Yes, quarries are permitted on both Greenlands and in the Greenbelt if they meet certain criteria. In the case of Wellington County designated ‘Greenlands’, “it is essential that extraction be carried out with as little social and environmental cost as practical. Provincial standards, guidelines and regulations will be used to assist in minimizing impacts.” The County Official Plan has a list of criteria which must be taken into consideration.
In the case of the Greenbelt, aggregate extraction is also permitted, but again, there is a list of criteria which must be considered.
In both cases there are underlying assumptions that aggregate supply is urgent and that mitigation and rehabilitation can repair the damage done to the environment, for both of which they are compelling counter-arguments.