The reconstruction of the fracture distribution behind or below the accessible surface of the rock<br>blocks in a quarry is fundamental to plan the mining activity and to improve the profit. Some 2D GPR<br>surveys were executed with 50 MHz unshielded antennas and with a 250 MHz shielded antenna to map<br>the layers and to define the depth of the limestone in the quarry in order to evaluate the total volume of<br>the limestone rock. The results of the GPR data were compared with the geological structures deduced<br>from the outcrops and from the exposed layers within the quarry. A quite good penetration was<br>observed: 70m at 50MHz and about 13m at 250MHz. 3D GPR surveys were also executed on some<br>areas where it was important to test the integrity of the rock by producing accurate 3D reconstructions<br>of the main fractures. The data were processed with a 3D dedicated software developed by the authors.<br>The results are very encouraging showing that the penetration and the potential of the radar technique<br>to detect fractures and thin layer interfaces in this limestone are very high.


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