Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001257

Record: MDI000000001257

General

Mineral Record Identification
Record Name(s)	OGS Sample H-403 - 1977, Grattan Township Occurrences - 1977, Lake Clear Occurrences - 2001
Related Record Type
Record Status	Occurrence
Date Created	2011-Jun-01
Date Last Modified	2022-Jan-05
Created By	A Wilson
Revised By	A Wilson

Commodities

Primary Commodities: Thorium, Uranium

Secondary Commodities: Rare Earth Elements

Location

Township or Area: Grattan

Latitude: 45° 28' 57.86" Longitude: -77° 4' 40.73"

UTM Zone: 18 Easting: 337605.004 Northing: 5038679.005 UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31F06NE

Point Location Description: approximate

Location Method: Data Compilation

Exploration History

1977: Ontario Geological Survey - sampling and analysis

Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Geological Age: Mesoproterozoic

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Granite	1	Granite		Host
Pyroxenite	2	Pyroxenite		Adjacent
Quartz Monzonite	3		Gneissic	Contains

Lithology Comments

Jun 10, 2011 (A Wilson) - The showing occurs in granitic pegmatite within gneissic, leucocratic quartz monzonite. Pyroxenitic dikes were mapped in the vicinity.

Mineralization

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

Mineralization Comments

Jun 10, 2011 (A Wilson) - Grab samples collected by Themistocleous returned: H-403A 0.21% U3O8, 5.82% K2O, and 1.9% Th; H-403B 0.75% U3O8, 1.45% K2O, and 11.4% Th, and H-403C 0.012% U3O8, 5.40% K2O, and 2.3% Th . The samples also returned: H-403A 110 ppm Ce, <100 ppm La, <100 ppm Nd, <0.1ppm Ta, <5 ppm Sc.

Mineral Record Details

Classification
Rank	Classification
1	Pegmatite

Characteristics
Rank	Characteristic
1	Disseminated