Could this be a reason to sell Sirius Minerals plc?

Cost overruns could derail the Sirius Minerals plc (LON: SXX) investment thesis.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

I’ve been bullish on the outlook for the Sirius Minerals (LSE: SXX) for some time. The company has a bright future ahead of it if management can bring the flagship North Yorkshire potash project in on time and budget. 

However, even though Sirius looks as if it’s on track to achieve all of its goals today, mining is a highly unpredictable business, and there’s still plenty that could go wrong for the firm.

So, while I have been bullish on the outlook for Sirius in the past, I’m going to take a look at the bear case within this article.

Protect the downside

The biggest risk to its operations is the potential for cost overruns. As mentioned above, Sirius looks to be on track at the moment, but the company is yet to begin construction of the mine. So far, construction on the site has been limited to preparation work and infrastructure development, both of which are relatively straightforward tasks compared to building an underground mine.

The big problem with mine development is that costs can quickly spiral out of control. Building a mine is not a cheap or simple process, and things are bound to go wrong. Unfortunately, if something does go wrong, especially in an underground mine shaft, it could cost millions to fix the problem and delay the project by weeks.

Hopefully, Sirius management has considered cost overruns in the construction budget, which should provide a financial cushion. Still, the odds are stacked against the company. Around 60% of mining projects exceed initial cost and time estimates, and as Sirius is trying to develop a mine in a national park, the likelihood of the company having to make costly last-minute adjustments is high.

That said, operating in a national park may turn out to be advantageous for Sirius. If the company finds itself in a dire financial position during the construction process, authorities are unlikely to let it collapse. Sirius has only been granted planning permission on the condition that the mine fits in with the natural environment when finished. With this being the case, authorities are unlikely to let the firm collapse halfway through the construction process, leaving an area of natural beauty looking like a construction site. 

So if the company finds itself in a sticky position, authorities may step in to help the business. However, this will likely be bad news for shareholders. Rights issues and placings to raise as much cash as possible will likely precede any such state takeover.

Of course, this is the worst case scenario and investors will have plenty of time to dump their shares in Sirius as the company’s troubles build.

The bottom line

Overall, Sirius still looks like a great long-term investment, but as with any business, the company’s future is not risk-free. Investors need to keep an eye on the firm as its construction progresses to make sure they don’t get caught out by a sudden cash call.

Rupert Hargreaves has no position in any shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

Is 50 too old to start buying shares?

Christopher Ruane explains why 'better late than never' is key to his thinking about whether 50's too old to start…

Read more »

Two male friends are out in Tynemouth, North East UK. They are walking on a sidewalk and pushing their baby sons in strollers. They are wearing warm clothing.
Investing Articles

Here’s what £150 a month in a Junior ISA could be worth by 2045…

You might be surprised to learn by how large a Junior ISA portfolio could become inside 20 years from modest…

Read more »

Investing Articles

This red hot equity fund in my SIPP returned 12.6% in the first 2 months of 2026

This global equity fund is delivering huge returns for Edward Sheldon’s SIPP in 2026, despite all the risks and uncertainty…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

Want to retire richer? Here’s Warren Buffett’s golden rule to build wealth

If you want to build wealth for a richer retirement, then following Warren Buffett’s golden rule might be the best…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Get ready for stock market volatility…

As conflict in the Middle East makes share prices fluctuate, what strategies can investors use to try and find opportunities…

Read more »

British Isles on nautical map
Investing Articles

Why the FTSE 100 fell almost 5% this week

Declines in mining shares dragged the FTSE 100 down after a strong start to the year. Is the pullback an…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

How much do you need to invest in US stocks to earn a £2,000 monthly passive income?

Is it possible to target several thousand pounds of passive income each month by buying US growth stocks? Absolutely –…

Read more »

A mature woman help a senior woman out of a car as she takes her to the shops.
Investing Articles

How big does your ISA need to be to earn £1,000 a month in passive income?

Andrew Mackie explains how a long-term ISA strategy can help investors build a chunky £12,000 passive income in less than…

Read more »