Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C08SW00005

Record: MDI42C08SW00005

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Silver

Location

Township or Area: Finan

Latitude: 48° 17' 11.74"    Longitude: -84° 26' 59.96"

UTM Zone: 16    Easting: 689156.4   Northing: 5351298.01    UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C08SW

Point Location Description: Magino Mine headframe

Location Method: Field Visit with GPS

Access Description: Access is via an 18 km all-weather gravel road that turns off of highway 519 just west of the town of Dubreuilville. Dubreuilville is on highway 519, 44 km east of the junction of Highway 17 and 519.

Exploration History

1917-18: J. W. Webb - discovery. 1925-34: McCarthy-Webb Goudreau Mines Ltd. - stripping, trenching, 2099 ft diamond drilling (5 holes), sinking 2 test shafts (28 ft and 35 feet). 1931: Consolidated Mining and Smelting - sampling 1933: McCarthy Webb - 25 tpd mill installed. 1934-39: Algoma Summit Gold Mines - operation, mill capacity increased to 50 tpd in 1936, 500 tpd mill installed in 1937, by 1938 inclined shaft to 417 feet with two levels. 1939-47: Magino Gold Mines - mine taken over by Magino in September 1939, mine ceased operation February 1939, in 1940 there was 2316 ft underground drilling completed, optioned by Cline Lake Gold Mines in 1942 who completed 4816 ft (13 ddh) of surface drilling on the property. 1972: C. H. McNellan - 6 ddh (2003 ft). 1981: Rico Copper Limited - 16 ddh (7415 ft). 1981-84: McNellen Resources Limited - name change of Rico Copper, joint venture agreement with Cavendish Investing, shaft dewatered, 8581 ft undergrpund drilling, 16 200 ft of surficial drilling, ore reserve calculations; in 1984 company completed 33 ddh (7284 ft) north and west of main property, 24 ddh (5121 ft) on main mine property. 1985: Muscocho Exploration Ltd. - purchased 50% JV of Cavendish Investing, 29 ddh (6441 ft). 1986: Muscocho Exploration Ltd. - mapping, diamond drilling, ore reserve calculation, 1900 feet of ramping, 755 ft cross cutting, 420 ft drifting, 12 U/G ddh, 34 747 ft surfical drilling. 1987: Muscocho Exploration Ltd. - underground development, installation of 400 tpd mill. 1987-95: Muscocho Exploration Ltd. - production, mine closed August 1992, ground geophysical survey. 1996-2010: Golden Goose Resources Inc - company name change, 95 ddh (28,755m), ore reserve calculation, heap leach feasibility study, two bulk samples, stripping, sampling, soil geochemistry. 2010: Kodiak Exploration Ltd. - compilation, sampling. 2011: Prodigy Gold Incorporated - metallurgical testing, DD-242-67848 m. 2012: Argonaut Gold Inc. - combines with Prodigy Gold

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Tectonic Assemblage: Wawa

Geological Age: Neoarchean   Geochronological Age: 2750 MA   Geochron. Age Ref.: GOO VOL 1

Metamorphism Type: Regional

Metamorphism Grade: Greenschist

Geology Comments

Jul 11, 2013 (A Wilson) - The mine straddles the boundaries between the Northern and Southern Domains of the Goudreau Lake Deformation Zone. The GLDZ is up to 4.5 km in width and strikes in a gentle sigmoid-form for at least 30 km, subparallel to the stratigraphy and the regional foliation. In the immediate Goudreau-Lochalsh area, the GLDZ is coincident with a major contact between Cycle 2 and Cycle 3 volcanics. There is a strong structural control of the gold-bearing quartz veins systems within each of the 070-075 striking high-strain zones within the deformation zone. There are several parallel high-strain zones within the Webb Lake Stock. These zones are parallel to the regional schistosity in the area. Individual quartz veins are localized within narrow, secondary, brittle-ductile shear fractures.

