The World Heritage Committee,
- Having examined Document WHC/17/41.COM/7B,
- Recalling Decision 39 COM 7B.31, adopted at its 39th session (Bonn, 2015),
- Welcomes the trinational efforts undertaken by the States Parties of Canada, Mexico and the United States of America to preserve the Monarch butterfly migration, including establishment of the Trinational Working Group and encourages them to continue their efforts;
- Also welcomes the significant measures undertaken by the State Party to combat illegal logging and to restore the previously affected areas, but notes with concern that the property remains vulnerable to this threat and requests the State Party to strengthen its efforts in this regard;
- Notes with utmost concern that plans for reopening a copper mine in the vicinity of the property continue to be discussed, despite the conclusion of the National Commission for the Protection of Natural Areas (Comisión Nacional de Áreas Naturales Protegidas - CONANP) that the project would be incompatible with the conservation objectives of the Monarch Butterfly Biosphere Reserve, and also requests the State Party to ensure rigorously that any mining in the vicinity of the property will not be permitted if it has the potential to negatively impact the Outstanding Universal Value (OUV) of the property;
- Further requests the State Party to invite an IUCN Reactive Monitoring mission to the property to evaluate current and potential threats posed to its OUV by illegal logging and the proposed mining project, and to assess its overall state of conservation and the protection of the Monarch butterfly overwintering areas located both within the property and in its vicinity;
- Requests furthermore the State Party to submit to the World Heritage Centre, by 1 December 2018, an updated report on the state of conservation of the property and the implementation of the above, for examination by the World Heritage Committee at its 43rd session in 2019.