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

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

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.

Resistivity Range of common earth materials

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

Data and modeling - Tuesday

Data and modeling - tuesday

Data and modeling - tuesday

Interpretations

Interpretations continued

Data and modeling - friday

Data and modeling - friday

Data and modeling - friday

summary

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.

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