I think it's better to talk to your accountant, about this. Secondly, why would you add up your coins at the end of the year? Are you going to report the value of the coins? Last time i checked there is no requirement to report your assets.
Exactly, that advice makes absolutely no sense because there is not a recognition event either. There is no requirement to report the assets unless they are held with a financial institution (FBAR).
To get the lay of the land and the reasonable approaches you may want to pick up a copy of A Lawyer's Take On Bitcoin And Taxes.
If your mining equipment is part of computer equipment used in an ordinary trade or business and is dual purposed then it could be completely reasonable to take a 179 deduction on the equipment and use it to offset income from the business and have no recognition from the mined coins because you have not converted them to fiat or used them in a transaction.