Dragon Mining Limited (HKG:1712) shareholders would be excited to see that the share price has had a great month, posting a 37% gain and recovering from prior weakness. The last month tops off a massive increase of 114% in the last year.

After such a large jump in price, given around half the companies in Hong Kong have price-to-earnings ratios (or "P/E's") below 9x, you may consider Dragon Mining as a stock to potentially avoid with its 12.3x P/E ratio. However, the P/E might be high for a reason and it requires further investigation to determine if it's justified.

Dragon Mining certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. It seems that many are expecting the strong earnings performance to beat most other companies over the coming period, which has increased investors' willingness to pay up for the stock. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

In order to justify its P/E ratio, Dragon Mining would need to produce impressive growth in excess of the market.

Retrospectively, the last year delivered an exceptional 109% gain to the company's bottom line. However, this wasn't enough as the latest three year period has seen a very unpleasant 55% drop in EPS in aggregate. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 21% shows it's an unpleasant look.

With this information, we find it concerning that Dragon Mining is trading at a P/E higher than the market. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On Dragon Mining's P/E

Dragon Mining shares have received a push in the right direction, but its P/E is elevated too. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

Our examination of Dragon Mining revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Having said that, be aware Dragon Mining is showing 2 warning signs in our investment analysis, you should know about.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.