Precious metals stocks over the past few days have been, well, precious. That's because many of them rose on the back of increases in the materials they mine and sell.

Hecla Mining (NYSE: HL), for one, notched a double-digit increase by rising almost 13% in price over the week, according to data compiled by S&P Global Market Intelligence. Ditto for Sibanye Stillwater (NYSE: SBSW), which advanced by 11%. Slightly behind but still posting a healthy gain was Ero Copper (NYSE: ERO) and its 8%-plus rise.

The performance and share price trajectory of any company in precious metals, of course, depends a great deal on the demand for those materials. Happily for Hecla, Sibanye Stillwater, Ero, and their many peers, they are having quite the run lately.

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Source Fool.com