access to the Eastern Contact Zone mineralization is provided by a series of old logging roads, ATV trails, and foot paths that extend for a distance of approx. 9 km north (3.5 km straight-line distance) from Trans-Canada Highway 17, 1 km east of the Coldwell turnoff and 14 km NNW of Marathon.
1958-61: H.V. Tuominen and F.P. Puskas of the OGS mapped the Coldwell Complex at 1:31,680 scale. 1963-64: Ameranium Mines Ltd. staked claims conduct an exploration program including ground magnetometer and EM surveys, geological mapping, and trenching. 1980: K.L. Currie of the GSC mapped the complex at a 1:50,000 scale. 1985: Claims were staked by M. Joa, G. MacRae, R. Bush and J. Higgins. 1986: Prospecting rediscovered the Ameranium trench (renamed the MacRae showing) and discovered the Joa and Mathias showings. OGS geologists took samples. St. Joe Gold optioned the property late in the year 1987: St. Joe Gold commenced an exploration program, including linecutting, ground magnetometer and IP surveys, geological mapping and sampling, outcrop stripping, detailed mapping and channel sampling of the Mathias Occurrence and sampling along the eastern contact of the Geordie Lake Intrusion. St. Joe Gold signed a joint venture agreement with Giant Bay Resources Ltd. in Oct 1987 and the JV drilled 8 DDH totalling 773 m. 1988: Giant Bay backed out of the JV early in the year. St. Joe Gold contracted a UTEM survey, then dropped the option soon after. 1989: T. Mulja completed a M.Sc thesis focussing on the petrology and mineralization of the Eastern Contact Zone of the Geordie Lake Intrusion. 1993: D.J. Good of the OGS completed a detailed study of the MacRae/Mathias Occurrences and the Marathon Deposit. E.C. Walker of the OGS completed 1:20,000 scale mapping of the area. 1995: Claims staked by M. Joa, B. Fowler and M. Shuman. 1996: Owners completed limited linecutting, a beep map survey and 6 surface trenches. 1997: Totem Sciences Inc. optioned the property and contracted Dan Patrie Exploration Ltd. to conduct an IP survey. 1998: Gryphon Metals Corp. optioned the property from M. Joa, B. Fowler and M. Shuman and staked 3 new claims. 1999: Gryphon Metals Corp. optioned a 51% interest in the property to L.E.H. Ventures Ltd., who completed linecutting, mag survey, resampling of DDH core, prospecting and a soil geochemistry survey. 2000: L.E.H. Ventures drilled 2 DDH totalling 462 m. 2001: L.E.H. Ventures drilled 14 DDH totalling 2254.8 m. 2002: L.E.H. Ventures completed 4 DDH totalling 702.08 m. 2006: L.E.H. Ventures drilled 3 DDH totalling 1175.5 m. 2008: L.E.H. Ventures changed name to Discovery PGM Exploration Ltd. and drilled 2 DDH totalling 106 m. 2010: Discovery PGM conducted geological mapping, and drilled 21 holes totalling 2995.5 m. 2012: Discovery PGM was amalgamated into Stillwater Canada. 2017: Stillwater was acquired by Sibanye Gold Ltd. and renamed to Sibayne-Stillwater. 2019: Generation Mining Ltd. acquired a 51% interest in the property and released a resource estimate.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.50963 | 20000007091 | 20000007091 |
| 2.37682 | 20000003336 | 20000003336 |
| 2.20412 | 42D16SW2003 | 42D16SW2003 |
| 2.11743 | 42D16SE0020 | 42D16SE0020 |
| 53 | 42D16SW0015 | 42D16SW0015 |
| 2.11629 | 42D16SW0012 | 42D16SW0012 |
| 2.10245 | 42D16SW0028 | 42D16SW0028 |
| 2.17470 | 42D16SW0045 | 42D16SW0045 |
| 63.1275 | 42D16SW0087 | 42D16SW0087 |
| 2.28081 | 42D16SW2012 | 42D16SW2012 |
| 2.17212 | 42D16SW0034 | 42D16SW0034 |
| 2.47672 | 20000006218 | 20000006218 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Geological Age: Archean Geochronological Age: 1.1 Ga Geochron. Age Ref.: Heaman and Machado, 1987
