Coldstream copper mine

[3] The mine was managed by L. R. Redford who organized the construction of Burchell Lake township to accommodate the staff.

[2] The town, which accommodated 400 residents in its peak, also had four bunkhouses, a gas station, an ice rink, a general store, a pump house, and a two-room school.

[2] Goldshore Resources company undertook drilling at the mine site in 2022, finding copper, cobalt and gold at a depths around 63 metres.

[4] In 1977, International Mogul bought the mining rights from Nelson Machinery, which transferred to Conwest due to corporate mergers.

[4] Between 1992 and 1995, the Ontario Ministry of Energy, Northern Development and Mines ordered Nelson Machinery and Conwest to submit closure plans.

[1] After the valley was filled, the Ontario Department of Lands and Forest permitted the mine owners to deposit tailings into Halet Lake.

[4] Between 1998 and 2000, the 4,000 tons of tailings, representing a majority of what was on the beach, were submerged into Halet Lake in order to reduce oxidisation and associated pollution.

[4] Because some of the tailings were submerged by less than two meters, their protection from air oxidisation relies on water levels being high, which is reliant on the presence of a beaver dam.

[10] In 2015, the Environmental Commissioner of Ontario criticized the provincial government for the lack of financial assurances from the owner of the mine, EWL Management Limited, who were among a group of mine owners that had not put aside funds for environmental clean up fees, leaving the Government of Ontario at risk of covering any remediation costs.