Ontario Geological Survey
Permanent Link to this Record:
MDI42B01NE00027
| Record Name(s) | Nat River - 1956 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1992-Sep-09 |
| Date Last Modified | 2023-Mar-24 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Township or Area: Penhorwood
Latitude: 48° 9' 20.21" Longitude: -82° 2' 33.18"
UTM Zone: 17 Easting: 422465.07 Northing: 5334121.81 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 42B01NE
Point Location Description: Small outcrop near area more thoroughly tested by drilling.
Location Method: Field Visit with GPS
Access Description: Access is easy as the Penhorwood Main Haul road which branches of the Kenogaming Main Haul road crosses the iron formation.
1946 Reconnaissance geological mapping by Kalbrook Mining (Penko) over the area did not report any outcrop in the vicinity of the showing. 1956 Canadian Johns Manville geologically mapped the iron formation and the area was covered with magnetic survey during the course of an asbestos exploration program. This work was followed up with a six hole diamond drill program (860m), which intersected pyritic iron formations in several holes. 1959 Kukatush Mining commissioned a magnetic survey over the iron formation in their search for iron ore. This was followed by a diamond drill program which consisted of 14 holes drilled over a seven year period, six in three sections. From composite samples taken from the drill core grade estimates were made which averaged 29% total iron. It was also estimated that 27 million tonnes existed in every 30m below surface. 1983 - 1984: Sheppard, R.J. – AEM, AMag. 1990: Morin, D. – Str, Tr, Assays. 1995: Durham, R.B. – DD – 10 – 1776m, Assays. 1998: Minesource Exploration Ltd. – Assays, DD – 8 – 1841m. 2005: Golden Chalice resources Inc. – AEM, AMag. 2007: Golden Chalice Resources Inc. – AEM, AMag. 2007 – 2008: Golden Chalice Resources Inc. – IP, Mag, EM, Lc. 2008: Golden Chalice Resources Inc. – DD – 2 – 600m. 2012: Rogue Iron Ore Corp. – Mag.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-506 / 63.1669 | 42B01NE0126 | 42B01NE0126 |
| T-669 / 63.1052 | 42B01NE0125 | 42B01NE0125 |
| T-669 / 16 | 42B01NE0133 | 42B01NE0133 |
| T-669 / 63.4122 | 42A04NW8545 | 42A04NW8545 |
| T-2799 / 2.8066 | 42B01NE0105 | 42B01NE0105 |
| T-3774 / | 42B01NE0040 | 42B01NE0040 |
| T-4067 / 2.18867 | 42B01NE2006 | 42B01NE2006 |
| T-5457 / 2.33264 | 20000002366 | 20000002366 |
| T-5632 / 2.37307 | 20000002719 | 20000002719 |
| T-5708 / 2.38179 | 20000003411 | 20000003411 |
| T-5787 / 2.39760 | 20000003351 | 20000003351 |
| T-6432 / 2.51964 | 20000007273 | 20000007273 |
| T-2726 / 63.5980 | 42B04NW0102 | 42B04NW0102 |
| T-2799 / 2.6342 | 42A04NW0028 | 42A04NW0028 |
| T-506 / 63.469 | 42B01NE0124 | 42B01NE0124 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Swayze
Tectonic Assemblage: Muskego-Reeves
Geological Age: Neoarchean
Metamorphism Type: Regional
Metamorphism Grade: Greenschist
Dec 07, 2005 (S Fumerton) - Small scale structures are common in the iron formation and include:- 1) soft sediment brecciation of the chert horizons especially in the chert - sulphide facies, 2) small scale folding in which the limbs of the silicate and oxide facies have been attenuated, and 3) faulting. On the large scale the iron formation has been cut by the Nat River shear zone which strikes northeast with minor offsets. Another parallel shear zone the extension of the Hardiman Bay Fault is adjacent to the northwest contact of the iron formation and may be responsible for some of the fault duplication.
Feb 29, 2016 (A Wilson) - The deposit occurs within the Nat River iron formation on the northern limb of the Hanrahan Lake anticline. The continuity of the Nat River iron formation has been largely inferred from magnetic surveys and details have not been established. Diamond drilling clearly indicates the deposit area is underlain by a number of iron formation intersections. A possible interpretation is that of a Z-shaped, isoclinal drag fold on the north limb of an F1 anticline. Alternative interpretations are repetitions by faulting or a number of separate iron formation horizons.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Banded Iron Formation | Host |
|---|---|---|---|---|
| Sandstone | 2 | Arenite | Near | |
| Claystone | 3 | Argillite | Near | |
| Felsic lava flow-unsubdivided | 4 | Rhyolite | Adjacent |
Dec 07, 2005 (S Fumerton) - The Nat River iron formation marks the contact between and a felsic volcanic complex in the core of a fold and a mafic metavolcanic sequence. The continuity of the iron formation has largely been inferred from magnetic surveys and details have not been established. Therefore it is not known how many horizons exist and whether are continuous or en-echelon but mention is made of upper and lower regional iron formation horizons. However, it is possible that these upper and lower regional horizons may be fault duplications. The interpretation is complicated by the carbonate facies which are not magnetic. The iron formation consists predominantly of a lean, finely banded magnetite and chert facies. In addition magnetite - chert - silicate, chert - pyrite, chert - siderite, massive pyrite - pyrrhotite, and chert - pyritic graphitic argillite facies are present in lesser amounts and variably distributed. These facies are intercalated with each other on the decimetre and metre scale From sedimentary channel features in the iron formation tops are to the northwest.