Jan 09, 2015 (Therese Pettigrew) - The Geordie Lake property is underlain by syenitic and gabbroic rocks of Centre I of the late-Proterozoic-age Coldwell Alkaline Complex which intrudes and bisects the Neoarchean Schreiber-Hemlo greenstone belt and the southern margins of the Black-Pic Batholith of the Wawa Subprovince of the Superior Structural Province. The 25 km in diameter (580 square km), sub-circular, composite body is the largest alkaline intrusive complex in North America and is the southernmost member of a N-S trending belt of alkaline intrusions. The Coldwell Complex was emplaced during the early stages of the Middle Proterozoic mid-continent rifting event. The complex formed as the result of alkaline magmatism associated with 3 nested intrusive centres (Centres I through III) active during cauldron subsidence along major faults. The silica-saturated Centre I intrusions consist of the eastern and western border-group gabbros (the oldest units within the complex) and subsequent intrusions of ferroaugite syenite and syenite-syenodiorite. The Geordie Lake Intrusion, an elongated, 3000 m long, gabbroic and troctolitic body intrudes the Centre I syenites and hosts multiple, roughly N-S striking, texturally and compositionally heterogeneous zones of Cu-Pd-Ag-rich disseminated sulphides (AFRI 42D16SW2003). The eastern contact of the Geordie Lake intrusion is exposed on surface and dips 30-60 degrees towards the west (AFRI 42D16SW2012).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Bornite | Economic | Ore | ||||
| 4 | Covellite | Economic | Ore | ||||
| 5 | Chalcocite | Economic | Ore | ||||
| 6 | Ilmenite | Economic | Ore | ||||
| 7 | Magnetite | Economic | Ore | ||||
| 8 | Pyrite | Economic | Ore | ||||
| 9 | Millerite | Economic | Ore | ||||
| 10 | Cobaltite | Economic | Ore | ||||
| 12 | Siegenite | Economic | Ore | ||||
| 13 | Galena | Economic | Ore |
Apr 13, 2016 (Therese Pettigrew) - Drennan and Fell (2010) describe the Geordie Lake deposit as a poly-metallic, troctolite/ophitic gabbro intrusion with disseminations, blebs and veins of sulphide mineralization. The sulphides are enriched in Cu, Ni, Co, Pd, Pt, Au, Ag, Ti, Te and consist primarily of chalcopyrite with minor bornite, pyrite, millerite, cobaltite, siegentite, sphalerite, and galena. The most significant mineralization observed on the property includes the Mathias and MacRae showings and occurs along the Lower Contact Zone (formerly called the Eastern Contact Zone) within a gabbro body in a zone composed of 1-8% chalcopyrite, pyrrhotite, bornite, covellite and chalcocite. Eight to ten percent coarsely disseminated ilmenite and titaniferous magnetite also occurs within this zone. This Cu-Pd-Pt-Ag-Ti-rich sulphide zone has been mapped over 1500 m length and averages approximately 15 m in width. The mineralized zone occurs within a potassic-altered alkaline gabbro directly adjacent to a gabbro/quartz syenite contact, within the Coldwell Alkaline Complex. Analytical results received by St. Joe Gold in 1986 from 300 grab and channel samples show that Cu, Pt, Pd, Au, Ag, Fe and Ti all increase very dramatically near the eastern gabbro/syenite contact. OGS analyses of selected grab samples from the gabbroic rock with disseminated sulphides indicate values of up to 1.73% Cu, 394 ppm Ni, 110 ppb Pt, 2130 ppb Pd, 220 ppb Au and 7 ppm Ag. In the chalcopyrite-bornite-magnetite-rich stringers, values run as high as 32.3% Cu, 1050 ppm Ni, 4250 ppb Pt, 2775 ppb Pd, 1080 ppb Au and 112 ppm Ag. Drilling by the company in 1887 delineated a zone between 3 and 35 m wide. DDH7 intersected mineralization 12 m into the syenite, with the last 3 m running 0.63% Cu, 297 ppb Pd and 0.8 ppm Ag. Airborne magnetic surveys have traced the extent of the mineralized zone over a strike length of 2500 m (Patrie, 1997, AFRI 42D16SW0045). The best mineralization discovered to date occurs within the Eastern Contact Zone and includes the MacRae (Ameranium), Mathias, and Joa occurrences. This zone is between 5 and 40 m in thickness, has been traced on surface for apprx 2000 m, and is composed of 1-30$ coarsely disseminated chalcopyrite, with lesser amounts of bornite, pyrite, magnetite and supergene chalcocite. A wide variety of platinum-group minerals, base- and precious-metal tellurides, bismuthinides and alloys are associated with the disseminated grains of chalcopyrite. The subparallel sulphide zones located to the west are generally thinner, more diffuse and less regular than the Eastern Contact Zone and often contain fewer percentages of finer-grained sulphides. Most of the mineralization observed within the intrusion is primary magmatic in origin; however, structurally remobilized stringers and elongated pods of chalcopyrite-magnetite occur locally (AFRI 42D16SW2003).
