Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31D15SW00068

Record: MDI31D15SW00068

General

Mineral Record Identification
Record Name(s)	Northgate B - 1991
Related Record Type	Simple
Record Status	Occurrence
Date Created	1991-Feb-20
Date Last Modified	2022-Jan-05
Created By	Q Unknown
Revised By	Sheree Hinz

Commodities

Primary Commodities: Zinc

Location

Township or Area: Lutterworth

Latitude: 44° 48' 18.66" Longitude: -78° 46' 23.7"

UTM Zone: 17 Easting: 676095.96 Northing: 4963721.13 UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31D15SW

Point Location Description: Precise

Location Method: Conversion from MDI

Access Description: The occurrence is located just south of highway 35 between Moore Falls and Miner's Bay. The most direct route into the property is via a dirt road to the east of Moore Falls.

Exploration History

1954: Hans Lundberg flew an airborne radiation survey (620 miles flown). 1978: Jorex Limited flew an airborne radiometric survey. 1985: Francis T. Manns performed a geochemistry survey over the property. 1986-1988: Northgate Explorations Ltd. performed soil geochemistry, ground EM and magnetics surveys. 1990-1993: Alar Soever and associates performed prospecting, geological mapping, geochemistry and diamond drilling.

Assessment Work on File

Assessment Work on File
Office File Number	Online Assessment File Identifier	Online Assessment File Directory
W9490-00045	31D15SW0002	31D15SW0002
2.2865	31D15NW0003	31D15NW0003
63.556	31D15NW0004	31D15NW0004
63.5929	31C13SW0010	31C13SW0010
OP91-613	31D15SW0007	31D15SW0007

Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Geological Age: Mesoproterozoic

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Dolomite Marble	1			Host

Lithology Comments

Oct 30, 2019 (Sheree Hinz) - The zinc occurrences lie within the Denna Lake Structural Complex, a 2.5 to 6 km wide belt of predominantly marble and marble tectonic breccia that trends northerly immediately east of the Central Metasedimentary Belt Boundary Zone which separates the Composite Arc Belt from the Central Gneiss Belt. The marble tectonic breccias of the Denna Lake Structural Complex consist of rounded to sub-rounded clasts from tens of centimetres to hundreds of metres in size, of siliceous clastic metasedimentary rocks, amphibolites, calc-silicate rocks, layered marbles, and granitic rocks within a white to pink, calcitic marble matrix. Dolomitic and calcitic marbles also occur as layers, lenses, and large blocks within the area of marble breccia. A variety of siliceous, clastic metasedimentary rocks, including quartz arenites, wackes and rusty-weathering schists, are interlayered with the marbles. Dolomitic marble observed during the 2018 property examination is white, coarse-grained, and may contain dark green to brown serpentine, green diopside, white tremolite, and traces of graphite. Serpentine was observed primarily in marble structurally underlying and close to the zinc-bearing zone.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Sphalerite	Economic	Ore

Mineralization Comments

Oct 30, 2019 (Sheree Hinz) - A visually estimated 2-5% sphalerite in dolomitic marble was observed during a field visit. Grab sample by Alar Soever and Robert Jackson in 1991 returned an assay of 5.43% Zn. Soil geochemical results returned up to 1916ppm Zn and multiple values greater than 1000ppm Zn. During a 2018 property examination, marbles reacting to zinc zap were collected with both samples returned zinc assays of greater than 0.8% Zn.

Mineral Record Details