Ontario Geological Survey
Permanent Link to this Record:
MDI31F01SW00033
| Record Name(s) | H. Pharoah - 1985 |
|---|---|
| Related Record Type | Simple |
| Record Status | Occurrence |
| Date Created | 1985-May-30 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Q Unknown |
| Revised By | Sheree Hinz |
Primary Commodities: Zinc
Secondary Commodities: Lead, Silver
Township or Area: Lanark
Latitude: 45° 7' 9.9" Longitude: -76° 28' 13.43"
UTM Zone: 18 Easting: 384351.29 Northing: 4997267.82 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F01SW
Point Location Description: Precise, square symbol Zn 10 E of Brightside on Hwy 1, W 1/2 lot 25 conc 4.
Location Method: Conversion from MDI
Access Description: The occurrence is located approximately 1.6 km east of Hwy 511 at Brightside, on the farm of Norval Wilson. The property is accessible via a gravel road past Andersons Rapids and a farm road.
1975: H. Pharoah discovered property. 1975-1977: Selco Mining Corp. Ltd. optioned the property and completed geological mapping, soil and stream sediment sampling, geochemical survey, 19 diamond drill holes totaling 1187m.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Terrane: Bancroft
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Calcite Marble | 1 | Well-Layered | Host |
|---|---|---|---|---|
| Dolomite Marble | 2 | Massive | Host | |
| Granite | 3 | Conformable | Near | |
| Diorite | 4 | Dioritic | Conformable | Near |
Oct 30, 2019 (Sheree Hinz) - The property is underlain by 3 principal rock types: massive hornblende diorite, medium to coarse-grained, banded light to medium grey, interbedded calcitic and dolomitic marble, and massive, coarse-grained granite, occurring as narrow dikes. The marble strikes roughly NE and dips 45° to 60° degrees SE. Outcrops of diorite and granite are common to the north and west of the cleared fields, which are underlain predominantly by marble. The occurrence is a blind deposit and was located in bedrock by Selco following B-horizon soil sampling, till sampling, trenching, and diamond drilling. Diamond drill logs indicate that the contact between diorite and marble is less well-defined than shown on the geological map and consists of a series of diorite sills from 3 m to 15 m wide alternating with units of dolomitic marble of roughly the same range of widths. Minor widths of pink, granitic pegmatite (1 to 2 m) were also intersected.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Sphalerite | Economic | Ore |
Oct 30, 2019 (Sheree Hinz) - Zinc mineralization was not observed in bedrock during a property visit in 2018. However, angular blocks of pale grey, fine to medium-grained, dolomitic marble up to 0.5m in diameter and containing up to 10% sphalerite were observed in stone piles near the contact between marble and diorite outcrop areas. The sphalerite occurs as conformable, discontinuous bands and lenses up to 3 cm wide, with minor disseminated sphalerite and pyrite between the zinc-rich bands. A mineralized zone observed by Carter et al (1980) was 1 to 2 m wide and 15 m long. A second zone was reported to have been slightly larger. Both were tested by diamond drilling, which indicated that neither zone has continuity laterally or at depth. Of the 19 holes drill by Selco, 5 intersected zinc mineralization. Best assays are 1.1% Zn/3.65 m, including 5.08% Zn/0.3 m; 3.96% Zn/1.5 m; and 1.65% Zn/1.5 m. All are described as consisting of occasional bands and stringers of sphalerite with minor disseminated pyrite. Serpentine and calc-silicates were noted in the dolomitic units containing the mineralization. One of the mineralized boulders uncovered during a property visit in 2018 returned an assay of 7.1% Zinc.
| Rank | Classification |
|---|---|
| 1 | Syngenetic |
| Rank | Characteristic |
|---|---|
| 1 | Stratiform |
MonoMap - Geology of base metal, precious metal, iron, and molybdenum deposits in the Pembroke-Renfrew area
Publication Number: MDC020 Scale: Date: 1980
Author: Carter T.R., Colvine A.C., Meyn H.D.
Publisher Name: Ontario Geological Survey
Mono - Metallogeny of the Grenville Province, southeastern Ontario
Publication Number: OFR5515 Scale: Date: 1984
Author: Carter T.R.
Publisher Name: Ontario Geological Survey
Map - Geological series, base and precious metals, iron and molybdenum deposits of Pembroke-Renfrew area, southern Ontario
Publication Number: P2211 Scale: 1:126,720 Date: 1979
Author: Carter T.R., Storey C.C.
Publisher Name: Ontario Geological Survey
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