bitcoin is not untraceable. if you think that, you're a tard. no less traceable than a prepaid visa.
How do you track a prepaid visa? Point of sale (kiosk, online, etc.. Unless dealt in person by proxy buyer like a homeless man, etc. in which case untraceable)
How do you track someone who spends bitcoins he has just freshly mined?
You don't. Only BTC with a history can be traced somewhere. BTC that simply originate from a block and reside in the miner's wallet but have never been moved, have no "identity" nor can it's owner be identified.
The owner could even move his wallet in encrypted USB sticks, sell and buy them, and nobody would ever know until they are spent or sent to an exchange, etc.
it is getting to that point where solo mining is more or less virtually impossible for a single user. if you are part of a pool then you are easily traceable (minus potential proxy lifestyle i suppose, which isnt always guaranteed anonymity, especially if you're constantly dropping multiple data streams to a centrally located server constantly for weeks/months).
To be able to solo mine would require a huge farm at this point, making you stand out like a sore thumb, potentially more than a prepaid visa.
i suppose the only alternative i can think of would be zombie botnets set up to mine coins, but i don't really see that as a terribly viable option either. You might get 50 BTC two or three times a year? Not exactly super criminal money levels.