Between 1953 and 1956, one hundred area prospects were opened, including one by Paul Mulliette of Toronto who discovered uranium in 1953, which was developed into Dyno Mine.

[1][2] In 1956, brush was cleared to create 200 houses in Cardiff, some for executives of nearby Bicroft Mine and a settlement called Dyno Estates was built near Ontario Highway 28 for executives of Dyno Mine.

Other construction quickly followed, including, two single-men's bunkhouses, a canteen, an eleven-room school, an ice-curling rink, and a recreation center.

[4] The mine produced to 363,758 kg of U308[4] before closing in 1960 when ore supplies were depleted.

Ovintiv absorbed EWL Management Limited on February 22, 2022 and assumed responsibilities for the mine, but not updated any of the licensing documentation to reflect the change.