Heavy Metal Hotspots at Formosa Superfund Site

My goal in this course is to create a sort of ‘analytical recipe’ for dealing with the extensive data set I’ve accumulated over the past couple years. I am interested in using the magnetic properties of sediments as proxy for mapping heavy metal concentrations. Magnetic measurements are fast, non-destructive and require little to no preparation. As such, they present a possible replacement for expensive and time consuming geochemical analyses. Less money and less time on monitoring means more money and more time for remediation. Magnetic measurements also yield information that is not acquired in general geochemical approaches such as dominant mineralogy.
The data I will be analyzing consists of measurements for the following properties: magnetic susceptibility (high field, low field and frequency dependence), anhysteric remnant magnetization, isothermal remnant magnetization, various derived ratios and heavy metal concentrations taken using a portable x-ray fluorescence gun. Samples have been taken semi-randomly from the abandoned mine which spans an area of approximately 75km2 and also from nearby streams; Middle Creek and Cow Creek. There is no temporal dimension to the data…yet.
Here are a couple of maps showing sampling points and location of the mine.

Here are a couple pictures of the site showing the encapsulation mound and surrounding area. What a lovely view from such a degraded place.

It will be necessary to correlate various magnetic properties with heavy metal concentrations for different grain sizes. The end product will be statistical relationships that describe the correlation of specific properties with the concentration of various metals. It is highly likely that not all metals of concern can be inferred from magnetic measurements. It will be interesting to see which metals, if any, can be mapped using magnetic approaches. The end map could show concentrations of specific metals mapped as weighted circles for each point that was sampled. For statistically significant correlations, maps could be produced to show how the magnetic measurements relate to concentrations as a side-by-side comparison. Other suggestions are welcome for this.
It is expected that specific metals will associate with various magnetic properties and that the concentration of metals will be highest in areas that are closer to drainage ways and extraction sites.

UPDATE
I have been successful in mapping some of the metals data in ARCMap, however Hot Spot Analysis has been giving me errors. There are obvious hot spots for nickel which is to be expected as nickel is prevalent in this area. The map for copper shows no significant hotspots. There are likely ecological and physical explanations for this lack of copper. It was one of the metals mined at this site.
The first image shows hotspots for nickel and the second one shows copper.