A series of cross-hole and single-hole electrical conductivity measurements were made within saturated Oracle granite. The tests, performed with point source and point reference electrodes (pole-pole or normal array), were designed to examine the equivalent homogeneous conductivity as a function of the rock volume by increasing the interelectrode separation. The length scale of the tests ranged from 8 inches to over 100 feet. Analysis of the data showed that (1) a power-law relationship was observed where the electrical conductivity increased (resistivity decreased) with electrode separation; (2) exponential variograms were derived for all distance classes; thus, no finite variance was attained; (3) conductivity can be approximated as a nonhomogeneous, locally isotropic variable; and (4) the log of the apparent resistivity for a particular scale of measurement (i.e., at constant current/potential electrode distances) can be fit to a fractional Brownian motion (fBm) process and thus interpreted as a fractal process. Overall, cross-hole and single-hole electrical resistivity measurements proved to be an efficient technique to assess the electrical behavior of the fractured rock mass at the Oracle site. ¿ American Geophysical Union 1995