You can withdraw CCRB from your mining ewallet,when you have minimum 40 number of CCRB in your mining wallet .You can withdraw this to CCRBX exchange .You can convert this into gift codes and transfer to other memebers. You can also convert your CCRB into other Crypto currencies of your choice or can also transfer to other exchanges where CCRB is listed(eg:Livecoin,BTC alpha).

If you find that you are unable to withdraw your crypto currency from the exchange , then it is likely to be down to one of two reasons: Either you don’t have sufficient funds in your internal wallet to cover the required withdrawal fees for your specified crypto currency, or you have mistakenly sent it to a non-existent wallet address. Please check the above two things first if you are unable to withdraw. 

please see withdrawal limits in CCRBX exchange