The term 'social licence to operate' (SLO) is relatively new to public discourse in Aotearoa New Zealand. It is increasingly being used in the aquaculture, dairy and mining industries due to their rapid intensification and consequent impact on natural resources. For Indigenous New Zealanders, Māori, there has been contestation about land and water usage since the signing of the Treaty of Waitangi in 1840. Māori have struggled to have their voices recognised. However, since 1975, the country has been developing a process that recognises Māori rights. For Māori, the Treaty of Waitangi is the prime 'social licence'. In this paper, we contextualise the notion of SLO in light of the Treaty of Waitangi, specifically in the case of mineral extraction. We examine the extent to which Māori values, as expressed through Māori resource management plans, cultural impact assessments and submissions on legislation, articulate the Māori SLO and what, in turn, this offers the wider field of impact assessment.