the appropriate density for a hill made up of carbonates and voids was obtained through of the Bouguer anomaly and terrain correction with different density values (fig.4). the values were between 2.5 g/cm3 and 2.7 g/cm3, with steps of 0.05 g/cm3, reaching the maximum density assigned to carbonates.
the resulting maps show the most pronounced residual minima values to be located at the center of the hill, just slightly displaced to the NW of the highest topography. the residual minima produced by the presence of mine galleries are larger for the high density values (2.7 g/cm3) than foe the low ones (2.5 g/cm3). the minima shape is similar for all the maps, yet with varying extension.