Ontario Geological Survey
Permanent Link to this Record:
MDI000000000693
| Record Name(s) | Blackbird One Deposit - 2010, Blackbird One - 2008, Noront DDH NOT-08-1G43 - 2008, Double Eagle Property - 2003, Anomaly AT2 - 2003 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 2009-Aug-11 |
| Date Last Modified | 2022-Jan-05 |
| Created By | |
| Revised By |
Primary Commodities: Chromium, Iron
Secondary Commodities: Nickel, Copper, Platinum, Palladium
Township or Area: BMA 526 862
Latitude: 52° 43' 36.53" Longitude: -86° 19' 2.52"
UTM Zone: 16 Easting: 546100 Northing: 5842100 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 43D09NW
Point Location Description: precise
Location Method: Data Compilation
Access Description: Access by air from Nakina
2003-2012: Noront Resources Ltd. - airborne geophysics, ground geophysics, gravity survey, DD-198 metallurgical testing
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.37704 | 20000002819 | 20000002819 |
| 2.42415 | 20000004175 | 20000004175 |
| 2.42568 | 20000000294 | 20000000294 |
| 2.45972 | 20000004813 | 20000004813 |
| 2.46316 | 20000005642 | 20000005642 |
| 2.29682 | 20000000351 | 20000000351 |
| 2.29683 | 20000000444 | 20000000444 |
Province: Superior
Subprovince: Sachigo
Terrane: North Caribou
Domain: Oxford-Stull
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Dunite | 1 | Metadunite | Host |
|---|---|---|---|---|
| Harzburgite | 2 | Metaharzburgite | Host |
Dec 02, 2010 (A Wilson) - Diamond drilling into the conductive anomalies confirmed that the magnetic anomaly corresponds to a large body of metadunite and metaharzburgite that has been altered to magnetite-rich tremolite, serpentinite and talc-carbonate rock. The chromite mineralization stratigraphically lies approximately 50 m lower in depth from the Eagle Two Prospect. A simplified lithological succession of the Ring of Fire intrusion from the base upwards comprises: talc-altered peridotite/dunite, serpentinized dunite/peridotite with chromite bands and layers, peridotite with lesser chromite, talc-tremolite schist and gabbro. The stratigraphy has been overturned and is now dipping roughly 60° towards 335° azimuth. There is geophysical evidence of folding to the southwest of the deposit. Intense faulting and associated alteration cuts through the southern part of the Blackbird 2 trending north-northeast and is likely sub-vertical. The fault appears to widen between the Blackbird 2 zone 2 (BB2-2) chromite and the southernmost massive chromite layer (BB2-4)
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chromite | Economic | Ore | ||||
| 2 | Magnetite | Economic | Gangue |
Aug 28, 2009 (A Wilson) - The mineralization consists of massive chromitite layers interbedded with chromite-rich metadunite, now entirely replaced by talc carbonate minerals, chromite, and minor ferrochrome overgrowths. Several drill holes intersected massive chromitite mineralization. The layers vary widely in thickness, from centimetres on the margins of the Blackbird One deposit to continuous massive chromitite intersections approaching true thicknesses of 30 metres at its central axis. The chromite mineralization shows several different textural and structural styles. In the host ultramafic silicate rocks there is abundant chromite which stands out in drill core as isolated or disseminated submillimetric black euhedra in the white talc-carbonate host rock. The modal abundance of chromite varies from less than 1% to as much as 25% and locally shows evidence of primary layering. The mineralization is thickest along an axis plunging steeply to the northwest from a near-surface expression near the southeast extremity of the drill pattern. To the southwest of this axis the mineralization thins rapidly to nothing. When the chromite abundance reaches 25%, the rock typically shows antinodular texture, with submillimetre chromite grains forming a closely packed matrix around larger pseudomorphs of olivine. Assays from NOT-08-1G17 returned 39.1% Cr2O3 over 49.4 m, NOT-08-1G24 returned 40.4% Cr2O3 over 57.5 m including 42.3% Cr2O3 over 40.5 m. Assays for NOT-08-1G20 returned 0.01% Cu, 0.16% Ni, 0.12 g/t Pd, 0.19 g/t Pt, 0.02 g/t Au, 28.2% Cr2O3 over 17.6 m.
| Rank | Classification |
|---|---|
| 1 | Mafic-Ultramafic Intrusion |
| 2 | Magmatic |
| Rank | Characteristic |
|---|---|
| 1 | Layered |
| 2 | Stratiform |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular | 125 | 500 |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Blackbird Deposit | 2012 | Inferred Mineral Resource | 23500000 | NI43-101 12/31/2011 | Inferred: 23.5 Mt @ 33.1% Cr2O3 (cut-off grade of 30% Cr2O3) | Chromium 33.14 Percent |
| Blackbird deposit | 2012 | Measured + Indicated Resource | 20500000 | NI43-101 12/31/2011 | Measured and Indicated: 20.5 Mt @ 35.76% Cr2O3 (Cutoff grade of 30% Cr2O3) | Chromium 35.76 Percent |
| Blackbird 1, BB1 Zone | 2010 | Indicated Mineral Resource | 1895000 | Gowans et al. NI 43-101 report 2010 | Chromium 36.56 Percent |
Map - Precambrian Geology of the Hudson Bay and James Bay Lowlands Region Interpreted from Aeromagnetic Data-East Sheet
Publication Number: P3598-REV Scale: 1:500,000 Date: 2008
Author: Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
Publication - Press releases Noront Resources Ltd.
Publication Number: Date: 2008
Author: Noront Resources Ltd.
Publisher Name:
Location: Timmins RGO files
Map - Precambrian Geology of the Hudson Bay and James Bay Lowlands Region Interpreted from Aeromagnetic Data-South Sheet
Publication Number: P3599-REV Scale: 1:500,000 Date: 2009
Author: Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
Publication - Technical Report on the Mineral Resources Estimate for the Back Bird Chrome Deposits, James Bay Lowlands, 188 p
Publication Number: NI 43-101 Date: 2010
Author: R. Gowans, J. Spooner, A. J. San Martin, C. Murahwi
Publisher Name:
Location: Timmins RGO
Publication - Technical report,preliminary economic assessment McFaulds Lake Property, Eagle's Nest Project, James Bay Lowlands, Ontario, 136p.
Publication Number: NI 43-101 Date: 2010
Author: S. Baker, H. Burgess, R. Gowans, G. Greenough, C. Jacobs, C. Murahwi and P.
Publisher Name:
Location: Timmins RGO
Mono - Mineral Deposits of Northern Ontario, North of Latitude 49° 30'
Publication Number: OFR6242 Date: 2009
Author: Stott G.M., Josey S.D.
Publisher Name: Ontario Geological Survey
Location:
Publication - Technical Report on the Mineral Resources Estimate for the Back Bird Chrome Deposits, McFaulds Lake Property, James Bay Lowlands, 186 p
Publication Number: NI 43-101 Date: 2011
Author: C. Murahwi , A. J. San Martin, R. Gowans, J. Spooner
Publisher Name:
Location:
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