GeoExplorer Services
Why baseline data comes first
Environmental and social impact assessments increasingly require documented pre-mining groundwater conditions. Without a baseline, any future change in water quality or level has no reference point to be measured against.
A permit granted without baseline data leaves the operator unable to prove, later, that observed changes were not caused by the mine.
Monitoring network
Three boreholes were installed at increasing distance from the proposed pit:
Near-field borehole, 200 m from the pit boundary
Mid-field borehole, 800 m from the pit boundary
Far-field borehole, 2 km from the pit boundary, serving as a control point
Six-month results
Parameter | Near-field | Mid-field | Far-field |
|---|---|---|---|
pH | 7.1 | 7.4 | 7.6 |
Electrical conductivity (µS/cm) | 890 | 650 | 420 |
Nitrate (mg/L) | 3.2 | 1.8 | 0.9 |
Total dissolved solids (mg/L) | 610 | 440 | 290 |
The gradient observed between near-field and far-field values is consistent with existing land use rather than any mining-related influence, since no operations have started.
Recommendation
Continue quarterly monitoring through the permitting phase, and extend the network to a fourth borehole once the pit footprint is finalised. See our environmental services for the full scope of this kind of study.