In the Silver Valley, though ... but froth flotation is quite common in metal refining; we’ve seen it used to concentrate everything from lightweight graphite to ultradense uranium.

Silver ore and scrap silver have to go through a refining process in order for the pure silver to be separated from the dross. Cupellation is when it is heated to 1,200 degrees Celsius in a ...

HF Sinclair's first-quarter earnings exceeded market expectations, even as it reported a loss due to weak refining and renewables performance. Midstream, marketing, and lubricants all performed well.

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