Ontario Geological Survey
Permanent Link to this Record:
MDI52F05NE00008
| Record Name(s) | Maybrun Mine - 1983, Atikwa Lake Mine - 1983 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1983-Dec-15 |
| Date Last Modified | 2023-Aug-16 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper, Zinc
Township or Area: Atikwa Lake Area
Latitude: 49° 25' 17.81" Longitude: -93° 39' 3.03"
UTM Zone: 15 Easting: 452799 Northing: 5474530 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F05NE
Point Location Description: Data compilation
Location Method: AMIS Site Visit
Access Description: Accessible by the Maybrun Mine road - departs eastwards from Hwy.71, approx. 60km south of Kenora, ON
1951: property was staked by two Noranda prospectors (Bill Cranston & Jack Kenty) who discovered copper mineralization near the southwest corner of Atikwa Lake Bay. 1951-53: Noranda carried out exploration work on the property including prospecting, mapping, surface work, geophysical surveys (EM & SP), diamond drilling and camp construction. 1955: property was sold to Maybrun Mines. A mag survey was completed in addition to drilling 113 surface and underground DDH totalling 87,634 feet as a 3-compartment shaft was sunk, reaching 298 feet. Two levels were established on the 45m and 83 m levels. 1955-57: diamond drilling from surface and underground included a total of 236 DDH totalling 28,750 m. 1956: Magnetometer survey.1957: The price of base metals fell and in 1958, the operation was shut down. 1960: Several claims covering the mineralized area were brought to patent. Late 1965: Increasing copper prices encouraged exploration to resume - geophysical programs and diamond drilling were carried out in an attempt to block out projected ore shoots, check continuity at depth, explore untested areas and assess the open pit potential. The property was increased to about 53 claims and the zone of chalcopyrite had been traced over a length of 2,600 feet. 1966: Vertical holes were drilled to define the zone. 1967: IP survey. 1968: The property was leased to Sheridan Geophysics Limited for a term of 20 years. 1969: Maybrun acquired an additional 125 claims adjoining the original property and continued diamond drilling to delineate and detail the open pit area. 1970: A 500-ton per day plant and facilities was installed and open pit development commenced. March, 1971: The mill tuned up, but production was deferred pending improved copper prices. April, 1973: Production started April 01st and the Maybrun began an exploration and diamond drilling program. Two gold zones (1,000 and 1,800 feet) were located north of the main Cu-Au zone. These two zones were released from the Sheridan lease and Maybrun negotiated for development and production by 1975. Sheridan estimated that the reserves to 275 feet were sufficient for a 4-year operation. 1974: Operations were suspended in December due to winter road difficulties. Re-opening was delayed until favourable economic conditions were attained. 1978: The owning company changed its name to 'Consolidated Maybrun Mines Limited' in an effort to refinance. The Atikwa Lake property was kept on a care and maintenance basis by Sheridan Geophysics Limited. 2005: Opawica Explorations Inc. acquired 100% of the Maybrun-Atikwa Lake Property and drilled 18 DDH totalling 2964 m, with downhole pulse electromagnetic surveys being completed in 4 holes. 2006-7: Opawica completed 18 DDH totalling 2731 m and geophysical surveys including mag and IP. 2008: Opawica drilled 70 DDH totalling 13,200 m. 2009: Opawica drilled 16 DDH totalling 3617 m. 2010: Opawica drilled 20 DDH totalling 2462 m. 2011: Opawica drilled 10 DDH. 2012: San Gold purchased the Atikwa leases from Opawica in September. 2013: San Gold acquired the surrounding claims from Canadian Arrow in December. 2014: San Gold declared bankruptcy.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52F/05NE, P-5, Maybrun Limited (Consolidated) | 52F05NE0002 | 52F05NE0002 |
| 52F/05NE, Q-1, Opawica Exploration Inc. | 20000003515 | 20000003515 |
| 12 | 52F05NE0032 | 52F05NE0032 |
| 63.2331 | 52F05NE0047 | 52F05NE0047 |
| 63.707 | 52F05NE0050 | 52F05NE0050 |
Province: Superior
Geological Age: Precambrian
May 26, 2015 (Therese Pettigrew) - The Atikwa Lake Property is sited at the southwest termination of the Atikwa Lake batholith, a major polyphase plutonic complex within the core of the western Wabigoon greenstone belt. At Head Bay, at the southwest end of Atikwa Lake, an apophysis of the batholith intrudes into a southwest-striking fault-fracture system extending on to Denmark Lake. The oldest marginal phases of the Atikwa batholith comprise a series of layered gabbro-peridotite sills that include the Mulcahy Gabbro (dated at 2733 Ma), the Empire, Denmark Lake, Rupert, and Overflow Bay bodies. These gabbroic complexes host magmatic Ni-Cu-PGE occurrences such as the Kenbridge deposit at the north end of the Empire gabbro and several mineralized prospects in the Denmark Lake area. The Atikwa batholith evolves inward through diorite-granodiorite to granite. The youngest syenogranites, such as the Flora Lake stock, date as young as 2690 Ma, indicating batholithic emplacement took place over a protracted 40 million year time interval (Laakso, 2009).
