[4] On 19 March 2003, the Mount Edziza Recreation Area was disestablished to allow resource development on the Spectrum mineral claims.

[6] From 1971 to 1973, Imperial Oil conducted geophysical, geological and geochemical surveying, as well as 463 metres (1,519 feet) of drilling in four holes.

[3] Consolidated Silver Ridge Mines also built an airstrip and carried out 3,232 metres (10,604 feet) of drilling in 28 holes during this time period.

Additional work on the Spectrum property by Newhawk Mines during this time period included the construction of an access road and 313 metres (1,027 feet) of underground development on the Hawk vein.

Mineral exploration conducted by Columbia Gold Mines from 1990 to 1992 consisted of rock sampling, trenching and 7,066 metres (23,182 feet) of drilling in 50 holes.