Ontario Mineral Inventory

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Ontario Geological Survey
Permanent Link to this Record: MDI31E07SW00012

Record: MDI31E07SW00012

General

Mineral Record Identification
Record Name(s)	International Quartz Fletcher Lake Property - 1977, Fletcher Lake Quartz - 2000
Related Record Type	Simple
Related Record(s)
Record Status	Developed Prospect With Reported Reserves or Resources
Date Created	1991-Feb-11
Date Last Modified	2023-Mar-21
Created By
Revised By

Commodities

Primary Commodities: Quartz

Location

Township or Area: McClintock

Latitude: 45° 20' 55.78" Longitude: -78° 48' 37.27"

UTM Zone: 17 Easting: 671526.841 Northing: 5024034.073 UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31E07SW

Point Location Description: Precise. Based on satellite imagery of pit.

Location Method: Data Compilation

Access Description: The site can be accessed from County Road 12 which follows the south shore of Lower Fletcher Lake to a short access road leading to a small control dam at the southwest end of Fletcher Lake. From the dam road, the entrance trail/haul road to the quarry site is a left branch leading closely along the north shore of Fletcher Lake for approximately l km.

Exploration History

1990-2008: F. Jones – stripping, trenching, DD-5-131 m

Assessment Work on File

Assessment Work on File
Office File Number	Online Assessment File Identifier	Online Assessment File Directory
Tweed File McClintock # 52 / 2.20420	31E07SW2004	31E07SW2004
Tweed File McClintock #52 / 2.20849	31E07SW2007	31E07SW2007
Tweed File McClintock 59 / 2.26513	31E07NW2007	31E07NW2007
Tweed File McClintock #58 / 2.26663	31E07SW2009	31E07SW2009

Geology

Province: Grenville

Subprovince: Central Gneiss Belt

Terrane: Algonquin

Domain: McClintock

Geological Age: Mesoproterozoic

Lithology

Lithology Data
Rock Type	Rank	Composition	Relationship
Pegmatite	1		Host
Gneiss-Unsubdivided	2		Contains
Gabbro	3	Gabbro And Diorite	Contains

Lithology Comments

Feb 20, 2013 (A Wilson) - From the surface exposures, the deposit consists of a "zoned" pegmatite body with a core of nearly pure quartz. Surrounding the quartz are essentially parallel inner zones of potassic feldspar megacrysts. Further out from the quartz is an external zone of sodic feldspar pegmatite in contact with the wallrocks (biotite gniess). This quartz vein has a general trend of 095° and is 3-5 m wide at the east and west end and thickens to 10-15 m in width in the central portion. The vein appears to form an open fold (W- faulting) as the west portion strikes at 065° and dips 80° to 90° SE and the east portion strikes 110° and dips 65° SW. The vein is exposed over a length of 180 m and has been quarried in two pits in the central portion. The eastern pit is an elongate open cut that is approximately 50 m long, 7 to 10 m wide and 4 to 6 m deep (along the north face and west end). The west pit is separated from the east pit by a ridge of blasted pegmatitic boulders and outcrop and amphibolite outcrop. The west pit has dimensions of approximately 13 m x 25 m and is 3-5 m deep. The host rock to the vein is a medium-grained lineated, biotite amphibolite. Plagioclase-rich bands gradually alternate with thin fine-grained bands, lenses and xenoliths of mafic to ultramafic composition.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type
1	Quartz	Economic	Ore
2	Feldspar	Economic	Ore
3	Biotite	Economic	Ore
4	Epidote	Economic	Ore
5	Euxenite	Economic	Ore
6	Tremolite	Economic	Ore

Mineralization Comments

Feb 20, 2013 (A Wilson) - The central quartz is of exceptional purity, containing only minute traces of other minerals. Locally, some hematite staining is present on fracture surfaces – probably related to weathering effects or groundwater percolation. Occasional megacrysts of potassic feldspar are present in the quartz, especially near the quartz zone contacts. From this site, five samples resulted in an average normalized SiO2 value of 99.92% by means of XRF analysis. The normalized SiO2 range from 99.91% to 99.94%.

Mineral Record Details

Site Visit Information

Date: Jun 07, 2010

Geologist: P Sangster

Notes: site visited with MNR Aggregate Inspector - no apparent change to site since earler visit

Production Data
Year	Tonnes	Commodities	Reference	Comment
1977	7257			About 8000 tons of quartz had been marketed by 1977. The quarry was also active as an on demand site for local decorative and commercial purposes.