Jan 09, 2015 (Therese Pettigrew) - The Geordie Lake Intrusion is generally unaltered to weakly altered with localized zones of strong to intense alteration. There is no apparent pattern to the alteration and the most intense alteration is not associated with the gabbro/syenite contact or the known mineralized zones. The alteration observed is possibly due to volatile-rich, late stage magmatic, deuteric fluids and not exotic hydrothermal fluids (AFRI 42D16SW2003).
| Rank | Classification |
|---|---|
| 1 | VMS Base Metal |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Geordie Pit | 2019 | Inferred Mineral Resource | 12899000 | Generation Mining Dec 2 2019 press release | $15 CAD cutoff; 212,000 oz Pd, 12,000 oz Pt, 14,000 oz Au, 80,000,000 lb Cu, 982,000 oz Ag | Copper 0.28 Percent, Gold 0.03 Grams per Tonne, Palladium 0.56 Grams per Tonne, Platinum 0.03 Grams per Tonne, Silver 2.4 Grams per Tonne |
| Geordie Pit | 2019 | Indicated Mineral Resource | 17268000 | Generation Mining Dec 2 2019 press release | $15 CAD cutoff; 312,000 oz Pd, 20,000 oz Pt, 25,000 oz Au, 133,000,000 lb Cu, 1,351,000 oz Ag | Copper 0.35 Percent, Gold 0.05 Grams per Tonne, Palladium 0.56 Grams per Tonne, Platinum 0.04 Grams per Tonne, Silver 2.4 Grams per Tonne |
| Geordie Lake Hangingwall Zone | 2010 | Inferred Mineral Resource | 600000 | 2010 NI 43-101 report | $13 CAD cutoff; 7,050 oz Pd, 570 oz Pt, 430 oz Au, 3,020,000 lb Cu, 37,590 oz Ag | Copper 0.23 Percent, Gold 0.02 Grams per Tonne, Palladium 0.60 Grams per Tonne, Platinum 0.03 Grams per Tonne, Silver 1.94 Grams per Tonne |
| Geordie Lake Hangingwall Zone | 2010 | Measured + Indicated Resource | 2360000 | 2010 NI 43-101 report | $13 CAD cutoff; 24,310 oz Pd, 1,810 oz Pt, 1,920 oz Au, 10,510,000 lb Cu, 170,370 oz Ag | Copper 0.2 Percent, Gold 0.03 Grams per Tonne, Palladium 0.32 Grams per Tonne, Platinum 0.02 Grams per Tonne, Silver 2.25 Grams per Tonne |
| Geordie Lake Main Zone | 2010 | Measured + Indicated Resource | 30070000 | 2010 NI 43-101 report | $13 CAD cutoff; 616,740 oz Pd, 37,700 oz Pt, 47,780 oz Au, 253,150,000 lb Cu, 2,887,470 oz Ag | Copper 0.38 Percent, Gold 0.05 Grams per Tonne, Palladium 0.64 Grams per Tonne, Platinum 0.04 Grams per Tonne, Silver 2.99 Grams per Tonne |
| Geordie Lake Main Zone | 2010 | Inferred Mineral Resource | 7360000 | 2010 NI 43-101 report | $13 CAD cutoff; 143,560 oz Pd, 8,040 oz Pt, 9,930 oz Au, 59,390,000 lb Cu, 697,710 oz Ag | Copper 0.37 Percent, Gold 0.04 Grams per Tonne, Palladium 0.61 Grams per Tonne, Platinum 0.03 Grams per Tonne, Silver 2.95 Grams per Tonne |
| Geordie Lake | 2002 | Inferred Mineral Resource | 5400000 | Resource Estimate by Giroux Consultants | $10 CAD cutoff; 108,000 oz Pd, 7,000 oz Pt, 9,000 oz Au, 43 million lb Cu, 524,000 oz Ag | Cobalt 0.007 Percent, Copper 0.36 Percent, Gold 0.05 Grams per Tonne, Nickel 0.012 Percent, Palladium 0.626 Grams per Tonne, Platinum 0.04 Grams per Tonne, Silver 3.04 Grams per Tonne |
| Geordie Lake | 2002 | Indicated Mineral Resource | 24400000 | Resource Estimate by Giroux Consultants | $10 CAD cutoff; 421,000 oz Pd, 24,000 oz Pt, 31,000 oz Au, 175 million lb Cu, 1,978,000 oz Ag | Cobalt 0.007 Percent, Copper 0.326 Percent, Gold 0.04 Grams per Tonne, Nickel 0.011 Percent, Palladium 0.537 Grams per Tonne, Platinum 0.030 Grams per Tonne, Silver 2.52 Grams per Tonne |
Map - Geological Compilation of the Eastern Half of the Schreiber-Hemlo Greenstone Belt
Publication Number: M2614 Scale: 1:50,000 Date: 2000
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 347 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Thesis - Petrology, Geochemistry, Sulphide, and Platinum-Group Element Mineralization of the Geordie Lake Intrusion, Coldwell Complex, Ontario
Publication Number: MSc Date: 1989
Author: Mulja, T.
