Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41P15NE00014

Record: MDI41P15NE00014

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Silver, Copper, Molybdenum, Lead

Location

Township or Area: Powell

Latitude: 47° 56' 49.44"    Longitude: -80° 40' 43.95"

UTM Zone: 17    Easting: 523978.95   Northing: 5310466.9    UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 41P15NE

Point Location Description: Shaft

Location Method: AMIS Site Visit

Access Description: Proceed on highwayy west of Matachewan 2.6km from the Montreal River bridge. Turn left on the Midlothian Township access road and proceed 0.3km to the Young-Davidson access road. Turn right and proceed 0.6km to the mine site.

Exploration History

1916-1933: Young-Davidson Mines Ltd.: surface prospecting, hand trenching and stripping. Pre-production activities. 1934-1957: Hollinger Corporation: production of gold under contract from Young- Davidson Mines. According to records maintained by the Ontario Geological Survey, a total of 6,218,272 tons were produced at an average grade of 0.094 oz/ton Au (585,690 ounces Au). 1979: Pamour: concluded Option Agreement. 1980: Pamour: Diamond drilling, 44 holes totaling 12,841 ft. 1986: Pamour: additional diamond drilling in Boundary Pit Area, 84 holes totaling 32,130 ft. 1988: Pamour: diamond drilling, 10 holes totaling 3,882 ft., testing shallow targets and upper portions of the Boundary Zone. 1989: Pamour: diamond drilling, 10 holes totaling 13,052 ft., testing Boundary Zone (underground target). 1990: Pamour: diamond drilling, 34 holes, testing several targets in syenite. 1995: Royal Oak Mines Inc: diamond drilling, 68 holes totaling 71,102 ft. that tested selected underground targets, and testing for the western and depth extensions of the open pit mineralization, assays. 1996: Royal Oak Mines Inc: diamond drilling, 23 holes totaling 11,832 ft., confirming the western and depth extensions of the open pit mineralization, and to confirm the assay values indicated by the 1980 vintage drill holes, environmental baseline survey. 1997: Royal Oak Mines Inc: diamond drilling, 9 holes totaling 3,383 ft. 2003: Young-Davidson Mines, Limited: diamond drilling, 10 holes totaling 5,407 ft. Northgate acquired the property in 2005 and began diamond drilling in January 2006. Diamond drilling to October 14, 2008 totaled 116 722.8 m in 274 holes and wedge holes. A ramp was developed for diamond drilling and a bulk sample near the Matachewan Consolidated shaft. In January 2009, the company updated the resources estimate on the property. 2010-2012: DD-72-24,172 m - construction began for a 2012 mine opening. Initial production from open pit. 2011: Aurico Gold Inc. acquired Northgate. 2013: started production from underground. Pit exhausted in early 2014 but still mining stockpile. 2015: AuRico merged with Alamos Gold Inc.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Tectonic Assemblage: Tisdale

Geological Age: Archean  

Geology Comments

Sep 05, 2008 (D Guidon) - From NI 43-101 (2008) The YD Property is located within the southwestern part of the Abitibi Greenstone Belt, which is the largest preserved Archean greenstone belt in the world and one of the most continuous units of the Superior Geologic Province. The Abitibi Greenstone Belt extends for 750 km from the Grenville Province in the east to the Kapuskasing Gneiss Belt in the west, and for over 170 km from the Opatica Gneissic belt in the north to the Proterozoic Huronian sedimentary rocks in the south. The regional Larder Lake-Cadillac Fault Zone (LLCFZ) cuts across the YD Property. The LLCFZ has a sub-vertical dip, and generally strikes east-west. The LLCFZ is characterized by chlorite-talc-carbonate schist, and the deformation zone can be followed for over 200 km from west of Kirkland Lake to Val d’Or. The syenite-hosted gold deposits, commonly associated with quartz-monzonite to syenite stocks and dikes, has been individualized as a distinct group of gold deposits, well represented in the Abitibi Greenstone belt (Salvi and Williams-Jones, 2004), and particularly at the Porcupine and Kirkland Lake districts, Northern Ontario. The Young-Davidson deposit, also located in the Abitibi greenstone belt, can be classified as an Archean, syenite-hosted gold deposit. The gold mineralization is primarily related to quartz veinlet stockworks and disseminated pyrite mineralization, mostly enclosed within the syenite intrusion boundaries, or very close to the contacts with the enclosing rocks, and is frequently associated with broader zones of potassic alteration.

