That's fascinating, my father works in Australian mine sites and I can't wait to tell him about this. He wouldn't be a potential customer, he'd just be fascinated as I am.
I love that this is borne of a real world need for an industry not initially related to software, identifying cross-industry problems is what a lot of founders have trouble doing because they don't have much exposure to other industries.
Applying software to other industries is what really gets me excited. Do you mind me asking what city you're currently operating from? Good work identifying the problem and building a solution, good luck and I wish you all the best.