Ontario Geological Survey
Permanent Link to this Record:
MDI000000000275
| Record Name(s) | AGM Zone - 2004 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2007-Mar-27 |
| Date Last Modified | 2022-Jun-06 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: McVicar Lake Area
Latitude: 51° 32' 58.07" Longitude: -91° 28' 35.81"
UTM Zone: 15 Easting: 605624.999 Northing: 5712029.996 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52O11SW
Point Location Description: Assessment file map (McKay 2004).
Location Method: Data Compilation
1950: Chellow Gold Mines Ltd. Conducted geological mapping, trenching and diamond drilling in the Lower McVicar Lake area. 1959-1961: Kenlew Mines Ltd conducted geological mapping, stripping, trenching and diamond drilling in the lower McVicar Lake area and the area to the east of McVicar Lake. 1968-1969 New Jersey Zinc Exploration Company (Canada) Limited conducted geological mapping, geophysics, trenching and limited diamond drilling for VMS mineralization in the area north of north of McVicar Lake. 1971 Hoey Syndicate conducted geological mapping, trenching and geophysics for Cu-Ni-PGE mineralization in the lower half of the McVicar Lake area. 1977-1981, 1987, 1991 Cominco Ltd conducted extensive airborne geophysical surveys as well as diamond drilling over the McVicar Lake and Andy lake areas, well as limited diamond drilling in McVicar and Cannon Lake areas for gold and base metals. 1985-1994 Utah Mines, later BHP-Utah Mines, and then simply BHP conducted extensive grid mapping, geophysics and diamond drilling on the area surrounding McVicar Lake resulting in the discovery of the Altered Zone and Lower McVicar Lake structural zones and several associated gold showings. Utah Mines also conducted extensive work in the western Lang Lake area. 2001-2003 Prospector Consolidated Inc and Continuum Resources Ltd, conducted extensive trenching and limited diamond drilling for gold on the old BHP-Utah Mines property in the McVicar Lake area.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.15280 | 52O11SW9400 | 52O11SW9400 |
| 63.5247 | 52O11SE0080 | 52O11SE0080 |
| 2.18309 | 52O11SW2001 | 52O11SW2001 |
| 2.27178 | 52O11SW2003 | 52O11SW2003 |
| W9430-00033 | 52O11SW0014 | 52O11SW0014 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lang Lake
Geological Age: Neoarchean
Mar 27, 2007 (Mark Puumala) - Stott and Corfu (1991) describe the Lang Lake greenstone belt as being dominated by tholeiitic basalt flows and calc-alkalic pyroclastic deposits, with the eastern portion of the belt containing a significant clastic metasedimentary sequence that also includes iron formation horizons. The supracrustal rocks of this belt have been provisionally assigned to the Confederation Assemblage by Stott and Corfu (1991) based on a single age determination from a dacitic tuff in the lowermost (i.e., interpreted to be oldest) portion of the supracrustal rock sequence. The entire belt has been isoclinally folded into an east-trending and east-plunging syncline (Thomas 1988). Thomas (1988) also indicates that the belt contains two significant intrusions, including an east-west trending mafic stock in the Sor-McVicar Lakes area, and a later north-south trending felsic intrusion in the Shonia-McVicar Lakes area. The mafic intrusion has a number of Cu-Ni-PGE occurrences that have been documented near its northern contact, while the felsic intrusion hosts several gold occurrences. The dominant structural feature in the area is the Bear Head Fault Zone, which is located immediately to the southwest. This is an approximately northwest-southeast striking, regional-scale, dextral shear zone that has been classified by Stott and Corfu (1991) as a transcrustal megafault. This fault zone extends approximately 515 km from Lake Winnipeg to the northern boundary of the Meen-Dempster Greenstone Belt (Osmani and Stott 1988). Two additional WNW-ESE trending deformation zones referred to as the Lower McVicar Fault and Altered Zone Fault (McKay 2004) are also present in the area and are associated with a number of gold occurrences. Fumerton (1997) suggests a relationship between the Altered Zone Fault and the axial plane of the regional syncline. Fumerton (1997) indicates that supracrustal rocks between the Bear Head and Lower McVicar Faults have been folded into sigmoidal S-folds, and that a number of splay faults also exist in this area. The geometry of these structures has been interpreted as being consistent with a dextral sense of displacement.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Gabbro | 2 | Anorthositic Gabbro | Sheared | Contains |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| Carbonate | Alteration | Carbonatization | 1 | ||||
| Fuchsite | Alteration | 2 |
Mar 27, 2007 (Mark Puumala) - The AGM or apple green mica zone is described by Waldie (1993a) as a zone of sheared anorthositic gabbro with abundant AGM alteration and quartz veining. The surface exposures of the AGM Zone (covering a strike-length >33 m) consist of several AGM alteration zones up to 2.5 m wide and sheared, contorted quartz veins that are up to 1.3 m in width. Waldie (1993b) also indicates the presence of carbonate breccia and traces of pyrite mineralization in this zone. Mapping by Waldie (1993a) indicates that the mineralized shear zone is oriented approximately 100/80. The most notable assay reported by Waldie (1993a) from this zone was 8.9 g/t Au from a grab sample collected from a 10 cm wide quartz vein in the westernmost stripped area. A follow-up diamond drilling program (Waldie 1993b) encountered the mineralized zone in three drill holes, but did not return any significant gold assays.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Article - Uchi subprovince
Publication Number: SV04-01.006 Page: 145-236 Date: 1997
Author: Stott G.M., Corfu F.
Publisher Name: Ontario Geological Survey
Location:
Article - Regional-scale shear zones in Sachigo Subprovince and their economic significance
Publication Number: MP141.006 Page: 53-67 Date: 1997
Author: Osmani I.A., Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office