Lithology

Lithology Comments

Mar 02, 2009 (D Guidon) - From NI 43-101 report (Evans 2007) The lithologic assemblage exposed on the YD Property is described below in order of super-position or from the oldest to youngest (Edmunds, 2007). The descriptions are based on core observations and those of previous workers such as Reno Pressacco (Micon , 2004), David Rhys (Panterra Geoservices Inc., 2003), and Powell et al. (1991). Larder Lake Group (Archean) The Larder Lake Group is intermittently exposed in the central eastern portion of the land package. It is comprised of interbedded mafic to ultramafic flows of tholeiitic to komatiitic composition and interflow volcanic derived sediments. The ultramafic rocks occur as dark grey-green talc-chlorite+carbonate schist with all primary textures destroyed by metamorphism and deformation. In core, these units range from 50 ft. to 300 ft. in intersected thickness. Tholeiitic basalt occurs as finer grained massive featureless chlorite sericite schist often grey-green in colour. Areas exposed at surface northeast of the #2 Shaft show well developed pillow textures indicating younging directions to the south. Some core holes have intersected narrow sections of mafic lapilli tuff and related fragmental breccia. The proportion of ultramafic in the Larder Lake rocks varies across the property and appears to increase towards the west. Timiskiming Group (Archean) The Timiskiming Group rocks dominate the northern reaches of the property and, at surface, are presented as a monotonous sequence of quartz-wacke, greywacke, and siltstone. There are rare surface exposures of the contact between Larder Lake Group and Timiskiming sediments and these often show a basal polymictic conglomerate comprised of clasts ranging from 0.5 in. to 1.0 in. in diameter. This observation implies an opposing or northerly younging direction for the Timiskiming assemblage. Core logging of deeper drill holes has identified polymictic fragmental units within the Timiskiming which have been described as jasperoidal sediments due to the presence of chert clasts. These fragmental units may be the same basal conglomerate. Gowganda Formation (Proterozoic) Gowganda Formation rocks are dominated by red to brown-grey interbedded conglomerate (tillite), mudstone, and sandstone which can be massive to well-bedded in sections. The glaciogenic origin for these sediments is suggested by the presence of drop stones in otherwise massive graded units. The contact between the base of the Gowganda and the underlying rocks is always very sharp, but has only been observed in drill core. Gowganda Formation rocks cover the southern two thirds of the property. Intrusive Rocks The most abundant Algoman intrusive rocks are dominated by syenite feldspar porphyry and trachytic syenite porphyry. These units are often comprised of 30% to 70% fine to coarse grained alkali feldspar phenocrysts set in a finer grained compositionally similar matrix. Alteration affects the colour of the syenite units and ranges from economically significant brick red to brown or grey. The “trachytic” term is used to describe flow aligned feldspar laths in certain sections of syenite which can range up to one inch in length. The Matachewan area is well known for diabase dikes, and those that affect the area covered by the exploration work are Matachewan diabases, which occur as dark greygreen dikes with fine to medium grain size, often showing chill-bake margins and feldspar textures which vary from glomerophyric to massive.

Mineralization

Mineralization Comments

Sep 05, 2008 (D Guidon) - From Northgate NI 43-101 (2008) At least five styles of gold mineralization are recognized at the YD Project. They are described in detail by Micon (2004) and PGI (2003). 1. Syenite-hosted gold mineralization 2. Mafic volcanic-hosted gold mineralization (MCM Mine) 3. Timiskaming sediment-hosted gold mineralization 4. Ultramafic-hosted gold mineralization 5. Hanging wall contact gold mineralization Essentially, all of the historical production at the YD Mine, and approximately 60% of the production from the MCM Mine is from syenite-hosted gold mineralization (Lovell, 1967). Most of the current open pit and underground resources are also related to syenite-hosted gold.

Mineral Record Details

Site Visit Information

Date: May 16, 2007

Geologist: D Guidon

Notes: Property visited with Gary Grabowski and a group from MNR in Kirkland Lake. We were provided with a talk on the advanced exploration program. The program received permitting in the fall of 2006 and the ramp was started in February 2007. At the time of the visit, the ramp had advanced about 750 feet. Dewatering of the shaft is underway. Water is pumped from the shaft into a settling pond before being pumped down the pipe line to the river. Northgate has about $22 million for the advanced program for 2007 and an additional $5 million for surface diamond drilling. The advanced program will be completed in the fall of 2008. Photos of the settling pond, the group and 2 of the portal.

Date: Oct 09, 2008

Geologist: D Guidon

Notes: Underground visit with Gary Grabowski, Martine Francoeur, 2 from GSC and Ken Kryklywy (Northgate). Visit to the 230 m level to look at ore zone where the bulk sample was taken. In the vicinity of the cross-cut on the 230 m level, a syenite dike separates Timiskaming sedimentary rocks from the Lower Tisdale. The Lower Tisdale side of the syenite displays more structural deformation than does the Timiskaming side. The 90 m long cross-cut was driven to extract a 50 t bulk sample for metallurgical testing. The cross-cut passes through 45 m of mineralized rock, ranging from 3 to 29 g/t gold, averaging 4.8 g/t gold (cut to 20 g/t gold). The syenite is red with greater than 2% disseminated pyrite in a stock work of quartz, carbonate and K-feldspar veinlets. Further south in the cross-cut, the syenite is brown with less veining and exhibits a lower, patchy grade. The higher grade zone of red syenite is about 16 m thick. The contact between the brown and red syenite is sharp. By December 2008, the ramp was advanced to 3039 m with a vertical depth of 483 m and the shaft was refurbished to the 13th level. An updated resource calculation was completed totalling over 4 million ounces of gold in all categories. The 43-101 Preliminary Economic Assessment Report was being updated. The 2009 exploration program will focus on targets outside the known resource areas, including the area covered by Huronian Supergroup sedimentary rocks.

