The purpose of this surface resistivity survey was to delineate the development direction of a gold ore deposit. The surface resistivity survey uses a 10m interval cable, which enables the FlashRES system to detect an explorable depth of up to 120m. The system found a low resistive band from 0-35...
Surface borehole survey2020-04-13
These two surveys were designed to maximise the value of two existing boreholes. There was already known mineralisation existing between 60-80m in Figure 1 and 100-115m in Figure 2. The inversion resistivity images showed not only the shape of ore bodies, but also other possible high mineralisati...
Crosshole surveys are used when two or more boreholes are present in order to provide the maximum imaging accuracy for the cross-section between respective boreholes.
Surface-point resistivity surveys are used to obtain detailed survey information around a known anomaly. At least one borehole is required near the point of interest.
High efficient Mise a la Masse2020-04-13
The traditional Mise-a-la-masse method is very useful for finding the developing direction of the ore body. However, this method is very time and effort-consuming.
The challenge with all 3D resistivity surveys is the large number of data points required. The data points are required so that a high enough resolution can be retained, despite an additional dimension.
Time lapse survey2020-04-13
Changes in underground resistivity usually result from variations in groundwater conductivity and soil water content. The time lapse resistivity survey method observes these variations and can help operators monitor abnormal underground or structural behaviour.
This borehole-surface resistivity/IP survey took place in Victoria, Australia. A mise-a-la-masse style survey configuration was used, eight surveys were taken with one cable in the borehole and the other cable on the surface pointing toward different directions. The figure bellow only shows the r...