During the GFC a fair few mines closed pretty quickly. It's a...

During the GFC a fair few mines closed pretty quickly.

It's a reasonable due diligence question and if you are not asking about the contract clauses, then any ARR figures might be meaningless in a downturn. The reality is it is much easier to shut a mine overnight than it is a Nursing Home or Hotel. A Nursing Home or Hotel, would usually keep operating even in administration, whereas a mine is less likely to do this.  

All I am trying to establish is what sort of protection (contractual / revenue) Swift would have if there was an industry downturn in mining, not exactly rosy out there with Brexit, US shutdown, US/China trade issues and lots of poor economic data. 

If no one knows, no problem, but something that I would need to understand better from management, as a month to month contract extension creates revenue risks that don't exist with a 3 year extension with guaranteed revenue!

If timeframes and revenues were guaranteed, you would expect that would be important information worth mentioning!!