References

File - Resident Geologist files KL-1762, KL-2177, KL-2878, KL-5357

Publication Number: Date:

Author:

Publisher Name:

Location: Kirkland Lake RGP office

Mono - Report of Activities 2022, Resident Geologist Program, Timmins Regional Resident Geologist Report: Timmins and Sault Ste. Marie Districts

Publication Number: OFR6402 Page: 6  Date: 2023

Author: Azadbakht Z., Krukowski M., Maity B.K., Bousquet P., Daniels C.M., Hinz S.L.K., Adrianwalla C.J., Dorland G., Sabiri N., Patterson C.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology and ore deposits of the Matachewan-Kenogami area

Publication Number: ARV44-02.001 Page: 36-42  Date: 1998

Author: Dyer W.S.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of the Matachewan area, District of Timiskaming

Publication Number: R051 Page: 32-36  Date: 1967

Author: Lovell H.L.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold deposits of Ontario, part 2, part of District of Cochrane, districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and counties of southern Ontario

Publication Number: MDC018 Page: 163-164  Date: 1979

Author: Gordon J.B., Lovell H.L., de Grijs J.W., Davie R.F.

Publisher Name: Ontario Geological Survey

Location:

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

Publication Number: OFR5467 Page: G0635  Date: 1983

Author: Hodgson C.J.

Publisher Name: Ontario Geological Survey

Location:

File - Res/Reg Property Visit Report KL #65, 208

Publication Number: PV-65 Date: 1901

Author:

Publisher Name:

Location: Kirkland Lake RGP office

Book - Property visit file PV-208

Publication Number: PV-208 Date: 1901

Author:

Publisher Name:

Location: Kirkland Lake RGP office

Map - Geological Compilation of the Central Abitibi Greenstone Belt: Kapuskasing Structural Zone to the Quebec Border

Publication Number: P3565 Scale: 1:250,000    Date: 2005

Author: Ayer J.A., Berger B.R., Hall L.A.F., Houlé M.G., Johns G.W., Josey S.D., Madon Z.B., Rainsford D.R.B., Trowell N.F., Vaillancourt C.

Publisher Name: Ontario Geological Survey

Location:

Map - Matachewan gold area, townships of Powell and Cairo, District of Timiskaming, Ontario

Publication Number: ARM44A Scale: 1:24,000    Date: 1997

Author: Dyer W.S., Charlewood G.H.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Report of Activities 2017, Resident Geologist Program, Kirkland Lake Regional Resident Geologist Report: Kirkland Lake and Sudbury Districts

Publication Number: OFR6340 Page: 5  Date: 2018

Author: Chadwick P.J., Péloquin A.S., Suma-Momoh J., Daniels C.M., Bousquet P., Wilson A.C., Sabiri N., Szumylo N.

Publisher Name: Ontario Geological Survey

Location:

Publication - NI 43-101 Technical Report and Preliminary Asssessment on the Young-Davidson property, Matachewan, Canada

Publication Number: Date: 2008

Author: P. Rocque, W. Hamilton, A. Simon, R. Welyhorsky and S. Daniel

Publisher Name: Northgate Minerals Corporation, SEDAR

Location: SEDAR

Map - Powell and Cairo townships, Timiskaming District

Publication Number: M2110 Scale: 1:31,680    Date: 1997

Author: Lovell H.L.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Report of Activities 2018, Resident Geologist Program, Kirkland Lake Regional Resident Geologist Report: Kirkland Lake and Sudbury Districts

Publication Number: OFR6355 Date: 2019

Author: Chadwick P.J., Péloquin A.S., Suma-Momoh J., Daniels C.M., Bousquet P., Kennedy C.A., Sabiri N.

Publisher Name: Ontario Geological Survey

Location:

Mono - Molybdenum deposits of Ontario

Publication Number: MDC007 Page: 80  Date: 1968

Author: Johnston F.J.

Publisher Name: Ontario Dept. of Mines

Location:

Data - Results from the Shining Tree, Chester Township and Matachewan Gold Projects and the Northern Cobalt Embayment Polymetallic Vein Project

Publication Number: MRD294 Date: 2013

Author: Ayer J.A., Kontak D.J., Linnen R.L., Lin S.

Publisher Name: Ontario Geological Survey

Location:

Mono - Report of Activities 2019, Resident Geologist Program, Kirkland Lake Regional Resident Geologist Report: Kirkland Lake and Sudbury Districts

Publication Number: OFR6367 Date: 2020

Author: Chadwick P.J., Péloquin A.S., Suma-Momoh J., Daniels C.M., Hinz S., Kennedy C.A., Streit L., Todd R.M.

Publisher Name: Ontario Geological Survey

Location:

Mono - Report of Activities 2020, Resident Geologist Program, Kirkland Lake Regional Resident Geologist Report: Kirkland Lake and Sudbury Districts

Publication Number: OFR6375 Date: 2021

Author: Chadwick P.J., Péloquin A.S., Suma-Momoh J., Daniels C.M., Hinz S.L.K., Dorland G., Patterson C., Todd R.M.

Publisher Name: Ontario Geological Survey

Location:

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