The formation of hydrothermal veins and associated metasomatic deposits is a process of long duration, during which alternating and recurrent phases of mineralization and fracturing take place. The quantity of ore relative to the dilute nature of hydrothermal solutions, the regularity of normal paragenetic suites, and the zonal distribution of ores, which indicates a gradual decrease in the temperature of the solutions, are considered evidence of the slow process. Zoned structures and other textural features testify to the multiple phases of the mineralization cycle. Reactivated faults permit renewed circulation of hydrothermal solutions, but are not necessarily the cause of mineralization.

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