|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 ArticlesSearching for crystals in Calcite Trenches at Bear Lake Diggings, Ontario by Michael Adamowicz
19 valid minerals. 2 (TL) - type locality of valid minerals. 4 erroneous literature entries.
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
|Neoproterozoic - Mesoproterozoic|
541 - 1600 Ma
|Grenville Supergroup and Flinton Group|
Age: Proterozoic (541 - 1600 Ma)
Stratigraphic Name: Flinton Group
Comments: Grenville Province Central Metasedimentary Belt
Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. 
1200 - 1400 Ma
|Mesoproterozoic sedimentary rocks|
Age: Ectasian (1200 - 1400 Ma)
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.