If you remember my ETF Talk from last week, I showcased a silver mining fund that was up 140 as part of a new theme that focuses on mining company exchange-traded funds (ETFs). Those mining funds have seen enormous share-price appreciation in recent months due to the boom in precious metals and related sectors.

While such impressive gains are hard to replicate, Im pleased to announce that I have found a gold mining ETF that also has seen triple-digit percentage gains so far this year. That exchange-traded fund is the Global X Gold Explorers ETF (GLDX).