Ontario Geological Survey
Permanent Link to this Record:
MDI000000002048
| Record Name(s) | Prairie Lake Para-Lamproite - 2011, Prairie Lake Diamond - 2008 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2017-Jan-23 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Andrew Tims |
| Revised By | Therese Pettigrew |
Primary Commodities: Diamond
Township or Area: Killala Lake Area
Latitude: 49° 0' 22.06" Longitude: -86° 45' 29.95"
UTM Zone: 16 Easting: 517675 Northing: 5428165.01 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42E02SE
Point Location Description: GPS
Location Method: Based on Assessment
Access Description: Access is by helicopter or float plane.
2005: Ripple Lake Diamonds Inc. completed a high-resolution helicopter magnetic and electromagnetic survey of the area of the occurrence. 2010: R. Wahl staked the area of the occurrence and sampled lamprophyre boulders along a small lake. 2011: Canadian International Minerals Inc. optioned the claims and completed prospecting, rock sampling, spectrometer (radiometric) surveys, soil sampling, trenching and channel sampling. 2012-2013: R.Wahl conducted prospecting, hand stripping, geological mapping and rock sampling. Petrographic study carried out by Dr. R. Mitchell. Rio Tinto processed a 325 kg sample from the lamproite.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.53650 | 20000008787 | 20000008787 |
| 2.50419 | 20000007251 | 20000007251 |
| 2.31534 | 20000001165 | 20000001165 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Lamprophyre-Unsubdivided | 1 | Para Lamproite |
|---|
Dec 06, 2018 (Andrew Tims) - The lamproite intrudes a highly magnetic granite along a northwest structure parallel to a diabase and a awarm of melagabbro dykes. The host granite is strongly altered by carbonate. The lamproite is magnetic, foliated and displays a well developed fracture pattern. Xenolithes are positive weathering features and reach up to 10x20 cm in size. In addition to the the lakeshore outcrop on the southwest side of the lake a second lamproite dyklet, 30 cm, is prsent along strike at the west end of the lake. This rock has some petrographic affiinities with bonafide lamproites yet the pyroxenes are more aluminous. Many of the micas form reaction rims around former olivine. This is common feature of olivine reacting with a potassic melt, however the groundmass is notably poor in mica and Na-Ca-zeolites are present. This diverse mineralogy is the result of magma mixing in the mantle.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Diamond | Economic | Ore | ||||
| 2 | Garnet | Economic | Ore |
Jan 23, 2017 (Andrew Tims) - A 325 kg sample taken from the Para Lamproite returned three micro diamonds - G 10 - G9 - G3 garnets and other diamond indicator minerals.
| Rank | Classification |
|---|---|
| 1 | Mafic-Ultramafic Intrusion |
| Rank | Characteristic |
|---|---|
| 1 | Intrusive |
Date: Nov 15, 2012
Geologist: Mark Puumala
Notes: Completed a field map of outcrops about lake.
Date: Nov 17, 2012
Geologist: Dorothy Campbell
Notes: Helicopter in with R. Wahl and circumvented the lake mapping and sampling
Data - Ontario Airborne Geophysical Surveys, Magnetic and Gamma-Ray Spectrometric Data, Grid and Profile Data (ASCII format) and Vector Data, Lac des Mille Lacs-Nagagami Lake Area
Publication Number: GDS1078A Scale: Date: 2015
Author: Ontario Geological Survey
Publisher Name: Ontario Geological Survey
Map - Precambrian Geology Compilation Series - Longlac Sheet
Publication Number: M2667 Scale: 1:250,000 Date: 2003
Author: Johns G.W., McIlraith S.J., Stott G.M.
Publisher Name: Ontario Geological Survey
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office