Ontario Geological Survey
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MDI42D15SE00008
| Record Name(s) | Middleton - 1931, Middleton Property - 1931 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1983-May-05 |
| Date Last Modified | 2024-Apr-30 |
| Created By | |
| Revised By |
Primary Commodities: Granite
Township or Area: Walsh
Latitude: 48° 47' 22.2" Longitude: -86° 38' 53.87"
UTM Zone: 16 Easting: 525832.67 Northing: 5404115.65 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D15SE
Point Location Description: Outcrop
Location Method: Conversion from MDI
Access Description: GENERAL LOCATION:The property is located in the southeast corner of Walsh Township approximately 22 km west ofMarathon (Figure 25).ACCESS:The area near the C.P.R. can be reached in various ways. There is a trail to Middleton off Hwy. 17 nearthe Renshaw-Tripp Fe-Ti occurrence (approximately 1.5 km west of the Little Pic River). At Middleton,the tracks can be followed east for approximately 1 km. The area can also be reached by followingthe railroad tracks for approximately 1.5 km, starting in Neys Provincial Park. The Lookout Trail passes to within 100 m of the tracks. This method of access involves crossing the Little Pic Riverrailroad bridge (approximately 70 m long). At Neys Park there is a boat launch on the Little Pic River.This would allow looking at outcrop along the shore of Lake Superior. One would have to go inlandapproximately 275 m to reach the tracks at the occurrence.
1931: Mr. Wm. Morrison had seven claims staked for him by E.P.A. Phillips east of Middleton to encompass a black granite similar to the laurvikite at Peninsula. These claims were cancelled in 1933. 1946: Morrison restaked the ground, but they were again cancelled in 1949. All other staking and prospecting activity in the area involved the iron and titanium occurrences to the north of the tracks.
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (W Bellinger) - The claims are underlain by Fe-rich augite syenite (Walker et al. 1992) of the Proterozoic Coldwell alkalic complex. Geological mapping over the area was done by Puskas (1967) and recently by Walker et al. (1991, 1992, 1993). Walker et al. (1992) described the iron-rich augite syenite as follows: The iron-rich augite syenite appears to be a low angle sheet-like intrusion, which dips approximately 15 degrees toward the centre of the complex. It intrudes the basaltic xenoliths of the roof pendant and the Eastern and Western Gabbro, and it has inclusions of recrystallized amphibole quartz syenite. A variation in mineralogy from the bottom to the top through the sheet is present and consists of: fayalite-iron-rich, augite-magnetite syenite; iron-rich augite syenite; fayalite-iron-rich augite syenite; and amphibole syenite JOINTING: The jointing is irregular, but there are areas where large blocks could be obtained. COLOUR: The stone is a dark green to black and has long, lath-shaped crystals of feldspar which show a light blue iridescence. TEXTURE: The stone is medium to coarse grained.
| Rock Type | Rank | Composition | Texture | Relationship | Syenite | 1 | Iron-Rich Augite Syenite | Med To Coarse Gr | Host |
|---|
Dec 07, 2005 (W Bellinger) - COLOUR: The stone is a dark green to black and has long, lath-shaped crystals of feldspar which show a light blue iridescence. TEXTURE: The stone is medium to coarse grained. Iron-rich augite syenite, which forms the majority of the intrusion, typically contains iridescent tabular to lath-shaped feldspars with cryptoperthitic intergrowths and up to 30% interstitial, iron-rich augite. Variable amounts of fayalite, amphibole, aenigmatite and rare quartz occur in the subunit. The rock is generally black to olive-brown, coarse grained and massive. Large crystals of soda-orthoclase, often showing Carlsbad twinning, predominate with minor amounts of augite, olivine, magnetite, and apatite. The dark colour is due to iron-oxide staining the feldspar (Thomson 1933). Walker (1967) described the augite syenite as being composed of equal amounts of titanaugite and perthitic potash feldspar. Perthite shows remnants of finely twinned oligoclase within clear orthoclase. Hornblende and biotite replace part of the augite. Dark red-brown sphene is a common accessory mineral. The nepheline syenite pegmatite is composed of 80% perthitic alkalic feldspar, 10% hornblende and biotite in equal amounts,and 10% hydronepheline ('ranite'). The latter is likely an alteration product of natrolite.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Augite | Economic | Ore | ||||
| 2 | Fayalite | Economic | Ore | ||||
| 3 | Feldspar | Economic | Ore | ||||
| 4 | Amphibole | Economic | Ore | ||||
| 1 | Magnetite | Economic | Gangue |
Dec 07, 2005 (W Bellinger) - MINERALOGY: Walker et al. (1992) described the mineralogy of the iron-rich augite syenite: Iron-rich augite syenite, which forms the majority of the intrusion, typically contains iridescent tabular to lath-shaped feldspars with cryptoperthitic intergrowths and up to 30% interstitial, iron-rich augite. Variable amounts of fayalite, amphibole, aenigmatite and rare quartz occur in the subunit. The rock is generally black to olive-brown, coarse grained and massive. Large crystals of soda-orthoclase, often showing Carlsbad twinning, predominate with minor amounts of augite, olivine, magnetite, and apatite. The dark colour is due to iron-oxide staining the feldspar (Thomson 1933). Walker (1967) described the augite syenite as being composed of equal amounts of titanaugite and perthitic potash feldspar. Perthite shows remnants of finely twinned oligoclase within clear orthoclase. Hornblende and biotite replace part of the augite. Dark red-brown sphene is a common accessory mineral. The nepheline syenite pegmatite is composed of 80% perthitic alkalic feldspar, 10% hornblende and biotite in equal amounts,and 10% hydronepheline ('ranite'). The latter is likely an alteration product of natrolite. JOINTING: The jointing is irregular, but there are areas where large blocks could be obtained. COLOUR: The stone is a dark green to black and has long, lath-shaped crystals of feldspar which show a light blue iridescence. TEXTURE: The stone is medium to coarse grained.
Map - Precambrian Geology, Port Coldwell Complex, West Half
Publication Number: P3232 Scale: 1:20,000 Date: 1993
Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.
Publisher Name: Ontario Geological Survey
Location:
Mono - Dimensional Stone Occurrences and Deposits in Northwest Ontario
Publication Number: OFR5890 Page: 132-135 Date: 1994
Author: Hinz P., Landry R.M., Gerow M.C.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Heron Bay-White Lake area
Publication Number: ARV41-06.002 Page: 46-47 Date: 1998
Author: Thomson J.E.
Publisher Name: Ontario Dept. of Mines
Location:
File - Industrial minerals geologist files
Publication Number: IMF Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
MonoMap - Geology of the Jackfish-Middleton area, District of Thunder Bay
Publication Number: R050 Date: 1997
Author: Walker J.W.R.
Publisher Name: Ontario Dept. of Mines
Location:
Article - Geology of the Coldwell alkaline complex
Publication Number: MP157.018 Date: 1998
Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T.
Publisher Name: Ontario Geological Survey
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
Article - Geology of the Port Coldwell alkalic complex
Publication Number: MP160.019 Page: 108-120 Date: 1997
Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.
Publisher Name: Ontario Geological Survey
Location:
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