Resistivity Results GPH 492 Spring 2013 Schurz, NV

Field Map Box 1 Box 2 Box 3

Model Types Q-type: Decreasing apparent resistivity with depth H-type: Layer 2 apparent resistivity is less than layer 1 and layer 3 K-type: Layer 2 apparent resistivity is greater than layer 2 and layer 3 A-type: Increasing apparent resistivity with depth

Plot of Apparent Resistivity vs. A-Spacing

Box 2 Most profiles yield shallow high resistivity layer at the surface of less than 2 m Low resistivity layer at depth ranges from 4.5 to 40 m Range of imaginary component values is 0.01 to 0.33 ohms Depth of confidence of arrays: 20 meters

Box 3, all arrays parallel to fault trace -all arrays (except 8 and 10) showed a thin low resistivity layer at a shallow depth -Depth of the 1 st layer varied from ½ - 2 m, with one plot reaching 6.4 m, resistivity varied from 161 – 319 ohm-m. -All arrays were H or K-type models, 2 arrays could not be modeled with a RMS values less than The depth of confidence was between 1-3 m, this is probably too shallow to see a fault

Box 3 Imaginary Component error

Sources of error Metal spiked rod electrodes not completely grounded Electrodes not placed at exact A-spacing values Sand and Clay layers in Box 3 Open line in array; electrodes moved perpendicular from array

Conclusions We believe we found a low-resistivity anomaly at depth indicating possible location of fault in Box 1 Box 2 and 3 did not exhibit similar anomaly as in Box 1 May have missed the fault trace in Box 2