Nikova
... that historically, native mercury was extracted from rocks mined in Idrija by washing them in the stream Nikova?
... that historically, native <a href="./Mercury_(element)" id="mwAqI" rel="mw:WikiLink" title="Mercury (element)">mercury</a> was extracted from rocks mined in <a href="./Idrija" id="mwAqM" rel="mw:WikiLink" title="Idrija">Idrija</a> by washing them in the stream <b id="mwAqQ"><a href="./Nikova" id="mwAqU" rel="mw:WikiLink" title="Nikova">Nikova</a></b>?