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Bear Lake diggings (Gibson Road Western occurrence), Monmouth Township, Haliburton Co., Ontario, Canada

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Latitude & Longitude (WGS84): 44° 57' 48'' North , 78° 19' 6'' West
Latitude & Longitude (decimal): 44.96333,-78.31833
Other regions containing this locality:Bancroft area (Bancroft district), Ontario, Canada
Köppen climate type:Dfb : Warm-summer humid continental climate

The Bear Lake Diggings was, prior to 2016, the first publicly protected collecting site in the Province of Ontario. In 2016 it was sold and the new owner has closed the area to collectors.

The large amphibole and fluorapatite crystals are found in narrow "vein-dykes" emplaced in rocks of the Glamorgan complex, consisting mostly of gneiss amphibolite and marble. The vein-dykes are steep and sub-parallel and run approximately east-west. They are typically 1-2 m across.

The list of amphiboles for this locality is based on the microprobe analyses and normalizations provided by Hawthorne and Oberti (2006) and the guidelines provided in Hawthorne et al (2012) amphibole nomenclature report. Even though the analysed amphibole samples (euhedral crystals to 5 cm) was relatively homogenous it is possible that other amphiboles with richterite/katophorite root names are present at the locality. The amphiboles from here are normally labelled with a katophorite root name, and this is reflected in the uploaded photos of amphiboles from this locality. It is however quite likely that some of the photos show richterite root name amphiboles rather than katophorite root name amphiboles.

Mindat Articles

Searching for crystals in Calcite Trenches at Bear Lake Diggings, Ontario by Michael Adamowicz

Mineral List

19 valid minerals. 2 (TL) - type locality of valid minerals. 4 erroneous literature entries.

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

Neoproterozoic - Mesoproterozoic
541 - 1600 Ma

ID: 620666
Grenville Supergroup and Flinton Group

Age: Proterozoic (541 - 1600 Ma)

Stratigraphic Name: Flinton Group

Comments: Grenville Province Central Metasedimentary Belt

Lithology: Marble, calc-silicate rocks, skarn, tectonic breccias

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]

1200 - 1400 Ma

ID: 3185742
Mesoproterozoic sedimentary rocks

Age: Ectasian (1200 - 1400 Ma)

Lithology: Marble

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]

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

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Sabina, A.P. (1986) Rocks and Minerals for the Collector, Bancroft-Parry Sound Area and Southern Ontario. Geological Survey of Canada Miscellaneous Report 39.
Hawthorne, F.C., Oberti, R. (2006) Short-range order in amphiboles from the Bear Lake Diggings, Ontario. The Canadian Mineralogist, 44, 1171-1179.
Bermanec, V., Tomašić, N., Kniewald, G., Back, M.E., Zagler, G. (2008) Nioboaeschynite-(Y), a new member of the aeschynite group from the Bear Lake diggings, Haliburton County, Ontario, Canada. The Canadian Mineralogist 46, 395-402.

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