Feb 29, 2016 (A Wilson) - The iron formation consists predominantly of lean, finely banded magnetite and chert facies iron formation. In addition, sulphide, silicate, carbonate and graphite facies portions are locally present in lesser amounts. The oxide-facies portions typically consist of thin lean beds of black chert containing magnetite interbedded with white non-magnetic chert on a centimeter scale. The sulphide-facies portions occur as beds of disseminated to massive pyrite and minor pyrrhotite up to 20 cm thick interbedded with chert and/or graphitic argillite.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Magnetite | Economic | Ore | ||||
| 2 | Quartz | Economic | Ore | ||||
| 3 | Amphibole | Economic | Ore | ||||
| 1 | Pyrrhotite | Economic | Gangue | ||||
| 2 | Pyrite | Economic | Gangue | ||||
| 3 | Carbonate | Economic | Gangue |
Feb 29, 2016 (S Fumerton) - The oxide facies of the iron formation typically consist of very lean thin beds of black chert containing magnetite interbedded with white non-magnetic chert, typically on a centimetre scale. At the outcrop used as a reference point these beds are thicker than elsewhere and marginally richer in magnetite. The sulphide facies occur in two modes, interbedded on the centimetre scale with chert in which case the chert is commonly brecciated, and secondly in massive sulphide beds up to 20cm thick. In both cases pyrite is the main sulphide which occurs in subhedral medium grains with minor amounts of pyrrhotite and trace amounts of chalcopyrite. Sulphides have been commonly remobilised during the regional metamorphism and deformation and also occur in small veins cutting other phases. At the nose of the regional fold these sulphide horizons are thicker. In the few outcrops exposed the sulphide facies horizons together with the graphitic argillite - pyritic horizons bracket the oxide facies.
Dec 07, 2005 (A Wilson) - The average iron concentration for the deposit is 29%.
| Rank | Classification |
|---|---|
| 5 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 5 | Stratiform |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular | 9999 | 30 | N/A | N/A |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Nat River Iron Formation | 1966 | Unclassified | 27432000 | GR 297, P. 53 | Iron 29 Percent |
File - Resident Geologist files T-145
Publication Number: Date:
Author:
Publisher Name:
Location: Timmins RGP office
Map - Foleyet sheet, districts of Sudbury, Cochrane and Algoma, geological compilation series
Publication Number: P0283 Scale: 1:126,720 Date: 1997
Author: Carlson H.D.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Sudbury Timmins Algoma Mineral Program, Project 1: mineral inventory of the Sudbury-Timmins-Sault Ste. Marie region, Ontario
Publication Number: GSC OF 1087 Date: 1985
Author: Rose, D.G.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/129999
Map - Penhorwood Township, District of Sudbury
Publication Number: P0419 Scale: 1:15,840 Date: 1997
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Iron ranges of northern Ontario
Publication Number: ARV12.013 Page: 315 Date: 1998
Author: Miller W.G.
Publisher Name: Ontario Bureau of Mines
Location:
Map - Geological series, Operation Chapleau, Horwood Lake sheet, districts of Algoma, Cochrane, and Sudbury
Publication Number: P0673 Scale: 1:126,720 Date: 1997
Author: Thurston P.C., Siragusa G.M., Sage R.P.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Part - Groundhog River area
Publication Number: ARV33-06.001 Page: 10-12 Date: 1998
Author: Todd E.W.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Penhorwood and Kenogaming townships, Sudbury District
Publication Number: M2231 Scale: 1:31,680 Date: 1972
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Precambrian Geology, Northern Swayze Greenstone Belt
Publication Number: M2627 Scale: 1:50,000 Date: 1995
Author: Ayer J.A.
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist files 1980, air photos
Publication Number: Date: 1996
Author:
Publisher Name:
Location:
MonoMap - Geology of the Kukatush-Sewell Lake area, District of Sudbury
Publication Number: R097 Page: 23-26 Date: 1972
Author: Milne V.G.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of the Chapleau area, districts of Algoma, Sudbury, and Cochrane
Publication Number: R157 Date: 1977
Author: Thurston P.C., Siragusa G.M., Sage R.P.
Publisher Name: Ontario Division of Mines
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Page: 355-356 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: 567-569 Date: 1995
Author: Fumerton S.L., Houle K.A.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Precambrian Geology, Northern Swayze Greenstone Belt
Publication Number: R297 Page: 53 Date: 1995
Author: Ayer J.A.
Publisher Name: Ontario Geological Survey
Location:
Book - Penhorwood Township - unpublished GDIF
Publication Number: GDIF Date: 1993
Author: Resident Geologist Staff
Publisher Name:
Location: Timmins RGP
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