Lithology

Lithology Comments

Jul 11, 2013 (A Wilson) - The Webb Lake stock has been termed a quartz porphyry, quartz-felspar porphyry, quartz diorite, granite-monzonite porphyry, granodiorite or trondhjemite. The intrusion has undergone extensive deformation and metasomatic alteration and is highly sheared. The stock has intruded intermediate to mafic metavolcanic rocks that are locally cut by gold-bearing quartz veins. The Webb Lake stock is east-north-east-striking and has a steep northerly dip. Its surface expression is at least 1,800 m long and up to 300 m wide. The aureole rocks of the Webb Lake stock are predominately mafic volcanic rocks. The southern contact is quite linear and regular, consisting mostly of dark green mafic rocks. The northern contact is quite irregular and there is interfingering of granodiorite (trondhjemite) and aureole rocks. The granodiorite (trondhjemite) is medium- to coarse-grained, green-grey, moderately hard, non-magnetic and massive. It is locally foliated and hydrothermally altered, and has been affected by greenschist facies metamorphism. The granodiorite (trondhjemite) contains 5 to 10% veins of carbonate, quartz, tourmaline and pyrite in various orientations. Approximately 5% of the igneous rock contains healed faults and fractures, generally filled with chlorite and carbonate. They may correspond to the late, north trending, 45°-dipping, carbonate-filled faults observed underground.

Mineralization

Mineralization Comments

Jul 11, 2013 (A Wilson) - Gold mineralization occurs in several subparalle 070-080 striking high strain zones within the Webb Lake Stock and within mafic metavolcanic rocks along the northern margin of the stock. Native gold occurs in zones of pervasive silicification and in narrow (<1 cm to 20 cm wide) quartz veins that form complex vein systems 1 to 3 m wide. Gold occurs within both the quartz veins and the foliated and altered wall rocks. The best gold grades occur in the quartz veins. The average grade of the quartz veins mined was 7.45 g/t Au. The average grade of the quartz zones mined was 7.06 g/t Au. Gold mineralization occurs in several sub-parallel high-strain zones striking 070° to 080° within the Webb Lake and Lovell Lake stocks and within mafic metavolcanic rocks immediately along the northern margin of the stock . Two types of mineralized material shoots have been described, namely “zones” and “veins”. The “zones” are usually 2 to 4.5 m wide and have a strike length of 25 to 70 m. They consist of foliated, bleached and silica-flooded granodiorite (trondhjemite). The zones are folded in places, which produces mineable widths of up to 10.5 m. The “zones” dip at about the same angle as the foliation and have a vertical plunge. The vertical continuity of the “zones” is at a vertical to horizontal ratio of 2.5:1. Weak bleaching and silica flooding are the distinguishing features of the “zones”. Silica flooding consists of incipient pale gray quartz replacing the foliated granodiorite. Gold content is directly related to the amount of silica flooding. The “veins” consist of discrete pale grey to pale green to almost white quartz veins varying in width from a few to 45 cm. They have a strike length of several to 35 m. Gold values are distributed erratically within the veins, but overall grades are quite high. The veins are folded in places, with gold concentrated in the fold noses. Vertical continuity of the “veins” is similar to that of the “zones”, and the plunge is also vertical. Native gold occurs in zones of pervasive silicification and in narrow (i.e. less than 1 to 20 cm wide) quartz veins that form complex systems 1 to 3 m wide. Gold occurs within both quartz veins and foliated and altered wall rocks, but the better gold grades are in the veins. Finely disseminated leaf-like visible gold was observed in numerous quartz veins in diamond drill cores and in drift backs on the second level. The gold tends to form plates or leaves along fractures in quartz rather than coarse nuggets. The quartz hosting the gold tends to be fine-grained and dull milky grey. Up to 10% disseminated pyrite is also present, most commonly found in alteration haloes around the gold-bearing quartz veins.

