As evidenced by the decline in commodity prices over the last three months, the US dollar is in bullish formation and has been appreciating in value considerably since the beginning of the year. A strong US dollar ultimately helps drive consumption in the US which in turn drives growth. As Americans witness lower prices at grocery stores and gas stations, they will consume more. This is great for consumption stocks and bearish for commodity-related stocks like gold miners (FCX, GDX, etc.).
