Bark Mounds, revisited

Disclaimer; all below are the initial analysis results, and are by no-means evidence of proof, without more in-depth science and multiple sources of data to back said results.
Great care is being taken to prevent any 'confirmation bias', and towards that end, all data is open for review, and inspection, by my peers.

After two days and nights at the bark-mounds, it is my position that more science needs to be undertaken, by as many sources as possible, to present a finalized conclusion.
Below are my two recorded events, and initial hypothetical impressions.

Initial two day and night visit, produced the initial analysis;

Short video, at a bark-mound site, at night. Minerals found were consistent with prior hypothesis, with initial belief being they are agricultural in nature; always subject to change.
Source: https://youtu.be/Fv_1KFWRguI
 


After hearing repetitive background grumbles, a test was designed, with the intent towards making a variation in the readings; if it was possible. Though only one test was conducted, a change did occur. This is not proof of hypothesis, only first test results. Is this repeatable, if not why, if so, is it consistent or only at specific times or solar azimuths?
 
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