Open pit borate mine, SE California. mining, resources https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png 0 0 Marli Miller https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png Marli Miller2017-04-30 20:23:072017-09-25 19:58:52Open pit borate mine, SE California.
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