The PowerShares DB US Dollar Index Bullish (NYSE: UUP ) has had a powerful five-month winning streak that may be due for a breather. The combination of a rising U.S. dollar , falling interest rates and tepid inflationary statistics have not been kind to gold bullion prices or associated mining stocks. More recently, traders have been focused on plunging crude oil and natural gas prices , which has allowed gold the opportunity to make a stealthy move higher.