Ontario Geological Survey
Permanent Link to this Record:
MDI000000003251
| Record Name(s) | Black Mountain South - 2018, Trapper Lake - 2018 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2022-Nov-23 |
| Date Last Modified | 2023-Jan-24 |
| Created By | |
| Revised By |
Primary Commodities: Graphite
Township or Area: Miller
Latitude: 45° 5' 29.99" Longitude: -77° 4' 41.18"
UTM Zone: 18 Easting: 336475 Northing: 4995234 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F03SE
Point Location Description: Precise, sample BM-18-2 location from OFR6356 p. 51
Location Method: Data Compilation
Access Description: Access to the southern part of the property is via Highway 41 to Vennachar Junction; east on the Vennachar Road; northeast on Matawatchan Road; and south on Quackenbush Road to the hydro transmission line at the southern end of Trapper Lake.
2016: J. Martin and J. Andreana staked the property. 2017: J. Martin and J. Andreana carried out prospecting, sampling, and ground magnetic and resistivity surveys. 2018: J. Martin carried out prospecting and beep mat and VLF-EM surveys.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 35554 | 20000018712 | 20000018712 |
| 46570 | 20000017976 | 20000017976 |
Province: Grenville
Terrane: Bancroft
Domain: Black Donald
Nov 23, 2022 (Mateo Dorado-Troughton) - The following geological description is summarized from Duguet, Duparc and Mayer (2015), unless otherwise noted. The Black Mountain graphite prospect is located in the Centennial Lake area of the Black Donald domain in the northeastern part of the Central Metasedimentary Belt of the Grenville Province. The geology of the area is shown on a compilation map of the Denbigh area (Lumbers and Vertolli 2001) and on more recent field-based maps of the Black Donald Lake area (Duguet, Ma and Whitney 2017) and the Centennial Lake area (Duguet, Duparc and Mayer 2018). The geology of the Centennial Lake area is subdivided into 3 lithostructural units: the Western, Central, and Eastern units. The Black Mountain property lies within the Eastern unit, which is represented by a major, northeasterly trending synform centred on Centennial Lake. The lithological succession, from bottom to top, consists of migmatitic metapelitic rocks, amphibolites, calc-silicate schists and gneisses, and calcitic and dolomitic marbles. Dolomitic marbles in the Centennial Lake area are clean, white to grey, coarse grained and massive. They are in stratigraphic contact with siliciclastic units that include rusty schists that host graphite-pyrrhotite mineralization (Duguet, Duparc and Mayer 2018: unit 9g). In the Black Donald Lake area, Duguet, Whitney and Ma (2014) identified 2 continuous bands of siliciclastic rocks consisting of stromatic metatexite, calc-silicate rocks, and rusty schists containing pyrrhotite, pyrite and graphite. The bands are interpreted to belong to the same unit, repeated by folding. One band is exposed on the north shore of Black Donald Lake and the other, located along the south side of the lake, hosts the Black Donald graphite mine. The pyrrhotite-graphite–bearing units show up as coincident magnetic high and conductivity anomalies on airborne surveys conducted by Standard Graphite Corporation in the Black Donald Lake area (Desaulniers 2013). On the Renfrew aeromagnetic survey (Ontario Geological Survey 2014), the magnetic highs delineate the Centennial Lake synform and can be followed for over 30 km to the northeast. Duguet, Duparc and Mayer (2015) report 5 new graphite occurrences associated with sulphide-rich schists and gneisses in the Centennial Lake map area, all located on the edges of regional magnetic anomalies.
| Rock Type | Rank | Composition | Texture | Relationship | Diatexite Migmatite | 1 |
|---|---|---|---|---|
| Amphibolite | 2 | |||
| Schist-Unsubdivided | 3 | calc-silicate | Host | |
| Gneiss-Unsubdivided | 4 | |||
| Calcite Marble | 5 | |||
| Dolomite Marble | 6 |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrrhotite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Graphite | Economic | Ore |
Nov 29, 2022 (Therese Pettigrew) - A cross section from east to west across one of the graphitic zones at the southern end of the property is as follows (Graphite percentages are visual estimates only): Footwall - banded quartz-biotite and quartz-feldspar-biotite gneiss, minor garnet and trace pyrite; Graphite Zone - quartz-feldspar-biotite-phlogopite schists containing 1-3% fine- to medium-grained flake graphite, moderate to strong gossan on weathered surface, including one 0.3 m wide band containing 10% graphite and minor disseminated pyrite; Hangingwall - quartz-feldspar-biotite gneiss, weathers grey, no visible sulphides or graphite. Coarse-grained, white, calcitic marble was observed to the west of the felsic gneiss unit in the vicinity of Trapper Lake. The marble contains minor tremolite, phlogopite, and a grace of graphite. Sample BM-18-2 returned 3.29% graphite (Assessment report 20000017976).
Mono - Report of Activities 2018, Resident Geologist Program, Southern Ontario Regional Resident Geologist Report: Southeastern and Southwestern Ontario Districts and Petroleum Operations
Publication Number: OFR6356 Page: 48-58 Date: 2019
Author: Tessier A.C., LeBaron P.S., Smith A.C., Laidlaw D.A., Bousquet P., Fortner L.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Southern Ontario Resident Geologist District Office