Ontario Geological Survey
Permanent Link to this Record:
MDI41O10NW00008
| Record Name(s) | North Greenlaw Iron Formation - 1968 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1994-May-30 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Secondary Commodities: Gold
Township or Area: Greenlaw
Latitude: 47° 43' 57.61" Longitude: -82° 47' 35.4"
UTM Zone: 17 Easting: 365550.21 Northing: 5288145.44 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 41O10NW
Point Location Description: Outcrop of iron formation along north shore of Ridout Lake.
Location Method: Field Visit with GPS
Access Description: Access is by way of Highway 667, south of Chapleau, between Highway 129 and the town of Sultan. Take the Kormak Rd. north past the Canadian National Railway line. A logging road leads north then east into Greenlaw Twp. The area north of Ridout lake is accessible by ATV along a small trail that follows the north shore of Ridout Lake.
1980-81: Granges Exploration Ltd. drilled 7 holes in an area to the west of Ridout Lake for a total of 504 m. All but two of these holes intersected iron formation. Other rock types include intermediate to felsic volcanics. 1983: Noranda Exploration drilled two holes into iron formation to the west of Ridout Lake. The combined length of the drill holes was 469 m. Anomalous metal values as high as 0.011 oz./t Au and 1.16% Zn were reported in core assays. 1984: Noranda Exploration conducted a magnetic and electromagnetic survey over claims along the north shore extending to the west and the south shore of Ridout Lake. Noranda also conducted a geological mapping and geochemical humus survey over an area that include Ridout Lake and Little Ridout Lake to the east of the iron formation exposure. Humus sample were analyzed for Au but only discontinuous single anomalies were uncovered. Aerodat Limited flew a combined helicopter borne magnetic, electromagnetic and VLF survey for Kelly Kerr (John Larche Property) over the west end of Ridout Lake which included the showing. 1985: Granges Exploration Ltd. conducted a soil geochemical survey due west of Ridout Lake over a block of 11 claims. No interesting anomalies were discovered and further work was not recommended. 1993: Cameco Corporation carried out a geological mapping and VLF electromagnetic survey over the area in the search for gold. No significant gold values were obtained in this program.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-2823 / 2.7262 | 41O10NW0015 | 41O10NW0015 |
| T-2854 / 2.9170 | 41O10NE0019 | 41O10NE0019 |
| T-3641 / 2.16301 | 41O10NW0006 | 41O10NW0006 |
| T-3641 / 2.15494 | 41O10NW0012 | 41O10NW0012 |
| T-2823 | 41O10NW9064 | 41O10NW9064 |
| T-2854 / 2.6951 | 41O10NE0024 | 41O10NE0024 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Swayze
Tectonic Assemblage: Ridout
Geological Age: Neoarchean Geochronological Age: 2730+/- 3 MA Geochron. Age Ref.: OF 3384E
Metamorphism Type: Regional
Metamorphism Grade: Greenschist
Dec 07, 2005 (K Houle) - Iron formation is highly sheared and schistose which has removed any obvious stratification. The contact between the iron formation and the surrounding rock is described as gradational. The schistosity has been measured as striking east-west and dipping steeply to the north.
| Rock Type | Rank | Composition | Texture | Relationship | Carbonate Ironstone | 1 | Carbonate Facies? | Banded Iron Formation | Host |
|---|---|---|---|---|
| Intermediate lava flow-unsubdivided | 2 | Andesite | Adjacent |
Dec 07, 2005 (K Houle) - The iron formation along the north shore of Ridout Lake is described as being folded, sheared, brecciated and closely associated with schistose intermediate to felsic volcanics. The iron formation is said to be cross cut by numerous small irregular quartz veins and the most common minerals present are quartz, calcite, siderite, limonite, pyrite and epidote.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Hematite | Economic | Ore | ||||
| 3 | Limonite | Economic | Ore | ||||
| Limonite | Alteration | Unknown | 1 | Strong | Replacement |
Dec 07, 2005 (K Houle) - It has been mentioned that quartz calcite, siderite, limonite, pyrite and epidote are common constituents of the iron formation (Donovan, 1968).
Jul 25, 2013 (A Wilson) - Grab samples taken by the OGS in 1994 returned an assay of 0.01 g/t Au and 0.1 g/t Ag from a sample of the iron formation.
| Commodity | Analytical Method | Digestion Method | Result | Unit | Limit | Qualifier |
|---|---|---|---|---|---|---|
| Copper | Unknown | .0025 | % | |||
| Gold | Unknown | .01 | ppm | |||
| Lead | Unknown | .0001 | % | |||
| Molybdenum | Unknown | .0001 | % | |||
| Nickel | Unknown | .0014 | % | |||
| Silver | Unknown | .1 | ppm | |||
| Zinc | Unknown | .0018 | % |
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 1600 | 120 | 270 | 70 | N/A | N/A |
Date: Jun 18, 1994
Geologist: K Houle
Notes: Iron formation sequence to the north of Ridout Lake just south of an ATV trail was visited. What at first glance appeared to be a ridge of outcrop consisted mainly of float and boulders. Outcrop was located at the bottom of the ridge on the lake side and consisted of interbedded silicified sediments and interbedded chert. Unit at this location was found to be highly sheared and schistose with cross cutting bands of dark brown material 1-2 cm. in width. Unit is also cut by irregular white quartz and trace to 2% fine pyrite was observed at this location.
Map - Tooms and Greenlaw townships, Sudbury District
Publication Number: M2121 Scale: 1:31,680 Date: 1997
Author: Donovan J.F.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Preliminary report on Woman river and ridout map areas, Sudbury district, Ontario; Geological Survey of Canada, Memoir 157
Publication Number: GSC Mem 157 Page: 24-25 Date: 1929
Author: Emmons, R.C. and Thomson, E.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/100840
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: 41O-79 Date: 1985
Author: Rose, D. G.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/129999
Map - Geology, Swayze greenstone belt, Sultan, Ontario
Publication Number: OF 3384E Scale: 1:50,000 Date: 1999
Author: Heather, K B; Shore, G T
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/210453
Part - Geology of the Swayze gold area
Publication Number: ARV43-03.001 Page: 11-13 Date: 1998
Author: Rickaby H.C.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of Halcrow-Ridout lakes area, District of Sudbury
Publication Number: R063 Page: 17-19, 34 Date: 1968
Author: Donovan J.F.
Publisher Name: Ontario Dept. of Mines
Location:
File - Resident Geologist files 1980, air photos
Publication Number: Date: 1996
Author:
Publisher Name:
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Page: 336 Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
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: 141-143 Date: 1995
Author: Fumerton S.L., Houle K.A.
Publisher Name: Ontario Geological Survey
Location:
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