In which scenario should a deposit be reclassified?

A deposit should be reclassified when conditions affecting its classification change because various factors can impact how a deposit is categorized. These factors may include changes in the geological environment, such as the introduction of new materials, alterations in the surrounding ecosystem, or variations in the regulatory environment. Such changes could directly influence the deposit's characteristics, usability, or the methods required for its extraction or management.

In contrast, increasing the depth of a deposit might not necessarily change its classification; it could remain the same despite its depth. Similarly, while removing water from an area can change certain properties of the deposit, it doesn’t inherently modify its classification. Finally, the addition of layers could also change the characteristics, but not all additional layers warrant a reclassification; they could merely supplement the existing classification. Therefore, the most appropriate scenario for reclassification is when the conditions truly change in a way that affects how the deposit is understood or managed.