Ontario Geological Survey
Permanent Link to this Record:
MDI32D04SE00077
| Record Name(s) | Bear Lake - 2003, Amalgamated Larder - 1990, Sarcee - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1990-Dec-01 |
| Date Last Modified | 2023-Aug-18 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: McVittie
Latitude: 48° 7' 5.09" Longitude: -79° 38' 58.46"
UTM Zone: 17 Easting: 600504.744 Northing: 5330306.398 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 32D04SE
Point Location Description: Trench
Location Method: Conversion from MDI
1937: Stripping and trenching on L.2034 returned traces of gold. 1938: Sarcess Mines, Limited was organized and acquired 7 claims from Proprietary Mines, Limited and 1 from Cheminis Gold Mines, Limited. 1939: Sarcess completed 4 diamond drill holes through the ice on Bear Lake. 1998: FNX Mining Company Inc. drilled to complete a fence of drill holes at 200 m intervals. 1999: Surface stripping and channel sampling on the North Carbonate Gold Zone. 2002: Logging exposed a quartz-carbonate zone. 2003: 1491 m of diamond drilling by NFX. 2007-2008: Diamond drilling by Maximus Ventures. 2008-2011: Diamond drilling by Bear Lake Gold.
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Abitibi
Tectonic Assemblage: Timiskaming
Geological Age: Archean
Dec 16, 2011 (D Guidon) - from Armstrong et al. (2011) The consolidated rocks in the area are of Precambrian age. They consist of tightly-folded Archean volcanics and sediments intruded by syenite and unconformably overlain by relatively flat-lying Proterozoic sediments of the Cobalt series of the Huronian Supergroup. The economic mineral deposits are confined to the Archean rocks. Most of the volcanics are of Keewatin age. This is the oldest rock group, which consists of andesite interbedded with bands of tuff, agglomerate and rhyolite. These rocks are unconformably overlain by the Timiskaming sediments and volcanics. The Temiskaming andesite which generally underlies the sediments is confined to a belt south of the Larder Lake Break. The Timiskaming assemblage was followed by an orogenic period in which rocks were folded into tight synclines and anticlines, faulted, then intruded and altered by Algoman syenite and solutions. This orogeny caused the first movement on the Larder Lake Break. The carbonate solutions which permeated the fault zones were probably more or less contemporaneous with these intrusives. The combination of carbonatization and the release of free quartz produced brittle areas along the Larer Lake Break which fractured with a recurrence of movement along this fault. These fractures formed the passage ways for the quartz and gold solutions. After an extended period of erosion the Cobalt sediments were deposited. These Cobalt greywacke, arkose and conglomerate are unsorted and show little disturbance locally. There have been later movements both post ore and post Huronian on old faults. The Larder Lake Break is the most important structural feature in the area. It forms part of the fault zone which extends from Kirkland Lake, Ontario to Val-d’Or, Quebec, along or adjacent to which are situated most of the gold mines in this area.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Tholeiitic | Variolitic, Fragmental | Host |
|---|---|---|---|---|
| Ultramafic-Unsubdivided | 1 | Green-Carbonate | Host | |
| Vein | 3 | Quartz | Host |
Dec 16, 2011 (D Guidon) - Armstrong et al. (2011) The most prominent geological feature of the Larder Lake district is the persistent lithostructural belt known as the Larder Lake Break which strikes across the area in a N70°E direction. This belt is highly disturbed, steeply-dipping, and is composed mainly of intercalated metasediment and mafic to ultramafic volcanics. The Larder Lake Break marks the boundary between rocks of the Abitibi Geosyncline to the north and the rocks of the Temiskaming Supergroup to the south, and may be considered as a locus of major crustal adjustment during an early Precambrian period of geosynclinal collapse in the region. In the Larder Lake district, the break area is strongly anomalous in gold content, with higher concentrations of the metal occurring in roughly tabular areas of considerable extent. To date, approximately 13 million ounces of gold have been produced from such systems in the Larder Lake district. Across the Larder Lake Break, at least four dominantly sedimentary formations occur; these are marked by the presence of variably sheared green to gray carbonate rock, mudstone, sandstone and shale, which are often very highly auriferous. The Kerr formation, which is the most northerly and youngest of these, is also the largest, and has been the source of practically all of the gold production from the area. In the Kerr formation, the bulk of production was from heavily-veined green carbonate rock (“carbonate ore”) and cherty pyritic mudstone (“flow ore”), which occur repetitively within it. Other less important ore types known from the Kerr Addison Mine include auriferous chert, veined pyrite rock and veined syenite. The Kerr Addison Mine, and the Omega and Cheminis Mines, lie within the same geological formations and share common characteristics. The development of this highly productive formation is intermittent along the Larder Lake Break, and it should be kept in mind that the frequency, extent and tenor of gold zones within it may be expected to vary in different locations.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Pyrite | Economic | Gangue | ||||
| 1 | Carbonate | Alteration | Gangue | Carbonatization | 1 | Strong | Massive |
Dec 16, 2011 (D Guidon) - from Armstrong et al. (2011) Flow Type ore: Gold occurs with pyrite grains disseminated throughout volcano-sedimentary rocks having chemical composition of Fe-tholeiitic basalt. The host rocks generally consist of mixtures of detrital mud, fine to coarse mafic pyroclastic and basaltic flow-top material. Finely disseminated carbon and/or graphitic slips are usually present. Gold is quite homogeneously distributed. Visible gold is very rare. Usually gold concentration correlates positively with the degree of silicification, fineness of pyrite and concentration of pyrite. The term “flow ore” is a historical reference for this style of mineralization. Carbonate Type ore: Gold occurs as erratically distributed native gold in quartz veinlets, usually part of quartzcarbonate stockwork in fuchsitic to chloritic altered ultramafic volcanic rocks. The term “carbonate ore” is a historical reference for this style of mineralization. Sedimentary Type ore: Gold is found with fine-grained arsenopyrite and certain extremely fine-grained wispy masses of pyrite. Generally coarse pyrite is barren of gold. Gold is more erratically distributed in “flow ore”, but much less so than in “carbonate-ore”. Visible gold is rare. The host rock is intensely sericitized and silicified greywacke, or argillaceous siltstone. The term “sedimentary-ore” is a historical reference.
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Bear Lake | 2011 | Inferred Mineral Resource | 3750000 | NI 43-101 resource estimate June 2011 | Gold 5.69 g/t |
Book - Technical report and updated resource estimates on the Larder Lake property, Larder Lake Ontario for Bear Lake Gold Ltd., 112p.
Publication Number: Date: 2011
Author: Armstrong, T., Puritch, E. and Yassa, A.
Publisher Name: P&E Mining Consultants Inc.
Location: SEDAR
File - Resident Geologist file KL-2324
Publication Number: Date:
Author:
Publisher Name:
Location: Kirkland Lake RGP office
Part - Geology of McGarry and McVittie townships, Larder Lake area
Publication Number: ARV50-07 Page: 56 Date: 1998
Author: Thomson J.E.
Publisher Name: Ontario Dept. of Mines
Location:
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