Market Vectors Gold Miners ( GDX ) is down 0.16% to $61.21. Stocks are solidly lower at mid-day as investors react to a disappointing outlook from Cisco Systems ( CSCO ), renewed concerns over sovereign debt in Europe, which is pushing the dollar higher, and warning signs out of China about inflation. Investors are also eying the Group of 20 Summit in South Korea where world leaders are trying to develop plans to bolster a generally weaker global economy amid allegations of currency manipulation and widening trade gaps.