MacDonald Mine, Monteagle Township, Hastings Co., Ontario, Canada
|Latitude & Longitude (WGS84):||45° 9' 57'' North , 77° 49' 10'' West|
|Latitude & Longitude (decimal):||45.16611,-77.81972|
|Other regions containing this locality:||Bancroft area (Bancroft district), Ontario, Canada|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
A feldspar mine in a zoned granite pegmatite, located near Hybla.
Coordinates taken by GPS at mine.
Currently August 1st, 2012. The MacDonald Mine underground workings are being filled in so visiting the site at this time is FORBIDDEN, until further notice.
"This mine has been by far the largest operator in the entire Bancroft district, and was worked from 1919 till 1928, when work was suspended. It was opened up originally by the Pennsylvania Feldspar Company, which was taken over in 1920 by the Verona Mining Company, which in turn was taken over by the Genesee Feldspar Company of Rochester, in 1922. The last-named company has performed most of the work. The output, consisting of about 5,000 tons per year, has all been shipped to the Genesee Company's own mill at Rochester, N.Y.
The mine lies on the northeast slope of a hill and consists of a single main opening, started originally as an open-cut and worked by benching. A drift was later carried in on the dyke below the upper workings and the deposit worked by a series of irregular stopes with pillars left between them. The lastest work consisted of sinking near the mouth of the drift, but this operation encountered a large mass of calcite within the dyke mass, and caused the closing down of the mine.
The deposit is remarkable for the presence in it of a variety of rare-element minerals, some of them recorded here for the first time. Its content of such minerals makes this deposit one of the most remarkable pegmatites, mineralogically, yet discovered in Canada." (Thomson 1943)
Mindat ArticlesThe now closed MacDonald Mine, north of Bancroft by Michael Adamowicz
27 valid minerals.
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: Grenville Supergroup and 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.