As one of the top three water-related production chemistry threats, mineral scale deposition can result in severe oilfield operational issues. Existing studies related to mineral scale deposition and control focus predominately on the thermodynamic aspect of scale deposition with little consideration of scale deposition kinetics. Coprecipitation of different types of mineral scales is a common phenomenon in both the natural environment and industrial applications. However, there are limited studies on coprecipitation kinetics of different scales, especially sulfate scales. In this study, coprecipitation kinetics of BaSO4/SrSO4 mineral scales in oilfield operational conditions was experimentally evaluated in a systematic manner. The impacts of barium to strontium molar ratio, scale saturation index, and electrolyte medium were investigated. It shows that the molar ratio and calcium electrolyte medium have the most significant impacts on sulfate scale deposition kinetics. This study can expand our capability in evaluating scale threats with complicated water produced compositions at operating conditions. The conclusions from this study can be profoundly insightful in developing an oilfield scale control strategy. The methodology elaborated in this study has the potential to be adopted as the standard procedure to evaluate scale threats when more than one type of scale are expected to deposit from the produced water.