| James Lake | |
|---|---|
 Southwestern shore of James Lake viewed from Northland Pyrite Mine. | |
  James Lake | |
| Location | Temagami, Ontario |
| Coordinates | 47°10′43.71″N 79°44′14.60″W / 47.1788083°N 79.7373889°W |
| Type | natural freshwater lake with acidic water in part of it |
| Basin countries | Canada |
| Max. length | 2.25 kilometres (1.40 mi) |
| Max. width | 0.36 kilometres (0.22 mi) |
| Islands | various islands and islets |
James Lake is a lake in northeastern Ontario, Canada, located in the Temagami region along Highway 11.
Water levels of James Lake increased and decreased in the early 1900s.[1] The cause of this alternation could have been caused by beavers building dams in the lake's outlet, eventually causing the water levels in rise.[1] This rise in water levels began to cease in 1906 when operations of Northland Pyrite Mine on the lake's southwestern shore dumped waste rock into the lake.[1] Erosion of the waste rock resulted in the development of acidic lake waste waters next to the waste pile, causing neighboring organisms to disappear.[1]