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I've not been on the list for quite some time and my research has been in the US and Ireland, but the question of using the designation historic seems to cut across boundaries. I think that in defining a mine as "historic" you should consider factors such as relative age, i.e. if it is the first or one of the earliest (pioneer) mines in a mining region. Examples would be the Jackson Mine on the Marquette (MI USA)Iron Range or the Cliff Mine in the Michigan Copper Country. These are mines that helped spark and fuel the development of a mining regions. A second factor could/should be place in the industry -- was the mine noted for production, richness of ore, longevity, or innovations in mining technology or practice. An example that qualifies on all counts is the Cliffs Shaft Mine, also on the Marquette range in Michigan. Bill Mulligan