New Gold's (NGD +0.27%) stock was hardly golden on the market this week. As one of the many pure-play precious metals mining companies on the scene, its equity took a hit as the prices of such goods declined over the past few days. Ultimately, its shares fell by 17% over the week, according to data compiled by S&P Global Market Intelligence. A pure-play at heartPrecious metals had been on a tear for months, culminating in an all-time high spot price for gold of almost $5,600 per ounce in late January. That ...