Borehole Radar at an Underground Ventersdorp Reef site

Since long-range GPR probing from mine excavations can be problematic because of<br>significant clutter noise, recent experimentation has moved towards the application of GPR<br>from the relatively “clean” environment of boreholes. This technique, known as Borehole<br>Radar (BHR) was tested successfully for the first time in an underground deep level gold<br>mine in March of 1999. The Ventersdorp Contact Reef (VCR) is imaged with sub-metre<br>precision over ranges of up to ~ 45 m away from the borehole. Although still in its<br>developmental stage, BHR holds excellent promise as a high-resolution tactical tool for<br>providing geological information ahead of mining.