This week, the ratings of nine metals and mining stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

North American Palladium (PAL) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). North American Palladium is a mineral exploration and production company. In Portfolio Grader’s specific subcategories of Earnings Revisions, Equity and Cash Flow, PAL also gets an F. To get an in-depth look at PAL, get Portfolio Grader’s complete analysis of PAL stock.

SilverCrest Mines Inc. (SVLC) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. SilverCrest Mines is a producing silver and gold mining company with a portfolio of precious metals deposits as exploration properties in Mexico. In Earnings Growth, Cash Flow, Margin Growth and Sales Growth the stock gets F’s. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of SVLC stock.

Grupo SIMEC SAB de CV Unsponsored ADR Class B’s (SIM) rating weakens this week, dropping to an F versus last week’s D. Grupo Simec manufactures, processes, and distributes special bar quality (SBQ) steel and structural products primarily in the United States, Mexico, and Canada. The stock gets F’s in Earnings Momentum and Earnings Revisions. To get an in-depth look at SIM, get Portfolio Grader’s complete analysis of SIM stock.

Mesabi Trust (MSB) earns a D this week, moving down from last week’s grade of C. Mesabi Trust operates as a grantor trust in the United States. Shares of the stock are being traded at a very rapid pace, up 791.1% from the week prior. For more information, get Portfolio Grader’s complete analysis of MSB stock.

The rating of Kinross Gold Corporation (KGC) declines this week from a C to a D. Kinross Gold is involved in the exploration, development, and production of gold in countries located around the world. The stock gets F’s in Earnings Growth, Earnings Momentum, Equity and Cash Flow. To get an in-depth look at KGC, get Portfolio Grader’s complete analysis of KGC stock.

Southern Copper Corporation (SCCO) is having a tough week. The company’s rating falls from a C to a D. Southern Copper is an integrated copper producer. The stock also rates an F in Earnings Revisions. For more information, get Portfolio Grader’s complete analysis of SCCO stock.

Allied Nevada Gold (ANV) earns an F this week, moving down from last week’s grade of D. Allied Nevada Gold engages in the evaluation, acquisition, exploration, and advancement of gold exploration and development projects. The stock gets F’s in Earnings Growth, Earnings Revisions and Equity. Cash Flow and Margin Growth also get F’s. As of Feb. 6, 2015, 25.3% of outstanding Allied Nevada Gold shares were held short. To get an in-depth look at ANV, get Portfolio Grader’s complete analysis of ANV stock.

Slipping from a C to a D rating, Keegan Resources (KGN) takes a hit this week. Keegan Resources, a junior gold company, engages in the exploration and development of gold properties in Ghana, west Africa. The stock gets F’s in Equity and Cash Flow. For more information, get Portfolio Grader’s complete analysis of KGN stock.

IAMGOLD Corporation (IAG) experiences a ratings drop this week, going from last week’s C to a D. IAMGOLD is involved in the exploration for, and development and production of mineral resource properties throughout the world. The stock receives F’s in Earnings Growth, Earnings Revisions and Equity. Cash Flow and Margin Growth also get F’s. To get an in-depth look at IAG, get Portfolio Grader’s complete analysis of IAG 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.