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by e2021 3539 days ago
Looks like a tailings dam to me, containing waste materials from the mine after processing. The solution has partially evaporated leaving a salt residue.

At least thats what it looks like to me. I don't think its a raised pyramid like the other reply says, pretty sure it is a hole.

If you do a google image search for 'tailings dam' you see some things that look pretty similar...