Sentence:  In 1857, "Hutchings' California magazine" bragged that the Suite / Creek Foundry and another at Grass Valley, fifty miles north, were "the only works in the mining district where all kinds of machinery in brass and iron are cast for <WSD>quartzing</WSD>, and without the ..." 
Meaning of the word marked with <WSD> tags:  The extraction of quartz from the earth, and moreover the subsequent extraction of gold from quartz.