They then played a major exemplary role on the technical and social levels through to recent times. Criterion (iv): The ensemble of the four Walloon mining sites provides an eminent and complete example of the world of industrial mining in continental Europe, at various stages of the industrial revolution. AuthenticityThe authenticity of the individual components of the serial property varies somewhat depending on the component considered and depending on all the property’s sites, but it achieves a satisfactory level overall. Nonetheless, an overarching conservation plan would be welcomed to ensure the authenticity of this serial property is lastingly maintained. Starting from the addition of sites with separate management and conservation systems, the serial property has recently acquired a permanent overarching body that is operating effectively: the overarching Coordination Group.