who cares. its a f*cking mining company, not some burglar planning to rob your house. You give your ID every day to various government agencies, telephone companies, utility companies, etc without batting a wink. Hell some buildings don't allow you to enter without seeing your ID, but here you are afraid that it will remain on their servers for ever!!
don't be so dramatic mate.
He has a point though. It's not a regular business you're dealing with, but a scam that will at some point vanish and who knows what they will do with your personal data. By having your ID and some basic details I can take out loans on your name, etc. In other words, no one needs to rob your house when ill minded individuals can rob you digitally.

Intead of taking everyting lightly, which is what average joes tend to do, try and be more paranoid. Your ID is a key, not just some worthless document.