[2] In 1956, Canadian Thorium Corporation Limited purchased the site and completed ground geophysics and mapping.

[2] Kerr Addison Mines Limited and Quebec Mattagami Minerals continued to develop the site in 1965 to 1967.

[4] The Agnew Lake mine site was decommissioned, buildings removed, and the shaft capped.

Monitoring of the site was carried out by Kerr Addison between 1983 and 1988, with the property being turned over to the Ontario government in the early 1990s.

[2] The uranium mineralization at Agnew Lake is contained within a pyritic quartz-pebble conglomerate that unconformably overlies granitic rocks.