These "miners" are bound to reduce the available DNA for researchers that do work within this field, humans likely killed off the mammoth - if we brought it back it could serve to upkeep large quantities of open grounds (believe it or not but herds are important to grasslands and soilvalue).
Either there should be a larger rewards than the bones can offer and a get out of jail freecard for the offense if fresh DNA or what to is believed to be such is found (so that scientifical extraction is possible on site).
Or the regulation should be strengthened, both the governement and the criminal networks should realise what a potential goldmine living and breeding mammothherds could be for russia...