Updated from 1:36 p.m. EDT

Ruth's Chris Steak House ( RUTH) fell earlier in the day but closed up 0.5% after the restaurant operator warned that second-quarter revenue would fall below Wall Street's forecast. The company sees revenue of $76.9 million to $77.1 million. Analysts project revenue of $78.1 million.

"While our diverse consumer base contributes to our significantly higher per restaurant sales volumes, it also exposes us, to some extent, to the macroeconomic issues facing our industry," the company said. "Although restaurant sales were somewhat below our expectations, we expect cost controls and efficiencies to preserve restaurant-level profitability." Shares closed up 8 cents to $17.35.

Shares of Newmont Mining ( NEM) rose 5.6% after the gold producer removed its entire 1.85 million ounce gold hedge.

"With the elimination of our gold hedge book, we have renewed our commitment to maximizing gold price leverage for our shareholders," the company said. During June, the company spent $578 million to eliminate its gold hedge. As a result, Newmont will report a pretax loss of about $531 million.

The company also plans to monetize parts of its royalty and equity portfolio during the next 12 months. As a result, its merchant banking segment will no longer operate as a separate business unit. Shares closed up $2.20 to $41.78.

PriceSmart ( PSMT) rose 4.4% after the retailer posted a big gain in June same-store sales. For the four weeks ended July 1, the company posted an increase of 23.2%. Total sales, meanwhile, increased 25.2% to $73.4 million. Shares closed up $1.12 to $26.48.

Material Sciences ( MSC) fell 4.1% after the maker of steel products swung to a first-quarter loss. The company reported a loss of $275,000, or 2 cents a share, on revenue of $60.7 million. During the year-earlier quarter, the company earned $2.3 million, or 15 cents a share, on revenue of $75.8 million.

"Production cuts at the three largest North American automobile manufacturers stretched into calendar year 2007 and hurt Materials Sciences' first-quarter sales, as did weakness in the residential and commercial construction markets," the company said. Shares closed down 53 cents to $12.30.