If you don't have the old wallet anymore then the Bitcoins (AND all additional Bitcoins sent there) are GONE FOREVER. Take care of your wallet files.
Take action quickly and stop the waste. Additionally, start mining somewhere else because:
1) DeepBit takes enormous fees
2) Deepbits market share is much to high destabilizing the Bitcoin economy. There is no need to give them a monopoly (sorry DeepBit owner
, nothing personal)