1. Electro-Resistivity at Perry Canyon for the Burris Mine
Team 8: James Pitcher, Peter Porata, Gabriel Nunez
GPH 492
May 3rd, 2016

2. Theory of Operation
Using an Electro-resistivity meter, soundings of increasing a-spacings are made until a noticeable change occurs
The configuration chosen for the measurements was the Wenner array
Different resistivity measurements indicate where water quality is pure or whether there is an aqueous solution laden with ions/cations
Once establishment of the notable depth is made using soundings, many readings are made of the area at the salient depths to produce a contour map of the spatial boundaries of where our plume of interest lies

3. Motivation for performing resistivity soundings
Tracking of acid-bearing leachate plume.
Construct a 1-D contour map that conveys plume position.
Assess water quality.
Further our understanding of geophysical applications.

4. Resistivity Range of common earth materials

5. Methods for processing data
Burger & Sheehan “Resistivity” program for # of layers, thicknesses, and correlating resistivity
Excel plotting of resistivity with depth/a-spacing
Drawing contour maps distinguishing areas of high resistivity from low

6. Data and modeling - Tuesday

7. Data and modeling - tuesday

8. Data and modeling - tuesday

9. Interpretations

10. Interpretations continued

11. Data and modeling - friday

12. Data and modeling - friday

13. Data and modeling - friday

14. summary

15. Conclusions
Results confirm that a plume is present under the mine dump. Our data analysis indicates that there is a low resistivity material (ρ<1Ω⋅m) at an average depth of 5 and 8 meters.

16. Uncertainty
Aleatory uncertainty: physical variability present in the system being analysed or its environment.
Epistemic uncertainty: potential deficiency that is solely due to a lack of knowledge.
Table 1 - Uncertainties
Aleatoric
Epistemic
Surface noise
Depth / Boundary conditions
Anisotropy
Conductance of plume
Topography