Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31E12NW00015

Record: MDI31E12NW00015

General

Mineral Record Identification
Record Name(s)	Whitestone Pluton - 1986, Whitestone Anorthosite - 1969, Waubamik Anorthosite - 1967, Whitestone Diorite - 1980
Related Record Type	Simple
Record Status	Prospect
Date Created	1991-Apr-08
Date Last Modified	2022-Jan-05
Created By	Q Unknown
Revised By	A Wilson

Commodities

Primary Commodities: Feldspar (Nonmetals)

Location

Township or Area: Hagerman

Latitude: 45° 38' 4.93" Longitude: -79° 56' 13.64"

UTM Zone: 17 Easting: 582841 Northing: 5054011.004 UTM Datum: NAD83

Resident Geologist District: Sudbury

NTS Grid: 31E12NW

Point Location Description: approximate

Location Method: Conversion from MDI

Geology

Province: Grenville

Subprovince: Central Gneiss Belt

Terrane: Parry Sound

Domain: Parry Sound

Geological Age: Mesoproterozoic

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Anorthosite	1	Anorthosite To Gabbroic Anorthosite		Is
Gneiss-Unsubdivided	2			Contains

Lithology Comments

Dec 05, 2011 (A Wilson) - The undeformed rocks of the Whitestone Anorthosite may be subdivided into three primary facies based on texture and mineralogy: the oikocrystic facies, the porphyritic facies and the orthopyroxene-bearing facies. The oikocrystic facies is the most widely distributed. Rocks belonging to this facies contain large, spherical clinopyroxene crystals which subophitically enclose subhedral crystals of plagioclase. The oikocrysts range from less than l cm to almost 30 cm in diameter and are distributed in such a fashion that the rock assumes a "leopard spot" appearance. The porphyritic facies is mineralogically identical to, but texturally distinct from, the oikocrystic facies. Clinopyroxene occurs as subhedral crystals in the porphyritic facies and the subophitic texture characteristic of the oikocrystic facies is absent. In general, rocks of the porphyritic facies tend to contain a larger proportion of mafic minerals than rocks of the oikocrystic facies. The porphyritic facies is apparently randomly distributed within the oikocrystic facies. The orthopyroxene-bearing facies is restricted to the central portion of the Whitestone Anorthosite. In this facies, pale pink, distinctly pleochroic orthopyroxene coexists with clinopyroxene; in the porphyritic and oikocrystic facies, orthopyroxene does not occur.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Style
4	Magnetite	Economic	Ore	Disseminated
1	Plagioclase	Economic	Gangue
2	Clinopyroxene	Economic	Gangue
3	Orthopyroxene	Economic	Gangue

Mineralization Comments

Dec 05, 2011 (A Wilson) - An 8 hectare area in the vicinity of Blue Lake hosts a series of outcrops that contain <2% Fe2O3. Marmont estimates that is area may contain some 20,000 tonnes of anorthosite per vertical foot. Selected samples were analysed by the OGS for platinum, palladium, gold, chromium, vanadium and gallium, but all results were very low.

Mineral Record Details