Bentley Lake occurrence (Madawaska mine property), Faraday Township, Hastings Co., Ontario, Canada
|Latitude & Longitude (WGS84):||45° 1' 39'' North , 77° 55' 5'' West|
|Latitude & Longitude (decimal):||45.02750,-77.91806|
|Other regions containing this locality:||Bancroft area (Bancroft district), Ontario, Canada|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
|Other/historical region names associated with this locality:||Bentley Lake occurrence (Faraday mine property)|
The occurrence was originally staked as a uranium prospect by A.H.Shore of Bancroft in 1949.
Access Description: Hwy 28 to Siddon Lake road, park past the end of the road (past lot 101) and walk N 250 m to a trench on the S slope of a steep hill. A large face of calcite contains ilmenite crystals. Magnetite # 1 : 60 ft N-NW of cottage road as it traverses 'pt 98' of lots 14-15, con A. A trench, 30 x 2-5 ft deep and 3-4 ft wide is on the N. Pappas property - no collectors allowed. Magnetite # 2 : On the S-facing slope, immediately below a bluff, about 100 ft into lot 15 (W) from Pappas' W boundary. A trench, 100 x 3-5 ft wide and 1-6 ft deep. Property owned by E. Stanfeld, mining rights by Madawaska Mines. Magnetite # 3 : About 400 ft NW of # 2, on the top of a ridge. Spotty diggings extend 300 ft W, 3-5 ft wide and 2-10 ft deep - magnetite with sphene. Ilmenite : lot 15, con A, about 400 ft W of # 2 and 150 ft SW of # 3. Calcite face with vug, about 35 x 8 ft high, 10 ft W of a skid road on it's E side and 200 ft E of a skid road on it's W side.
This is the locality for the large ilmenite and magnetite crystals mentioned in the Ontario issue of the Mineralogical Record (1982).
Such specimens are often labeled as being from the mine (Faraday or Madawaska), but they were actually found at a surface showing on the property, also known as the Bentley Lake Occurrence.
Robinson & Chamberlain (1982) report under Ilmenite that "Fine crystals of ilmenite weighing more than 30 kg have been found associated with magnetite, biotite, microcline and apatite in a small calcite vein-dike on the Madawaska mines property near Bancroft."
And later, under Magnetite: "The second [magnetite] occurrence is at the ilmenite locality on the Madawaska mines property, where hundreds of fine crystals have been removed."
8 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
|Mafic to ultramafic plutonic rocks|
Age: Proterozoic (541 - 1600 Ma)
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. 
1400 - 1600 Ma
|Mesoproterozoic crystalline metamorphic rocks|
Age: Calymmian (1400 - 1600 Ma)
Lithology: Crystalline metamorphic rocks
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.