This week, the ratings of 3 Metals & Mining stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Carpenter Technology Corporation’s (CRS) rating worsens to a D from the company’s C rating a week ago. Carpenter Technology Corporation makes and distributes specialty metals and alloys. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CRS stock.

Mesabi Trust (MSB) earns a F this week, moving down from last week’s grade of D. Mesabi Trust operates as a grantor trust in the United States. The company also gets F’s in sales growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MSB stock.

Primero Mining Corp. (PPP) gets weaker ratings this week as last week’s C drops to a D. Primero Mining Corp. is focused on building precious metals assets in the Americas through acquiring, exploring, developing and operating mineral resource properties. The company also gets F’s in earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PPP 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.