McArthur Lake is a lake in Ontario, Canada to the south of the city of Timmins. The lake has a rocky shoreline and 13 islands. It is used for recreation in the summer, but freezes in the winter. Due to the harsh climate most of the trees around the lake are conifers. The rocks around the lake have potential for nickel extraction.
McArthur Lake (FCEHV) is located in Timiskaming District,[1] about 40 kilometres (25mi) south of the city of Timmins.[2] Most of the lake lies in McArthur township,[3] but the eastern part extends into Douglas Township.[4]
It has an elevation of 333 metres (1,093ft) above sea level.[5] It has an area of about 2,569,000 square metres (27,650,000sqft), with an average depth of 14 feet (4.3m) and a maximum depth of 50 feet (15m). It has a volume of 11,085,000 cubic metres (391,500,000cuft).
Islands in the lake include:
McArthur Island
Sharprock Island
Blueberry Island
Hidden Island
Delta Island
Shadfly Island
Olyjian Isle
Diorite Island
Midway Island
Crayfish Island
Cat Island
Maziic Island
Outset Island
Some of the bays in the lake include:
Leech Bay
East Bay
Theriault Bay
False Bay
Interior Bay
Climate
The lake is in the Hemiboreal climate zone.[6] Annual average temperature is 1°C (34°F). The warmest month is July, when the average temperature is 16°C (61°F), and the coldest is January, with an average temperature of −18°C (0°F).[7] Annual average rainfall is 904 millimetres (35.6in). The wettest month is August, with an average of 128 millimetres (5.0in) and the driest in February, with 11 millimetres (0.43in).[8]
Environment
Satellite view
McArthur Lake has a rocky shoreline with three main bays and thirteen islands.[2] The west side of the lake has more than 20 camps and cottages.[2] It is used for kayaking, boating and fishing for walleye and northern pike.[2] The lake is frozen over during the winter. In July surface water temperatures may reach 25°C (77°F). Trees include cedars and poplars, balsam firs and pines of various types, but few deciduous trees.[2]
Total phosphorus concentration was measured at two sites in the lake in 2004–2007. Average levels were:[9][10]
Date
West end, deep spot μg/L
Mid-lake μg/L
31 May 2004
6.69
6.52
16 May 2005
6.09
5.41
17 May 2007
7.28
6.63
Since these all levels are below 10μg/L the lake is considered oligotrophic and unlikely to experience nuisance algal blooms.[10]
In the south of the lake, gold is reported to be found, although exploration work has consisted almost entirely of trenching.[14] The lake is mostly contained within the McArthur Lake Nickel Property owned by Eloro Resources Ltd.. Eloro acquired this property, which covers about 30 square kilometres (12sqmi), in 2007 via claim staking after an airborne geophysical survey showed magnetic continuity with the Texmont nickel-bearing lithologies to the south.[4]
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