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

Silver Standard Resources (NASDAQ:SSRI) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Silver Standard Resources is a silver exploration company focused on acquiring and developing silver resources on a global basis. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Revisions, and Margin Growth, SSRI also gets an F. The stock’s trailing PE Ratio is 33.90. To get an in-depth look at SSRI, get Portfolio Grader’s complete analysis of SSRI stock.

Teck Resources (NYSE:TCK) ratings are on the decline this week as the company earns a F (“strong sell”). Last week, it received a D (“sell”). Teck Cominco explores for and develops natural resources, witha focus on copper, metallurgical coal, zinc, gold and energy. In Earnings Growth, Earnings Momentum, Earnings Revisions, and Sales Growth the stock gets F’s. For a full analysis of TCK stock, visit Portfolio Grader.

Commercial Metals (NYSE:CMC) is having a tough week. The company’s rating falls from a C to a D rating. Commercial Metals recycles, manufactures, and markets steel and metal products and other related materials. The stock receives F’s in Earnings Momentum, Earnings Revisions, Earnings Surprise, and Sales Growth. For more information, get Portfolio Grader’s complete analysis of CMC stock.

Haynes International‘s (NASDAQ:HAYN) rating weakens this week, dropping to a F versus last week’s D. Haynes International develops, manufactures, and markets high performance alloys, primarily for use in the aerospace and chemical processing industries. The stock price has dropped 6.6% over the past month, worse than the 0.8% decrease the Nasdaq has seen over the same period of time. To get an in-depth look at HAYN, get Portfolio Grader’s complete analysis of HAYN stock.

This week, Mesabi Trust‘s (NYSE:MSB) rating worsens to a D from the company’s C rating a week ago. Mesabi Trust operates as a grantor trust in the United States. Investors seem to agree with the downgrade and have pushed down the share price 23.4% over the past month. For a full analysis of MSB stock, visit Portfolio Grader.

This is a rough week for Alderon Iron Ore Corp (AMEX:AXX). The company’s rating falls to F from the previous week’s D. Alderon Iron Ore is engaged in the acquisition, exploration and development of mineral properties. The stock gets F’s in Equity and Cash Flow. For more information, get Portfolio Grader’s complete analysis of AXX stock.

This week, Aluminum Corp. of China (NYSE:ACH) drops from a D to a F rating. Aluminum Corporation of China is a producer of aluminium, with operations in bauxite mining, alumina refining, primary aluminium smelting, and aluminium fabrication. It also provides ancillary products and services. To get an in-depth look at ACH, get Portfolio Grader’s complete analysis of ACH 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.