Publisher Name: Lakehead University unpublished
Location:
Map - Manitouwadge sheet, districts of Thunder Bay and Algoma, geological compilation series
Publication Number: P0494 Scale: 1:126,720 Date: 1997
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - A Resource Estimate on Geordie Lake Palladium-Copper Property in Northern Ontario
Publication Number: 2002 NI 43-101 Date: 2002
Author: Giroux, G.H. and Stanley, A.D.
Publisher Name: Giroux Consultants Ltd. for L.E.H. Ventures Ltd.
Location: SEDAR
Map - Precambrian Geology, Port Coldwell Complex, West Half
Publication Number: P3232 Scale: 1:20,000 Date: 1993
Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.
Publisher Name: Ontario Geological Survey
Location:
Publication - A Contribution to the Petrology of the Coldwell Alkaline Complex, Northern Ontario; Geological Survey of Canada, Bulletin 287
Publication Number: GSC Bull 287 Date: 1980
Author: Currie, K.L.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/106630
Article - PGE study of the Geordie Lake and Marathon Cu-Ni-precious metal deposits, Coldwell alkalic complex
Publication Number: MP143.341 Date: 1997
Author: Good D.J., Crocket J.H.
Publisher Name: Ontario Geological Survey
Location:
Map - Port Coldwell area, District of Thunder Bay
Publication Number: P0114 Scale: 1:31,680 Date: 1997
Author: Puskas F.P.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Mafic Mineralogy of Ferroaugite Syenite from the Coldwell Alkaline Complex, Ontario, Canada; Journal of Petrology, v. 19, pt. 4, p. 627-651
Publication Number: JofPet v.19 Date: 1978
Author: Mitchell, R.H., Platt, R.G.
Publisher Name: Journal of Petrology
Location:
Publication - Aspects of the Geology of the Coldwell Complex: Field Trip A2
Publication Number: Date: 1980
Author: Mitchell, R.H., Platt, R.G.
Publisher Name: GAC-MAC
Location:
Publication - The Geordie Lake Intrusion, Coldwell Complex, Ontario: A Palladium- and Tellurium-rich Disseminated Sulphide Occurrence Derived from an Evolved Tholeiitic Magma; Economic Geology v. 86, no. 5, p. 1050-1069
Publication Number: EcGeol v.86 Date: 1991
Author: Mulja, T., Mitchell, R.H.
Publisher Name: Economic Geology
Location:
MonoMap - Precambrian Geology of the Coldwell Alkalic Complex
Publication Number: OFR5868 Date: 1993
Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.
Publisher Name: Ontario Geological Survey
Location:
Publication - Technical Report and Resource Estimate, 2010 Update for the Geordie Lake Property, Northern Ontario
Publication Number: 2010 NI 43-101 Date: 2010
Author: Drennan, M., Fell, M.
Publisher Name: Python Mining Consultants for Marathon PGM Corp.
Location: SEDAR
Publication - Technical Report, Updated Mineral Resource Estimate of the Marathon Deposit
Publication Number: 2019 NI 43-101 Date: 2019
Author: Puritch, E., Brown, F., Feasby, D.G., Pitman, P., Barry, J., Mackie, B., Bu
Publisher Name: P&E Mining for Generation Mining
Location: SEDAR
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office