It remains in positive territory on a year-to-date basis, but the Global X Uranium ETF (URA) has also taken lumps in this choppy market environment.

iShares Silver Trust (SLV) -2.7%

Precious metals-related ETFs are taking a hit with the SLV, the Global X Gold Explorers ETF (GLDX), and the Global X Silver Miners ETF (SIL) heading south.

Like the Market Vectors Junior Gold Miners ETF (GDXJ), GLDX tracks a basket of smaller gold producers. The fund, however, is considerably more small cap-focused than GDXJ. This can be seen in comparing the two funds' Morningstar style box placement.

Ample exposure to small caps makes GLDX inherently vulnerable to market shakiness. For long term investors, this fund is best suited for a watch list rather than a portfolio.

All prices as of 2:11 PM DST

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