We're pleased to report that Mineral Resources shareholders have received a total shareholder return of 25% over one year. However, the TSR over five years, coming in at 39% per year, is even more impressive. Potential buyers might understandably feel they've missed the opportunity, but it's always possible business is still firing on all cylinders. It's always interesting to track share price performance over the longer term. But to understand Mineral Resources better, we need to consider many other factors. To that end, you should be aware of the 1 warning sign we've spotted with Mineral Resources.