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Gabbro | 2 | Intrudes |
May 26, 2015 (Therese Pettigrew) - The Atikwa Lake area is predominantly underlain by massive and pillowed basaltic flows that enclose a few thin felsic volcaniclastic lenses. Overlying these are mafic tuffs, greywackes and sandstones; the transition is considered to correspond to change from mafic to felsic volcanism in the Lower Keewatin Group. The rocks were steeply folded during the Kenoran orogeny, exposing about 4.9 km of metavolcanic rocks and an estimated 1.8 km of metasediments. The westernmost lobe of the Atikwa Lake Batholith consists of granodiorite and quartz diorite, with an outer dioritic zone. A complex of ultramafic, mafic, intermediate and felsic intrusions, in approximate order of decreasing age, lies at the southern edge of the batholith and is believed to be structurally related to it. Elongate, partly concordant bodies of gabbro, numerous small intermediate felsic intrusions, and the elliptical, composite Flora Lake Stock lie wholly within the metavolcanics. Intrusion is considered to have occurred mainly during the climax of almandine-amphibolite facies metamorphism, at a late stage in the folding. Fracturing appears to have been primarily related to the batholithic intrusion. Locally, development of greenschist facies mineral assemblages resulted from shearing (Laakso, 2009).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Pyrrhotite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore | ||||
| 5 | Chalcocite | Economic | Ore | ||||
| 6 | Cubanite | Economic | Ore | ||||
| 7 | Covellite | Economic | Ore | ||||
| 8 | Sphalerite | Economic | Ore | ||||
| 9 | Cobaltite | Economic | Ore |
May 26, 2015 (Therese Pettigrew) - Most known mineral deposits in the Atikwa Lake area fall into three categories: Au in quartz veins, Ni and Cu in mafic and ultramafic intrusions, and Cu (with or without Au) in pillowed basalt flows. The Atikwa Lake Cu-Au-Ag mineralization is hosted solely within the lower flows. Inter-pillow spaces are unusually large and are filled by white carbonate. Pyrrhotite-chalcopyrite sulphide replacement of interstitial carbonate approximates the transit from dark green to pale green glomerocrystic pillows (lower to upper flows), about 50 m down section from the uppermost limit of glomerocrystic upper flows. The Atikwa Lake Property is interpreted as a synvolcanic, non-stratiform hydrothermal replacement deposit related to sill emplacement within mafic volcanic flows. Composite peridotite-pyroxenite-gabbro bodies intrude into mineralized zones at two localities: the Northern Ultramafic (mine grid 1260N, 2375E); and the Southern Ultramafic (mine grid 800N, 2425E). These bodies host significant blebby to disseminated pyrrhotite-chalcopyrite mineralization. Assays of dispersed sulphide mineralization from the ultramafic bodies demonstrate a magmatic Ni-Cu-PGE-Au signature, with some samples having very highly elevated gold contents (Laakso, 2009). Notable assays from the 2010 drilling program include AT-10-01: 5.21 g/t Au, 0.162% Cu over 2 m (339-341 m) including 8.95 g/t Au, 0.212% Cu over 1 m (339-340 m); AT-10-02: 15.64 g/t Au, 0.012% Cu over 1.0 m (269.0-270.0 m); AT-10-03: 5.79 g/t Au, 0.291% Cu over 2 m (517-519 m) including 8.87 g/t Au, 0.107% Cu over 1 m (517-518 m); AT-08-01 Ext: 6.43 g/t Au, 1.317% Cu over 27 m (60-87 m) including 10.24 g/t Au, 2.396% Cu over 9 m (65-74 m) (Laakso et al., 2010). Chalcopyrite mineralization has been encountered over a length of 2600 feet (Shklanka, 1969).
