China Nonferrous MiningSTU:3N4 -5.43%58 Operating Margin % is 17.52% as of Dec. 2025, which is 5% below its 10-year median of 18.37. GuruFocus rates STU:3N4 with a GF Score™ of 58/100 and a GF Value™ of €0.52 (Significantly Overvalued). The stock has 1 warning sign investors should review. Among 840 Metals & Mining companies, China Nonferrous Mining ranks better than 72.74% on this metric.
China Nonferrous Mining (STU:3N4) Operating Margin % Explanation
Just like Gross Margin %, it is important to see a company maintains its operating margin over time. Among the same industry, a company with higher operating margin is more efficient in its operation. It is also more stable during industry slowdown or recessions. Peter Lynch prefers those with higher margins than those with lower margins.
Be Aware
Operating Margin % can be manipulated by adjusting the rate of depreciation, depletion and amortization (DDA).
If a company is facing competition, its Operating Margin % may decline. Often the Operating Margin % declines well before the company's Revenue or even profit decline. Therefore, Operating Margin % is a very important indicator of whether the company is facing problems.
For instance, by 2012, Nokia (NOK)'s problems were well known and its stock had lost more than 90% of its market value since 2007. But Nokias Operating Margin % had already been in decline since 2002, although its Earnings per Share (Diluted) were still rising. Investors who paid attention to Operating Margin % would have avoided this huge loss. The same can be said for Research-in-Motion (RIMM).
Therefore, Operating Margin % is a very important screening filter for GuruFocus. GuruFocus's Buffett-Munger screener requires that the profit margin is either consistent or expanding. The Model Portfolio of the Buffett-Munger screener has outperformed the market every year since inception in 2009.
China Nonferrous Mining Operating Margin % Related Terms
China Nonferrous Mining Operating Margin % Historical Data
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The historical data trend for China Nonferrous Mining's Operating Margin % can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
STU:3N4 vs SCCO, FCX: Operating Margin % Comparison
For the Copper subindustry, China Nonferrous Mining's Operating Margin %, along with its competitors' market caps and Operating Margin % data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
China Nonferrous Mining Operating Margin % vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, China Nonferrous Mining's Operating Margin % distribution charts can be found below:
* The bar in red indicates where China Nonferrous Mining's Operating Margin % falls into.
China Nonferrous Mining Operating Margin % Calculation
Operating Margin % - also known as operating income margin, operating profit margin and return on sales (ROS) - is the ratio of Operating Income divided by net sales or Revenue, usually presented in percent.
China Nonferrous Mining's Operating Margin % for the fiscal year that ended in Dec. 2025 is calculated as
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
China Nonferrous Mining (STU:3N4) has a Operating Margin % of 17.52% as of Dec. 2025. Operating margin is the ratio of total operating income to net sales. View historical data on China Nonferrous Mining and its competitors. This is near median its historical median of 18.37. Over the past decade, China Nonferrous Mining's Operating Margin % has ranged from 9.84 to 22.12. According to the industry distribution chart, China Nonferrous Mining ranks #229 out of 840 companies in the Metals & Mining industry, placing it in the top 27.3%.
Is China Nonferrous Mining's Operating Margin % too high?
China Nonferrous Mining's current Operating Margin % of 17.52% is near median its 10-year median of 18.37. Over the past 10 years, this metric has ranged from a low of 9.84 to a high of 22.12. The Metals & Mining industry median Operating Margin % is 5.86. China Nonferrous Mining's value of 17.52% is 199% above this industry median. Based on the distribution chart, China Nonferrous Mining ranks #229 out of 840 companies in the Metals & Mining industry, which is above the industry midpoint. Overall, China Nonferrous Mining has a GF Score™ of 58/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does China Nonferrous Mining's Operating Margin % compare to SCCO and FCX?
According to the Metals & Mining industry distribution chart, China Nonferrous Mining ranks #229 out of 840 companies for Operating Margin %. This puts China Nonferrous Mining in the upper half of its industry. The industry median Operating Margin % is 5.86. China Nonferrous Mining's value of 17.52% is 199% above this benchmark. Historically, China Nonferrous Mining's own Operating Margin % has ranged from 9.84 to 22.12 over the past decade. While the company's 10-year median is 18.37 vs. the industry median of 5.86, China Nonferrous Mining has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Operating Margin % for a Metals & Mining company?
The median Operating Margin % among Metals & Mining companies is 5.86, based on 840 companies in the industry. Companies in the top quartile (top 25%) have a Operating Margin % significantly above this median, while those in the bottom quartile fall well below. However, Operating Margin % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. China Nonferrous Mining's current Operating Margin % of 17.52% is 199% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Operating Margin % mean?
A high Operating Margin % can signal that a stock is expensive relative to its fundamentals. Operating margin is the ratio of total operating income to net sales. View historical data on China Nonferrous Mining and its competitors. For the Metals & Mining industry, the median Operating Margin % is 5.86 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. China Nonferrous Mining's current Operating Margin % is 17.52%, which is near median its own 10-year median of 18.37. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is China Nonferrous Mining stock overvalued right now?
Based on GuruFocus' analysis, China Nonferrous Mining (STU:3N4) is currently considered Significantly Overvalued. The stock's GF Value™ is €0.52, compared to a current price of €1.22 — trading 134.6% above its estimated fair value. The current Operating Margin % is 17.52%, which is near median its 10-year median of 18.37 and 199% above the Metals & Mining industry median of 5.86. China Nonferrous Mining's overall GF Score™ is 58/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Operating Margin % calculated?
Operating Margin % is calculated from a company's financial statements. For China Nonferrous Mining (STU:3N4), the current Operating Margin % is 17.52% as of Dec. 2025. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is China Nonferrous Mining (STU:3N4) Overvalued in 2026?
Based on GuruFocus' analysis, China Nonferrous Mining stock appears to be overvalued.
The current stock price of €1.22 is trading 134.6% above its estimated GF Value™ of €0.52.
GuruFocus considers China Nonferrous Mining to be Significantly Overvalued.
Key valuation signals for STU:3N4:
Operating Margin %: 17.52% (near median its 10-year median of 18.37)
GF Value™: €0.52 vs. price of €1.22 (134.6% above fair value)
Industry Position: 199% above the Metals & Mining median (#229 of 840)
No single metric tells the full story. See the STU:3N4 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
China Nonferrous Mining Corp Ltd is a Company with its subsidiaries are principally engaged in exploration, mining, ore processing, leaching, smelting of copper and cobalt, and sale of copper cathodes, blister copper and copper anodes, copper-cobalt alloy, cobaltous hydroxide and sulfuric acid. Its operating segments are Leaching and Smelting. The majority of the company's revenue is derived from the Smelting segment. The smelting segment includes the production and sale of blister and copper anodes. Geographically, it derives a majority of revenue from Mainland China.
58GF Score
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