Ontario Geological Survey
Permanent Link to this Record:
MDI000000002219
| Record Name(s) | Plato Site 21A - 2017, Good Hope - 2015 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2018-Sep-24 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Therese Pettigrew |
| Revised By | Therese Pettigrew |
Primary Commodities: Niobium
Secondary Commodities: Phosphate
Township or Area: Killala Lake Area
Latitude: 49° 0' 40.65" Longitude: -86° 43' 34.61"
UTM Zone: 16 Easting: 520016 Northing: 5428746.99 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42E02SE
Point Location Description: Sample 1077388 from AFRI 20000015102
Location Method: Based on Assessment
Access Description: The property can be accessed via the Deadhorse Creek Road.
2015: R. Wahl optioned the property to MDN Inc., who carried out prospecting, mapping, trenching, and sampling. 2017: Plato Gold optioned the property and carried out prospecting, mapping, and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.56640 | 20000014693 | 20000014693 |
| 2.58157 | 20000015102 | 20000015102 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Geological Age: Archean
Sep 24, 2018 (Therese Pettigrew) - The Midcontinent Rift represents an aborted or failed rift resulting from an upwelling mantle plume during Mesoproterozoic time at ~1.1 Ga. The rift is characterized by a large volume of igneous material which includes the tholeiitic volcanic rocks and related rhyolite and granophyre of the Keweenawan Supergroup, mafic-ultramafic sills and intrusions of the Duluth Complex and alkaline and carbonatite intrusions of Ontario. Within the Superior Province, numerous alkaline and carbonatitic rocks are distributed along the Trans-Superior Tectonic Zone (TSTZ). Four alkaline rock carbonatite complexes have been identified along this Zone: Coldwell, Chipman, Killala Lake and Prairie Lake. The Coldwell Complex is one of the largest alkaline complexes in the world with an area of ~490 km2 and is composed of subalkaline and alkaline gabbro, ferroaugite syenite, diverse contaminated syenites, ferroaugite syenite and A-type quartz syenites. The Killala complex consists of troctolite, gabbro, monzonite, syenite, nepheline monzonite-syenite and mafic-syenite dykes. Both the Coldwell Complex and the Killala Lake complex do not contain carbonatites, whereas Chipman Lake and Prairie Lake complexes do contain carbonatites (AFRI 20000015102).
| Rock Type | Rank | Composition | Texture | Relationship | Carbonatite-Unsubdivided | 1 | Is |
|---|---|---|---|---|
| Ijolite | 2 | Ijolite | Is | |
| Terrigenous-Clastic-Unsubdivided | 3 |
Sep 24, 2018 (Therese Pettigrew) - The Good Hope Property claims surround the Prairie Lake Comlex, but the center of the Prairie Lake Complex is not included in the Property. The Prairie Lake Complex is circular with an approximate surface area of 8.8 km2 and is topographically located on a circular hill surrounded by low lying marshy ground. The Prairie Lake Complex corresponds to an aeromagnetic high anomaly. The Good Hope Property consists of paragneiss and metasedimentary bedrock and alkali granite, ijolite and carbonatite. The alkali granite shows variable degrees of fenitization and brecciation. Alkali granite breccia has carbonatite veins/ matrix between the clasts. Three types of carbonatite are found on the property: calciocarbonatite, ferrocarbonatite and silicocarbonatite (AFRI 20000015102).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrochlore | Economic | Ore |
Sep 24, 2018 (Therese Pettigrew) - The property hosts niobium mineralization in pyrochlore. The Nb mineralization differs from that in the Prairie Lake Complex in that it is low in Th and U contents. Mapping conducted by Plato in 2017 led to the discovery of a 700 m long NE-trending alkali granite breccia with carbonatite matrix pointing towards Prairie Lake and the discovery of a 1.8 km long NW-trending ijolite characterized by a magnetic high anomaly. Samples collected by Plato in 2017 assayed between 112 and 764 ppm Mb and 0.11-5.25% P2O5 (AFRI 20000015102). In 2015, MDN Inc. collected samples from the same outcrop and pit area and returned assays of 258-740 ppm Nb. R. Wahl collected a sample that assayed 0.906% Nb2O5 and 9.89% P2O5 (AFRI 20000014693).
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