Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41P12SW00057

Record: MDI41P12SW00057

General

Commodities

Primary Commodities: Copper

Secondary Commodities: Gold, Silver

Location

Township or Area: Chester

Latitude: 47° 34' 36.05"    Longitude: -81° 52' 13.31"

UTM Zone: 17    Easting: 434545.6   Northing: 5269618.72    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 41P12SW

Point Location Description: South end of a flooded open cut.

Location Method: Field Visit with GPS

Access Description: Access is very easy as the Mesomikenda Lake access road passes close by the occurrence. From this road an old skidder trail leads to the stripped area but has recently been blocked by a beaver pond.

Exploration History

1910: The mineralization was discovered by H. Phillips. 1916: Mr Joseph Errington optioned the property and carried out a prospecting and trenching program. During the year 54 tonnes (60tons) of ore were extracted from a 25m open cut within a 60m long trench. This ore was shipped to New York and averaged 7% Cu and 5.8 g/t Au ($3.50). 1980 Hargor Resources carried out stripping and trenching in an attempt to expose strike extensions of the original Lawrence vein adjacent. Technical results of this work are not reported. 1981: King Errington Resources exposed a large area just south of the original open cut and collected a number of samples which allegedly assayed up to 13% Cu and 13 g/t Au (0.4opt). 1984: King Errington resumed exploration with a ground VLF-EM and magnetic survey then acquired results of an airborne survey flown for Blue Falcon Mines which covered the area. Follow up work in 1986 consisted additional stripping with some trenching, sampling drilling of 11 holes for a total length of 771m. During this time a bulk sample was also collected from the original open cut and processed by Lakefield Research. Average results obtained were 1.07 g/t Au, 17.6 g/t Ag, 0.93% Cu. 2007: Augen Gold Corp. – AEM, AMag, ARAD. 2010: Trelawney Mining and Exploration Inc. – AEM, AMag.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Swayze

Geological Age: Neoarchean   Geochronological Age: 2740 MA   Geochron. Age Ref.: GSC OF 3384G

Metamorphism Type: Contact

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (S Fumerton) - The mineralization is hosted in a late shear which is subparallel and close to a Matachewan diabase dyke and the fault system underlying Mesomikenda Lake. This late shear zone intersects an earlier and more widespread shear system with a general trend of 110/90deg. At the open cut this earlier trend is composed of a strong foliation, and a number of mylonitic and braided shear zones cutting the fine grained contact phase of the Chester Granitoid Complex. The southern trenches are located on a separate late shear west of the late shear associated with the open cut.

Lithology

Lithology Comments

Dec 07, 2005 (S Fumerton) - The mineralization at the open cut is hosted in veins within a fine grained contact phase of the Chester Granitoid complex. Within this phase there are up to 30% anhedral feldspar phenocrysts (<3mm). To the south, away from the contact with supracrustal rocks the grain size of the granodiorite increases and the characteristic blue quartz grains occur. Where the granodiorite is transected by numerous shear zones strong replacement sericite alteration and week chlorite alteration occur in the granodiorite. Locally iron carbonate replacement alteration is also associated with these shears especially where they have been channelled along early mafic dykes. Chlorite also occurs in thin (<5mm) veins. Two ages of subparallel mafic dykes cut the host granodiorite. The earlier set are typically less than 2m thick and are spaced ten or more metres apart. The younger dykes are large undeformed Matachewan dykes.

Mineralization

Mineralization Comments

Dec 07, 2005 (S Fumerton) - High grade mineralization forms part of a composite iron carbonate - quartz - sulphide vein system. These veins have been reported up to 1.5m thick, have a short strike length and occur overlapping with other carbonate veins or with thinner quartz veins within a shear zone. The carbonate quartz veins consist of fine grained quartz material that typically occurs as brecciated fragments within a very coarse grained carbonate matrix containing disseminated to semi-massive chalcopyrite. The chalcopyrite occurs as 1mm anhedral grains to coarse grained aggregates. Where chalcopyrite occurs in great amounts, pyrite is also to be found in lower concentrations. Small quartz extension veins are common in the larger carbonate veins. Quartz veins tend to be thinner though more continuous and locally contain semi-massive chalcopyrite in bands near the vein contacts. In these cases the chalcopyrite grains which enclose rounded quartz fragments are themselves rimmed with multiple coarse biotite crystals. Quartz also occur in knots. The fragments quartz veins are also recemented with carbonate grains (calcite + iron carbonate). Some lower grade disseminated mineralization occurs in the sheared granodiorite away from the veining. The origin of the mineralization may due to remobilisation and concentration of earlier shear hosted mineralization. The earlier mineralization may be typical of other prospects in the Chester Granitoid complex associated with shears trending 110 or 80deg. Remobilisation is associated with the development of shearing along the prominent 160deg trend and the emplacement of the Matachewan diabase dykes.

