The Mt Isa Mine is located adjacent to Mt Isa in far northwest Queensland. Xstrata Copper proposed to expand a previously decommissioned open pit copper mine, known as the Black Rock Open Cut (BROC).
KCB was commissioned to undertake a groundwater and geochemical assessment of the BROC groundwater system during operation and post-closure of this pit.
Aspects of this work included:
- Review of available hydrological, hydrogeological, and geological data to develop a conceptual hydrogeological model.
- Geochemical description of the Black Rock Open Cut (BROC) waste rock based on available information.
- Completion of groundwater modelling to assess potential impacts to the regional groundwater system post-closure.
- Conceptual geochemical modelling for the BROC waste rock dump (WRD).
- A simplified geochemical model of the WRD.
- Discussion of geochemical and water quality risks from the WRD and qualitative mitigation measured using the established WRD as a comparison.
- Recommendation for monitoring measures to reduce uncertainty in predictions and future geochemical characterisation required for the BROC waste rock and WRD.