McArthur Lake (FCEHV) is located in Timiskaming District,[1] about 40 kilometres (25 mi) south of the city of Timmins.

[8] McArthur Lake has a rocky shoreline with three main bays and thirteen islands.

[10] The lake lies in a zone of ultramafic metavolcanic rocks (Komatiites) known as the Tisdale Assemblage.

[3] The southwest corner crosses a northwesterly trending quartz-bearing diorite sill of intermediate intrusive rocks.

[13] 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 (12 sq mi), in 2007 via claim staking after an airborne geophysical survey showed magnetic continuity with the Texmont nickel-bearing lithologies to the south.