Using cokriging to predict metal recovery accounting for non-additivity and preferential sampling designs

•Mineral resource modelling should account for geometallurgical variables.•Current geometallurgical studies often ignore spatial relationships between data.•Geometallurgical properties can be cokriged considering linearly related mean values.•Cokriging variants are compared to predict copper recovery in an IOCG deposit.•Proposed variant avoids biases caused by heterotopic and preferential sampling designs.