This week, 6 Metals & Mining stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Royal Gold, Inc.’s (RGLD) ratings are up from a B last week to a A. Royal Gold, Inc. acquires and manages gold, silver, copper, lead and zinc royalties. The company also gets A’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of RGLD stock.

SunCoke Energy Partners LP (SXCP) gets a higher grade this week, advancing from a C last week to a B. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of SXCP stock.

Tahoe Resources Inc. (TAHO) boosts its rating from a B to a A this week. Tahoe Resources Inc. acquires, explores and develops resource properties in the Americas for the mining of precious metals, primarily silver. The company also gets A’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TAHO stock.

Mountain Province Diamonds Inc.’s (MDM) ratings are looking better this week, moving up to a A from last week’s B. Mountain Province Diamonds Inc. explores and develops diamond properties. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of MDM stock.

Gold Fields Limited Sponsored ADR (GFI) earns a A this week, jumping up from last week’s grade of B. Gold Fields Limited Sponsored ADR is engaged in the mining, exploration, extraction, processing, and smelting of gold. The company also gets A’s in sales growth, earnings growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GFI stock.

Mechel PAO Sponsored ADR (MTL) improves from a D to a B rating this week. Mechel PAO Sponsored ADR is a Russian metals and mining company, uniting producers of steel, rolled products, hardware, coal, iron ore concentrate, and nickel. The company also gets A’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of MTL 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.