| Rank | Classification |
|---|---|
| 1 | Hydrothermal |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Maybrun Footwall | 2009 | Inferred Mineral Resource | 5400000 | Laakso, 2009 (NI 43-101 report) | 0.40 g/t Au cutoff; 163,000 oz Au, 21,696,000 lb Cu | Copper 0.18 %, Gold 0.94 g/t |
| Maybrun Main | 2009 | Inferred Mineral Resource | 1738000 | Laakso, 2009 (NI 43-101 report) | 0.40 g/t Au cutoff; 64,000 oz Au, 11,622,000 lb Cu | Copper 0.30 %, Gold 1.15 g/t |
| Maybrun North | 2009 | Inferred Mineral Resource | 3454000 | Laakso, 2009 (NI 43-101 report) | 0.40 g/t Au cutoff; 74,000 oz Au, 18,921,000 lb Cu | Copper 0.25 %, Gold 0.67 g/t |
| Maybrun Main | 2009 | Indicated Mineral Resource | 7366000 | Laakso, 2009 (NI 43-101 report) | 0.40 g/t Au cutoff; 151,000 oz Au, 66,466,000 lb Cu | Copper 0.41 %, Gold 0.64 g/t |
| Maybrun Mine | 1969 | Unclassified | 1155000 | Shklanka, 1969, p. 163 | Historical resource, not NI 43-101 compliant; in an area 185 ft wide by 150 ft deep | Copper 1.12 %, Gold 0.03 oz/T |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1974 | 181437 | 2010 NI 43-101 | Estimated 200,000 tons removed from the pit. No recovery information available. |
Publication - Technical Report on the Atikwa Lake (Maybrun) Copper-Gold Property
Publication Number: 2009 43-101 Date: 2009
Author: Laakso, R.
Publisher Name: Opawica Explorations Inc
Location: SEDAR
Publication - Technical Report; Preliminary Scoping Study on the Atikwa Lake (Maybrun Mine) Gold and Copper Property
Publication Number: 2010 43-101 Date: 2010
Author: Laakso, R., O’Flaherty, M., O’Flaherty, K.
Publisher Name: Opawica Explorations Inc.
Location: SEDAR
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 163 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Atikwa Lake area, District of Kenora
Publication Number: R111 Page: 34-37 Date: 1973
Author: Davies J.C.
Publisher Name: Ontario Division of Mines
Location:
Journal - Kenora Historical File 52F/05NE00008, Maybrun Mine
Publication Number: Date: 2011
Author:
Publisher Name:
Location: KENORA GEOLOGY OFFICE ONLY
Journal - Kenora Property Visit File 52F/05NE00008, Maybrun Mine, 1990
Publication Number: Date: 2011
Author:
Publisher Name:
Location: Kenora RGP office
Mono - Report of Activities 2010, Resident Geologist Program, Red Lake Regional Resident Geologist Report: Red Lake and Kenora Districts
Publication Number: OFR6261 Date: 2011
Author: Lichtblau A.F., Ravnaas C., Storey C.C., Bongfeldt J., McDonald S., Lockwood H.C., Bennett N.A., Jeffries T.
Publisher Name: Ontario Geological Survey
Location:
Map - Atikwa Lake, Kenora District
Publication Number: M2273 Scale: 1:31,680 Date: 1973
Author: Davies J.C.
Publisher Name: Ontario Division of Mines
Location:
Map - Precambrian Geology Kakagi-Rowan Lakes Area
Publication Number: P3594 Scale: 1:50,000 Date: 2007
Author: Johns G.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Atikwa-Caviar lakes area, District of Kenora
Publication Number: P0084 Scale: 1:31,680 Date: 1997
Author: Johnston W.G.Q.
Publisher Name: Ontario Dept. of Mines
Location:
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