To date, the scholarly literature has insufficiently investigated the micropolitical ecology of trust, the ways that different interests and expectations within a community can differentially mediate trust relationships between members of that community and an exogenous institution. This study explores the complexities of, and intra-community disagreements about, Kanak villagers’ decisions about whether to trust information provided by, or seemingly in support of, a multinational mining project in southern New Caledonia (South Pacific). An indigenous protest group challenged the company’s claims that the construction and operation of a refinery would have no harmful effects on local ecosystems. The company construed this opposition as stemming from fear based in ignorance, to which the solution lay in the provision of technical information. However, villagers disagreed as to whether this information was reliable. Meanwhile, many project employees joined the protest group. I argue that this seeming irony may be explained by examining the role of affiliation – defined here as a sense of solidarity with a group, and the desire to maintain that relationship – in establishing trust. Culturally-informed expectations of long-term social relationships and the reciprocal power these entailed, and concerns about long-term economic security, played a large role in determining which affiliations people chose to privilege, which in turn influenced which “scientific” information they chose to trust. Ultimately, I argue for the usefulness of a deeper understanding of relationships between trust, affiliation, and expectations of long-term social and economic relations in analyzing lay persons’ evaluations of science.