Actually, you don't mine anything there, it looks like simulation of mining. Nobody can tell for sure in what is that site investing money, or is it ponzi. There are no proofs of mining or other investments, and its strange that site is operational for almost a year.
To OP can you tell us how long do you "mine" 0.003BTC? And how long are you investing there through faucets?
I currently have ~20 CLD and it currently 'mines' 0.00001126 BTC an hour, I have made 2 withdraws of 0.0035 BTC, taking around 300 hours to reach 0.0035 doing the math, which the time taken decreases every weak from the extra CLD you get from faucets.