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- W2108803000 abstract "Groundwater modeling was used to assists in the design of a soil cover for an acidgenerating waste rock pile at the Woodcutters lead-zinc mine near Darwin, N.T., Australia. A three-dimensional groundwater flow (MODFLOW) and solute transport model (MT3D) was developed for the site to predict the timing and magnitude of peak zinc concentrations (the primary metal of concern) in shallow groundwater discharging to the nearest stream for different cover scenarios: (1) removal of the waste rock dump (no cover required); (2) use of a “high quality” cover (allowing net infiltration of 1% of MAP); (3) use of a “lower quality” cover (10% of MAP); and (4) use of a “low quality” cover (20% of MAP). The predicted times for a “breakthrough” of peak zinc concentrations in a nearby creek ranged from ~150 years for Scenario 1, to ~400 years for Scenario 4. While the lowest peak zinc concentrations were predicted for Scenarios 1 and 2 (~1.2 mg L -1 ), all scenarios produced peak zinc concentrations that exceeded the low risk trigger value (0.008 mg L 1 ) for protection of 95% of aquatic biota in the creek. An ecological risk assessment ensued which found that cover scenario 3 (10% of MAP) would be sufficient to protect the ecology in the nearby creek. In 2003/2004, the waste rock pile was reshaped and a high quality cover was placed. Detailed groundwater monitoring is ongoing at the site to assess the performance of all site closure measures, including cover placement. Monitoring over the last five years indicates that the groundwater flow system is recovering as predicted whereas contaminant concentrations (e.g. sulphate, zinc) in the local groundwater and the Woodcutters Creek are lower than predicted." @default.
- W2108803000 created "2016-06-24" @default.
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- W2108803000 date "2009-01-01" @default.
- W2108803000 modified "2023-09-27" @default.
- W2108803000 title "Groundwater Modeling as a Tool for Closure Planning: Prediction of Zinc Transport for Alternative Cover Scenarios 1" @default.
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