TheStreet.com Ratings provides exclusive stock, ETF and mutual fund ratings and commentary based on award-winning, proprietary tools. Its "safety first" approach to investing aims to reduce risk while seeking solid outperformance on a total return basis.NEW YORK ( TheStreet) -- Investors' fears of another stock decline are stoking gold fever. The spot price of gold broke hit $997.80 an ounce on Thursday, the highest level since February. Gold has risen 4.6% in the past week. Silver added $1.81 to $16.12 for a one-week surge of 13%. For the week ending Thursday, the average precious metals fund we track popped 7.6%. The best-performing precious metals fund this week is the ProShares Ultra Silver ( AGQ), which tracks the U.S. price of silver in London with 200% leverage. This exchange traded fund skyrocketed 27%. The Precious Metals UltraSector ProFund ( PMPIX), a mutual fund, was the No. 2 fund with a 16% gain. The fund tracks the Dow Jones Precious Metals Index with 150% leverage. It benefited from large holdings of Barrick Gold ( ABX), Goldcorp ( GG), Freeport-McMoRan Copper & Gold ( FCX) and Newmont Mining ( NEM). If you prefer unleveraged funds, take a look at the Market Vectors Gold Miners ETF ( GDX), which tracks the Amex Gold Miners Index. The index's top performers of the past week included Vista Gold ( VGZ), up 31%; IAMGOLD ( IAG), up 22%; Golden Star Resources ( GSS), up 21%; and Northgate Minerals ( NXG) up 19%.