Lafarge Montreal East quarry (Carrière Lafarge Montréal-Est; Francon Montréal-Est quarry), Montréal, Québec, Canada
Latitude: 45°37'14"N
Longitude: 73°32'6"W
This is a huge (1400 x 500 m)
limestone quarry currently worked by the Lafarge Group. It was opened in 1909 by Canada Cement within the city of Montreal in the old Montreal-East district.
The quarry was operated for some years by Francon Ltd., the same outfit that operated the famous Francon quarry, and is locally known as Francon Montréal-Est. This was the source of confusion for some collectors.
The limestone is intruded by an enormous igneous dyke up to 5 m thick which is exposed for a length of over 1 km in the quarry. There are also alkaline sills probably related to the Monteregian alkaline province (Mont St-Hilaire etc.). The minerals occur mostly in tiny cavities in the sills. This was the second known locality for weloganite.
The MRNF (Quebec Province's department of natural resources) provides the following description :
The stratas pending 3 degrees eastward belong to the Trenton Group (Tetreauville Formation). The compact, bluish-black limestone is in very regular beds up to 15cm thick, separated by clay interbeds.Mineral List
30 entries listed. 29 valid minerals.
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References
Tarassoff, P., Horváth, L. & Pfenninger-Horváth, E. (2006) Famous mineral localities: The Francon quarry, Montréal, Québec. Mineralogical Record 37, 5-60.
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