Gold ETFs are having a strong year that could get even stronger, two ETF analysts say. :
The group rallied Monday after it was revealed in SEC filings that billionaire investor Warren Buffett's company Berkshire Hathaway initiated a $562 million position in miner Barrick Gold in the second quarter. Exchange-traded funds that track physical gold, including the popular SPDR Gold Shares Trust (GLD), continued to climb Tuesday. The VanEck Vector Gold Miners (GDX) and Junior Gold Miners (GDXJ) ETFs reversed course, each falling less than 1%. Year to date, however, the miners have outperformed.