B-1 - Area 1, Coromandel Forest Park – Assessment of Environmental Effects 53 3.2.12.2 Ventilation Shafts All fencing and vent/egress surface infrastructure (vent stacks) will be removed at closure. Ventilations shafts located on paper road will be backfilled from underground via pumping a low strength cementitious grout. Shaft collars will be concrete sealed, covered with imported clean topsoil, and the area of shafts covered with manuka slash and allowed to revegetate naturally. This is the same method currently endorsed by DOC and employed by OGNZL to rehabilitate exploration drill sites. Such rehabilitation effectiveness will be monitored and managed for a period of 5 years following closure to ensure the success of such remediation.
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