In March 2019, the Indigenous communities of Huini Coroccohuaycco and Pacopata of the Espinar Province filed a Constitutional writ (amparo) demanding that the Peruvian State initiate the process of free, prior and informed consent in accordance with international standards through the National Service of Environmental Certification for Sustainable Investments (SENACE) regarding the Glencore Antapaccay Tintaya Expansion. The community claims they are affected by the amendment to the mine's Environmental Impact Assessment (Modification of the Environmental Impact Study called "Glencore Antapaccay Tintaya Expansion – Coroccohuayco Integration") and denounce the lack of community participation. The case is supported by the Legal Defense Institute, Human Rights without Borders, and CooperAcción.

In April 2025, the Espinar court dismissed the lawsuit on the grounds that the claims were unfounded. In June 2025, the Indigenous communities of Huini Coroccohuaycco and Pacopata of the Espinar Province filed an appeal against the first instance ruling. In July 2025, the First Mixed Chamber - Sicuani Headquarters of the Superior Court of Justice of Cusco, held an appeal hearing. In August 2025, a second appeal hearing was held before the Superior Court of Justice of Cusco to obtain a deciding vote from an additional judge.

Cusco's Superior Court ruled against the communities, upholding the Glencore' argument that Peruvian law does not require prior consultation based on an Environmental Impact Assessment. Huini Coroccohuaycco and Pacopata communities have since filed an appeal before Peru's Supreme Court, which could take years to reach a decision.

In May 2026, SENACE approved the Second Modification of the Environmental Impact Assessment (MEIA) for the Antapaccay Coroccohuayco Integration project clearing the way for an estimated USD1.8 billion investment and open-pit extraction expected to begin in 2029.

The case is ongoing.