Alteration Comments

Dec 07, 2005 (A Wilson) - The Webb Lake Stock has undergone varible metasomatic alteration during deformation and gold mineralization. Distict haloes of sericite-quartz-Fe carbonate-pyrite-hematite alteration are found adjacent to the quartz vein systems. Outside the gold bearing zones, the alteration within the stock is manifested by chlorite-albite-quartz-tourmaline-calcite. Locally within the stock, there are lensoidal chlorite-schist zones which represent either strongly foliated mafic metavolcanic xenoliths or chlorite-altered felsic intrusion. One of the larger chlorite-schist zones hosts significant gold mineralization.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Rank: 2       Structure Type: Vein

Site Visit Information

Date: Sep 01, 2000

Geologist: A Wilson

Notes: The ore shoots strike between 70 and 130 degrees and dip between 060 to the north and 080 to the south. They have a vertical plunge. There are usually two types of ore shoots, namely zones and veins. The zones are usually 6-15 feet wide and have a strike length of 80 to 220 feet. They are composed of foliated, bleached and silica flooded granodiorite. The gold content is directly related to the amount of silica present. The zones are sometimes folded which results in mining widths up to 35 feet. Gold grades usually improve in the noses of the folds. The veins consist of discrete quartz veins varying in width from a few inches to 18 inces. They have a strike length of several tens of feet to 120 feet. The margins fo the veins are chloritized and specks of chlorite are common within the veins. There is litte, if any, wall rock alteration. Gold values are distributed erratically within the veins but the veins are typically high-grade. The vertical extent of the veins is similar to that of the zones and the plunge also is vertical. The veins are sometimes folded and the gold is concentrated in the fold noses.

References

Book - Magino Gold Project Ontario, Canada Ni 43-101 Technical Report Mineral Resource and Mineral Reserve Update

Publication Number: NI 43-101 Page: 5-6  Date: 2022

Author: Marek, J.M., Marais, C., Addis, P., Raponi, T.R., Stanfield, K.L.

Publisher Name: Argonaut Gold Inc.

Location: SEDAR

File - Resident Geologist files WP Finan-25, WP Finan-33, WP Finan-35, WP Finan-36, WP Finan-51

Publication Number: Date:

Author:

Publisher Name:

Location: SSM RGP office

Map - Precambrian geology, Finan Township

Publication Number: P3168 Scale: 1:15,840    Date: 1990

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Publisher Name: Ontario Geological Survey

Location:

Map - Goudreau gold area, District of Algoma, Ontario

Publication Number: ARM40E Scale: 1:31,680    Date: 1997

Author: Moore E.S.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Goudreau-Lochalsh area, District of Algoma, Ontario

Publication Number: ARM49G Scale: 1:31,680    Date: 1997

Author: Bruce E.L.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Goudreau-Lochalsh area, District of Algoma, Ontario

Publication Number: ARM36B Scale: 1:63,360    Date: 1998

Author: Gledhill T.L., Collins W.H., Thomson E.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological compilation series, Wawa sheet, districts of Algoma and Sudbury

Publication Number: P0640 Scale: 1:126,720    Date: 1997

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Map - Michipicoten area, compilation sheet, District of Algoma

Publication Number: P0184 Scale: 1:126,720    Date: 1997

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Location:

Publication - The Ore Deposits of Goudreau and Magpie-hawk areas in Michipicoten District, Ontario; Summary Report 1918 Part E

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Part - Goudreau and Michipicoten gold areas, District of Algoma

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Part - Mines of Ontario in 1939

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Location:

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Location:

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Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/129999

Folio - Finan Township, District of Algoma

Publication Number: GDIF139 Date: 1997

Author: Sault Ste Marie RGO

Publisher Name: Ontario Geological Survey

Location:

Part - Notes on the Goudreau gold area

Publication Number: ARV30-04.003 Page: 43  Date: 1998

Author: Burrows A.G.

Publisher Name: Ontario Dept. of Mines

Location:

Book - Tehcnical Report, Magino Property, Wawa, Ontario

Publication Number: NI 43-101 Date: 2004

Author: Burns, N. and Reddick, J.

Publisher Name:

Location: Timmins RGO

Publication - Magino Property preliminary economic assessment technical report for Prodigy Gold Incorporated, 150 p.

Publication Number: Date: 2011

Author: F. Yu, A.F. Ross, A. Finch, H. The and D. Yang

Publisher Name:

Location: Timmins RGO

Publication - Technical Report on the Magino Mine Property, 175 p

Publication Number: Date: 2012

Author: P. Huxtable, T. McCracken, T. Kanai

Publisher Name:

Location: Timmins RGO

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