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Ontario Geological Survey
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MDI43B13SW00002
| Record Name(s) | Bravo-1 - 2000, Grid B1 - 1995, Monopros DDH B1-1-88 - 1988 |
|---|---|
| Related Record Type | Simple |
| Record Status | Prospect |
| Date Created | 1995-Mar-24 |
| Date Last Modified | 2021-Dec-14 |
| Created By | Q Unknown |
| Revised By | A Wilson |
Primary Commodities: Kimberlite, Diamond
Township or Area: BMA 527 834
Latitude: 52° 51' 51.72" Longitude: -83° 56' 17.81"
UTM Zone: 17 Easting: 302217 Northing: 5861227 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 43B13SW
Point Location Description: Drill collar for B1-1-88
Location Method: Based on Assessment
Access Description: Via helicopter from Attawapiskat.
1984-86: Monopros Ltd.: regional sediment sampling program. 1986-87: Monopros Ltd.: airborne magnetic survey. 1988-89: Monopros Ltd. - ground magnetic survey, 1 ddh (403 ft). 1995-97: Monopros Ltd. - core re-logging, ground geophysical survey, 6 reverse circulation drill holes (487.5 m), bulk sample (12,372.5 kg, (12.2 t) . 2006: DeBeers Canada Ltd. - airborne geophysics 2007: DeBeers Canada Ltd. - delineation drilling, microdiamond sampling
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-3261/2.11987 | 43B13SW0001 | 43B13SW0001 |
| T-4664/2.22711 | 43B12NW2005 | 43B12NW2005 |
Province: Paleozoic and Mesozoic Basins
Subprovince: Hudson Bay Basin
Geological Age: Mesozoic Geochronological Age: 179.4 MA Geochron. Age Ref.: OFR6019 p. 15
Dec 07, 2005 (A Wilson) - In the Attawapiskat area there are both Early Jurassic and Proterozoic kimberlites. The early Jurassic kimberlites are centred at approximately latitude 52 45N and 83 50 W. These kimberlites occur along the Winisk River fault trend and occur where this fault splays toward James Bay. The kimberlite distribution pattern is elongated northwest along the Winisk River fault, parallel to the NW trend of the Proterozoic Sutton Inlier (120 km north of Attawapiskat). The Early Jurassic kimberlites lie just south of the NE trending Cape Henrietta Maria Arch.
| Rock Type | Rank | Composition | Texture | Relationship | Kimberlite-Unsubdivided | 1 | Host |
|---|---|---|---|---|
| Limestone | 2 | Footwall |
Dec 07, 2005 (A Wilson) - The kimberlite is described as a hypabyssal macrocrystic kimberlite. Xenoliths of limestone are common, granitic (basement) xenoliths are also reported. No mantle xenoliths were observed. Portions of the kimberlite are described as being exceptionally altered. Olivine and altered phlogopite macrocrysts were observed in the drill core. Garnets were rare and often surrounded by reaction rims. The garnet geochemistry is a mixture of G-9 and G-10, with G-9 being the dominant chemistry. Chromite and ilmenite are prominent. The concentrate recovered from the bulk sample contained fresh and altered olivine, and rare garnet, clinopyroxene and ilmenite. From a depth of 103 m to the bottom of the hole, brecciated and fossiliferous limestone was intersected.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Diamond | Economic | Ore | ||||
| 2 | Pyrope | Economic | Ore | ||||
| 3 | Ilmenite | Economic | Ore | ||||
| 4 | Olivine | Economic | Ore |
Dec 07, 2005 (A Wilson) - A total of 6 macrodiamonds were recovered from the kimberlite. The grade was estimated to be 30 cpht.
Map - Known Kimberlites of Eastern Ontario
Publication Number: P3321 Scale: 1:50,000 Date: 1995
Author: Zalnieriunas R.V., Sage R.P.
Publisher Name: Ontario Geological Survey
MonoMap - Kimberlites of the Attawapiskat Area, James Bay Lowlands, Northern Ontario
Publication Number: OFR6019 Scale: Date: 2000
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Article - Alkalic rock, carbonatite and kimberlite complexes of Ontario, Superior province
Publication Number: SV04-01.018 Scale: Date: 1997
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office