This week, the overall grades of 3 Metals & Mining stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Southern Copper Corporation (SCCO) gets weaker ratings this week as last week’s C drops to a D. Southern Copper Corporation is an integrated copper producer. For more information, get Portfolio Grader’s complete analysis of SCCO stock.

Grupo SIMEC SAB de CV Unsponsored ADR Class B (SIM) declines this week from a C to a D. Grupo SIMEC SAB de CV Unsponsored ADR Class B manufactures, processes, and distributes special bar quality (SBQ) steel and structural products primarily in the United States, Mexico, and Canada. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of SIM stock.

Slipping from a D to a F rating, A. M. Castle & Co. (CAS) takes a hit this week. A. M. Castle & Co. provides a range of products and value-added processing and supply chain services to customers that are primarily in the producer/durable equipment sector of the global economy. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CAS 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.