Abstract

The copper content of waters and the copper and zinc content of sediments of streams draining the west slope of the Andes in central Chile were found to exhibit seasonal changes. Metal values were generally low during winter months because of reduced stream flow and temporary cessation of oxidation processes due to freezing conditions in the upper Cordillera. Sharp increases in metal content occurred in the spring due to increased flow and erosional power of the streams, and again in late summer as erosion products from metalliferous veins on protected slopes or at high elevations near the watershed divide reached the sampling points in the Central Valley.

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