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Purple Haze Amethyst Mine, Tartan Lake area, Thunder Bay District, Ontario, Canadai
Regional Level Types
Purple Haze Amethyst MineMine (Active)
Tartan Lake areaArea
Thunder Bay DistrictDistrict
Ontario- not defined -
CanadaCountry

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Latitude & Longitude (WGS84): 48° 37' 14'' North , 88° 58' 18'' West
Latitude & Longitude (decimal): 48.62083,-88.97167
GeoHash:G#: f08sx7huc
Locality type:Mine (Active) - last checked 2019
Deposit first discovered:1981
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Thunder Bay99,334 (2018)33.5km


Noted as the M.Grieve and Family Mine in Garland .

The amethyst deposit was staked by the Grieve family of Thunder Bay, Ontario, in 1981. The mining lease was obtained in 1986, and the property named the Purple Haze Amethyst Mine. The Grieve family continues to mine the deposit on a seasonal basis, producing fine collector specimens and landscape rock, as well as raw amethyst for the production of finished giftware and gemstones.

The claim group is located northeast of Thunder Bay within the Tartan Lake map sheet (G2706). This area is in the Superior geological province, probably within the dominantly metasedimentary Quetico subprovince near its southern boundary with the dominantly metavolcanic Wawa sub province.

Amethyst mineralization occurs in silicified, brecciated zones associated with east-west trending faults and contacts within granite. The granite is typically pink, medium-grained and equigranular. Associated with the amethyst mineralization are minor amounts of pyrite (visible as 1 mm euhedral crystals) and goethite (1-2 mm long acicular needles) trapped within the outer layer of amethyst crystals. Occasionally, chalcopyrite and pyrite are visible as isolated blebs within the matrix of the breccias.

Amethyst veins range in width from less than 1cm to in excess of 1.5m. Growth banding in the larger veins is very distinct, with terminations of earlier phases of crystal growth still visible. This amethyst vein material makes striking specimens in their own right, as well as attractive cutting material for lapidary arts.

Regions containing this locality

North America PlateTectonic Plate

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

'Feldspar Group'
Reference: Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119.
Hematite
Formula: Fe2O3
Reference: Cindy Hassler Collection
Quartz
Formula: SiO2
Reference: Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119. Collection of Cindy Hasler.
Quartz var: Amethyst
Formula: SiO2
Reference: Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119. Cindy Hassler Collection.
Quartz var: Chalcedony
Formula: SiO2
Reference: Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119.
Quartz var: Jasper
Reference: Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
var: Jasper4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Feldspar Group'-
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2
var: Jasper-SiO2

List of minerals for each chemical element

OOxygen
O QuartzSiO2
O HematiteFe2O3
O Quartz (var: Amethyst)SiO2
O Quartz (var: Chalcedony)SiO2
SiSilicon
Si QuartzSiO2
Si Quartz (var: Amethyst)SiO2
Si Quartz (var: Chalcedony)SiO2
FeIron
Fe HematiteFe2O3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoarchean
2500 - 2800 Ma



ID: 3186533
Archean sedimentary rocks

Age: Neoarchean (2500 - 2800 Ma)

Stratigraphic Name: Quetico Group

Lithology: Paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 614587
Massive granodiorite to granite

Age: Archean (2500 - 3200 Ma)

Comments: Superior Province

Lithology: Massive to foliated granodiorite to granite

Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. [1]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Garland, M.I. (1994) Amethyst in the Thunder Bay Area. Ontario Geological Survey, Open File Report 5891, 197 pages at p.119.


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