Abstract
Measurements have been made of rainfall, runoff and pollution levels in runoff, on a waste rock dump in which soluble salts are produced by pyritic oxidation. The dump is overburden material from the opencut mining of White's uranium orebody at Rum Jungle in the Northern Territory of Australia where there is a pronounced wet/dry season cycle. Most of the data were collected in the 1975-76 and 1976-77 wet seasons with some from the 1977-78 wet season. Events monitored in the first two wet seasons accounted for about half the rainfall in each. The runoff fraction, which averaged 15.6% over the two seasons, ranged up to a maximum of 33 %. Calculations of the runoff fraction using measured sorptivities and hydraulic conductivities predicted an even lower runoff fraction than that observed.
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