Dec 07, 2005 (A Wilson) - A bulk sample collected in 1916 returned an average assay of 7% Cu and 5.8 g/t Au. A bulk sample taken in 1984 averaged 1.07 g/t Au, 17.6 g/t Ag and 0.93% Cu. Grab samples collected by the OGS in 1993 returned values of 0.25 g/t Au, 12.5 g/t Ag, 0.25% Cu; 0.06 g/t Au, 1.3 g/t Ag, 0.07% Cu; 0.15 g/t Au, 0.3 g/t Ag and 0.1% Cu; 0.11 g/t Au, 109.2 g/t Ag, 18.88% Cu.

Assay Samples

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Intersection

Rank: 2       Structure Type: Shear

Site Visit Information

Date: Jul 28, 1954

Geologist: W Savage

Notes: The 'Sinclair Road', which now connects Gogama with the Westree-Elk Lake road, crosses the north boundary of Chester township east of Mesomikenda Lake, and about half a mile to the south passes between the lake and the old Lawrence workings on claim S-32044(P). The main showing on the Lawrence property is described in detail by Laird in his 'Three Duck Lakes' report, and was briefly examined by the writer. It was opened up as a copper prospect by J. Errington in 1916 and 60 tons of copper ore were taken from the main pit and shipped to New York. Most of the excavations are now overgrown and choked with debris, but a water-filled 60 foot length of the main pit is still exposed. It was put down in a shear zone about five feet wide which strikes S30E and dips 70 deg to the northeast. The shear zone contains a rusty irregular quartz-carbonate vein up to three feet in width in which pyrite and chalcopyrite are the predominant sulphides. Bornite stained specimens which would assay high in copper can be picked up on the dump. According to Laird the 60 tons of ore shipped in 1916 averaged 7% copper and $3.50 in gold per ton. With the present demand and price for copper it is possible that the Lawrence property will be re-investigated to determine whether or not there is a sufficient tonnage available to be profitably exploited. [ PRECIS ] (An oblique confirmation to Laird's comments is given in the Annual Report for 1917 vol 26, p.22 which documented 1,052 tons of copper ore was produced from various copper prospects along the rail lines, SLF).

References

Book - Sudbury Timmins Algoma Mineral Program, Project 1: mineral inventory of the Sudbury-Timmins-Sault Ste. Marie region, Ontario

Publication Number: GSC OF 1087 Page: 41P-501  Date: 1985

Author: Rose, D. G.

Publisher Name: Geological Survey of Canada

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

Map - Three Duck Lakes area, District of Sudbury, Ontario

Publication Number: ARM41D Scale: 1:47,520    Date: 1997

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological series, Precambrian geology of Chester and Yeo townships, and parts of Neville and Potier townships, Jerome area, Sudbury District

Publication Number: P2449 Scale: 1:15,840    Date: 1981

Author: Siragusa G.M.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology, Parts of Chester, Neville, Potier and Yeo Townships

Publication Number: OFM0214 Scale: 1:15,840    Date: 1993

Author: Siragusa G.M.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology of the Three Duck lakes area

Publication Number: ARV41-03.001 Page: 26-27  Date: 1998

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geology, Swayze greenstone belt, Gogama, Ontario

Publication Number: OF3384G Scale: 1:50,000    Date: 1999

Author: Heather, K B; Shore, G T

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/210455

Part - Notes on the south part of the Grassy River area

Publication Number: ARV35-06.004 Date: 1998

Author: Gledhill T.L.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Gold Occurrences of Ontario East of Lake Superior; Geological Survey of Canada, Memoir 192

Publication Number: GSC Mem 192 Date: 1936

Author: Kindle, E.D.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/100824

Mono - Copper, nickel, lead and zinc deposits in Ontario (revised to February, 1957)

Publication Number: MDC002 Date: 1957

Author: Thomson J.E., Ferguson S.A., Johnston W.G.Q., Pye E.G., Savage W.S., Thomson R.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Copper, nickel, lead and zinc deposits of Ontario

Publication Number: MDC012 Page: 234  Date: 1969

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Preliminary report on the Timmins-Kirkland Lake area, gold deposits file

Publication Number: OFR5467 Date: 1983

Author: Hodgson C.J.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology, Geochemistry and Mineralization of the Southern Margin of the Swayze Belt

Publication Number: OFR5844 Page: 111  Date: 1993

Author: Siragusa G.M.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Mineral Prospects of the Swayze Greenstone Belt (Volume 1, Parts of NTS 41 O and Volume 2, Parts of NTS 41 P, 42 A and 42 B)

Publication Number: OFR5912 Page: 433-435  Date: 1995

Author: Fumerton S.L., Houle K.A.

Publisher Name: Ontario Geological Survey

Location:

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