This article examines how operational-level grievance mechanisms (OGMs) implemented by transnational mining companies in Africa entrench corporate control over victims’ access to remedy. Although OGMs are central to the United Nations Guiding Principles on Business and Human Rights, their deployment in weak governance contexts often transforms them from early-warning tools into the sole avenue for redress. Through a comparative analysis of four different mines that reveal converging mining and business and human rights dynamics unique to Africa, this article considers how OGMs reproduce power asymmetries through opaque procedures, limited consultation, information imbalances, and unpredictable remedies. These dynamics undermine the UNGPs’ effectiveness criteria and reveal structural gaps within Pillar Three’s design. The article argues for alternatives, such as independent grievance mechanisms and additional guidance on implementing the UNGPs that guarantee legal representation, prohibit restrictive waivers, and introduce sector-specific recommendations. Without such changes, OGMs risk legitimising corporate abuses rather than remedying harm.