In a stock market darkened by a troubled economy and accounting scandals, one investment still shines: gold shares. The S&P Gold Index, which includes North America's largest gold producers, has been the best sector performer this year, and the rally is not going to end any time soon, say money managers. Gold prices have been on a bull run this year amid concerns over financial irregularities in corporate America, a slumping US dollar, and tension in the Middle East. This has made gold miners one of the few safe havens in a troubled equity market.