“This year’s top 10 nonleveraged ETFs by returns through July are focused on gold and silver, with all of them up at least 100% since the start of 2016, according to data from ETFdb.com, a site that provides information and analysis of the market. (Nonleveraged funds don’t use derivatives or borrowed money as part of their investment strategy.)”
http://www.wsj.com/articles/gold-and-silver-dominate-the-etf-charts-1470621723