# Halet Lake

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**Halet Lake** is the common name for a small lake in [Northern Ontario](/source/Northern_Ontario) used by the operators of [Coldstream copper mine](/source/Coldstream_copper_mine) to dump half a million tons of sulphide [tailings](/source/Tailings) in the mid 1960s.

## Description

Halet Lake is located east of Grassy Lake and northeast of [Burchell Lake](/source/Burchell_Lake).[1]

## History

Halet Lake became known as "Tailings Management Area 2" of the mine after the [Department of Lands and Forest](/source/Department_of_Lands_and_Forests) provided permission for the dumping.[1] The dumping occurred on the south west shore of the waterbody[2] between 1962 and 1967, forming a 3-hectare beach of tailings.[3]: 146 The tailings produced acid and contaminated downstream bodies of water, including [Wawiag River](/source/Wawiag_River) and Burchell Lake.[3]: 146

In 1998, the majority of the tailings were moved to below Halet Lake's water line, and 4,000 tons moved to the other tailings dump area of the Coldsteam copper mine site (Tailings Management Area 1). The move was undertaken to inhibit oxidisation and acid creation.[3]: 146

The water level dropped prior to 2008 exposing the tailings, but covered them after 2008 after a beaver dam raised the water level above the tailings. In 2012, [EWL Management Limited](/source/EWL_Management_Limited) built a structure to permanently raise the water levels above the tailings dump.[3]: 146

## See also

- [List of lakes of Ontario](/source/List_of_lakes_of_Ontario)

## References

1. Burns, R. Cecil; Orava, David A.; Zurowski, Michael; Mellow, Robert J. ["A Case Study of the Rehabilitation of Sulphide Tailings at the Coldstream Mine Tailings Management Area No. 2"](http://pdf.library.laurentian.ca/medb/conf/Sudbury99/AcidicDrainage/AD32.PDF). *[Laurentian University](/source/Laurentian_University)*. [Archived](https://web.archive.org/web/20220122143803/http://pdf.library.laurentian.ca/medb/conf/Sudbury99/AcidicDrainage/AD32.PDF) 2022-01-22 at the Wayback Machine.

1. ["Abandoned Mine Inventory Record 08489"](http://www.geologyontario.mndm.gov.on.ca/mndmfiles/amis/data/records/08489.html). *www.geologyontario.mndm.gov.on.ca*. Retrieved 2023-07-02.

1. *[58th Annual Meeting, Institute of Lake Superior Geology, Thunder Bay, Ontario, May16-20 2021, Part 2 - Field Trip Guidebook](https://studylib.net/doc/18625820/1.-sudbury-impactoclastic-debrisites-at-thunder-bay-2.-ge...) [Archived](https://web.archive.org/web/20220122151726/https://studylib.net/doc/18625820/1.-sudbury-impactoclastic-debrisites-at-thunder-bay-2.-ge...) 2022-01-22 at the Wayback Machine*, [Institute of Lake Superior Geology](/source/Institute_on_Lake_Superior_Geology)

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Adapted from the Wikipedia article [Halet Lake](https://en.wikipedia.org/wiki/Halet_Lake) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Halet_Lake?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.