This week, the ratings of 4 Metals & Mining stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Compass Minerals International, Inc. (CMP) declines this week from a C to a D. Compass Minerals International, Inc. produces highway deicing salt in North America and the United Kingdom. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of CMP stock.

Handy & Harman Ltd.’s (HNH) rating weakens this week, dropping to a D versus last week’s C. Handy & Harman Ltd. produces steel products, roofing supplies, and metal joining products. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of HNH stock.

Ampco-Pittsburgh Corporation (AP) gets weaker ratings this week as last week’s C drops to a D. Ampco-Pittsburgh Corporation is engaged in manufacturing and selling custom-engineered equipment in a global marketplace. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of AP stock.

Nevsun Resources Ltd. (NSU) experiences a ratings drop this week, going from last week’s C to a D. Nevsun Resources Ltd. is a gold producer and base metal developer. The company also gets F’s in sales growth and operating margin growth. For more information, get Portfolio Grader’s complete analysis of NSU 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.