210 EVALUATING THE EFFECTIVENESS OF VOLUNTARY SUSTAINABILITY STANDARDS AT MIDSTREAM PINCH POINTS: INSTITUTIONAL AND INFORMATIONAL CONSTRAINTS IN GLOBAL MINERAL SUPPLY CHAINS *Chenhui Zhang1, Zezheng Lin2, Zhixin Cao2, Steven B. Young1* 1School of Environment, Enterprise and Development (SEED), Faculty of Environment, University of Waterloo, Canada (*Presenting author: Chenhui Zhang c835zhan@uwaterloo.ca) 2Harris School of Public Policy, University of Chicago, United States ABSTRACT Voluntary sustainability standards (VSS) have become increasingly important to supply chain governance in the mining, minerals, and metals (M3) sectors. A wide range of standards has emerged, differing in material scope and supply chain coverage, and developed by multistakeholder initiatives, industry associations, and non-governmental organizations. As participation by companies and production facilities expands, assessing whether these standards meet their intended purpose has become more pressing. Yet academic research has not reached a consensus on what constitutes effectiveness in the context of VSS, and empirical evidence of their measurable impact remains limited. This paper addresses these gaps through a structured review of the literature on VSS effectiveness, synthesizing existing conceptualizations and identifying their limitations. Building on this review, the study conceptualizes effectiveness in terms of three dimensions: uptake within the industry, demonstrated alignment with standard requirements, and measurable improvement in participant behavior or performance. Corresponding to these dimensions, the paper develops a structured approach to effectiveness measurement. The framework is illustrated through a case study of the Responsible Minerals Initiative (RMI), which has developed widely adopted standards operating at the midstream pinch point of the M3 supply chain. The analysis combines facility-level assessment data with firm-level ownership information to examine how structural concentration of facilities across specific metals and countries, cross-recognition, and ownership heterogeneity shape the institutional and informational landscapes of effectiveness evaluation. The findings demonstrate that, even where participation data are publicly available, institutional complexity and uneven informational visibility constrain the empirical feasibility of assessing behavioral and/or performance change.
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