Bear Lake Diggings
Owner: Bancroft and District Chamber of Commerce
The Bear Lake Diggings site is located in the “Grenville” geological province, which is youngest portion of the Canadian Shield. It is on the south-eastern edge of the Glamorgan Gneiss Complex; and has also been referred to as the Maddill Road Occurrence. It is in Glamorgan Township and near the villages of Gooderham and Tory Hill.
The Bear Lake Diggings site is located in the “Grenville” geological province, which is youngest portion of the Canadian Shield. It is on the south-eastern edge of the Glamorgan Gneiss Complex; and has also been referred to as the Maddill Road Occurrence. It is in Glamorgan Township and near the villages of Gooderham and Tory Hill.
Consisting of rocks that range from 1 billion to 1.76 billion years in age, the Bear Lake Diggings area offers a diversity of mineral specimens that display excellent formation and frequently attain an enormous size. The two main groups of host rocks are Grenville-type metasediments (marble, paragneiss and amphibolite) and plutonic rocks (granite, syenite and gabbro).
Described by D.F. Hewitt in Ontario Department of Mines, Volume LXV, Part 6, 1956 pp 5-8, the geology of the area is all of Precambrian Age and: The metasediments, sandy and shaly limestone were laid down in the early Precambrian seas and have been highly metamorphosed, becoming impure marble, paragneiss and quartzite.
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