For the current week, the overall ratings of four Metals and Mining stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Harmony Gold Mining‘s (NYSE:HMY) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). Harmony Gold Mining is a mining company which produces gold from its operations in the district of Virginia, Orange Free State. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Revisions, HMY also gets F’s. The stock price has fallen 11.3% over the past month, worse than the 2.5% decrease the S&P 500 has seen over the same period of time. For a full analysis of HMY stock, visit Portfolio Grader.

The rating of Eldorado Gold (NYSE:EGO) slips from a D to a F. Eldorado Gold acquires, explores, and develops mineral properties. The stock gets F’s in Earnings Momentum, Earnings Revisions, and Earnings Surprise. Investors seem to agree with the downgrade and have pushed down the share price 11% over the past month. The trailing PE Ratio for the stock is 26.40. For more information, get Portfolio Grader’s complete analysis of EGO stock.

This week, New Gold Inc. (AMEX:NGD) falls to a D (“sell”), worse than last week’s grade of C (“hold”). New Gold acquires, explores, and develops gold properties. The stock also gets an F in Earnings Growth. The stock’s trailing PE Ratio is 42.10. To get an in-depth look at NGD, get Portfolio Grader’s complete analysis of NGD stock.

Slipping from a C to a D rating, Stillwater Minin (NYSE:SWC) takes a hit this week. Stillwater Mining is engaged in the development, extraction, processing, refining and marketing of palladium, platinum and associated metals from a geological formation in south central Montana known as the J-M Reef and from the recycling of spent catalytic converters. The stock gets F’s in Earnings Growth, Earnings Momentum, and Earnings Revisions. Wall Street appears to agree with the stock downgrade, with share prices dropping 26.5% over the past month. For a full analysis of SWC stock, visit Portfolio Grader.

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.