Chemical variations in stream waters and sediments in the Moke Creek Area, West Otago

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Abstract
Stream water and sediment samples were collected at four-weekly intervals from the vicinity of a cupriferous lode-formation to study seasonal variation of copper content. Total copper content of the sediments and copper and sulphate content of the water tend to vary inversely to pH and creek discharge. Cold-extractable copper content of the sediments varies with total copper content for most but not all of the year. Copper content of the water and sediment tends to be high in the summer months, when temperature is high and creek discharge low, and then decreases until June. Following this, a winter maximum is reached, when discharge is low (the precipitation being retained as snow), lasting until September. Then follows a drop in copper content until the temperatuie rises in summer, and the discharge is again low. The intensity of the anomaly in the sediments produced by the lode-formation varies inversely with creek discharge.

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