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I believe those are caps for coil steel
Not sure if they're tall enough for that, unless the coils were loaded on their sides, risking damage.Alternative answer? Contaminated soil. Saw lots of gons similarly configured in the '90s responding to various cleanup programs.
Maybe copper...https://youtu.be/q5Ig0_4leioThomas
The Railwire is not your personal army.
Copper concentrate would be my guess, pretty common across Canada.