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in sinking or excavating a mine shaft, main haulage way or similar underground work designed for continuing use, for a mine in a mineral resource in Canada built or excavated after the mine came into production,
in sinking or excavating a mine shaft, main haulage way or similar underground work designed for continuing use, for a mine in a mineral resource in Canada built or excavated after the mine came into production,
in sinking or excavating a mine shaft, main haulage way or similar underground work designed for continuing use, for a mine in a mineral resource in Canada built or excavated after the mine came into production, or
in sinking or excavating a mine shaft, main haulage way or similar underground work designed for continuing use, for a mine in a mineral resource in Canada built or excavated after the mine came into production, or