I do not know much about this site and I have seen their domain to have been registered for long, this should be of of the old clod mining sites that make use of hyip that will later go bad and many investors will later lose their money. If you want to mine Bitcoin, there are only few mining pools, you will have to join one but you will still need a power ASIC which could visit thousands of dollars and you will still have to research and read more about if it is profitable in your location or not as mining equipments require cold weather, cheap and constant electricity. Avoid that site if you want to avoid scam.