The grades of 3 Metals & Mining stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Nucor Corporation (NUE) is seeing ratings go up from a C last week to a B this week. Nucor Corporation products include carbon and alloy steel, steel joists, steel deck, cold finished steel, steel grinding balls, steel bearing products, and metal buildingsystems. The company also gets A’s in earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NUE stock.

Century Aluminum Company (CENX) boosts its rating from a C to a B this week. Century Aluminum Company produces primary aluminum, which is an internationally traded commodity. The company also gets A’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CENX stock.

This week, Pershing Gold Corporation (PGLC) pushes up from a C to a B rating. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of PGLC stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.