Bitcoin mining is a process that allows Bitcoin to be created and circulated within the Bitcoin network. Miners use specialised hardware and software to solve complex mathematical problems, and in doing so they are rewarded with Bitcoin.
The amount of Bitcoin that a miner can earn is directly proportional to their hashrate – that is, the speed at which they are able to solve the mathematical problems.
A hashrate of 1 TH/s (terahash per second) is equivalent to 1,000 GH/s (gigahashes per second). Currently, the highest hashrate achievable by a single piece of consumer hardware is around 44 TH/s, and is achieved by the Bitmain Antminer S9.
So, how much Bitcoin can you mine with a 1070? If we assume that you have access to an Antminer S9 and you are able to run it at its maximum hashrate of 44 TH/s, then you would be able to mine approximately 0.0024 BTC per day.
This would give you a return on investment (ROI) of around 150 days – that is, it would take you 150 days to earn back the cost of the Antminer S9 through Bitcoin mining.
Of course, this is just a hypothetical example – in reality, your hashrate will be lower and your ROI will likely be higher. However, it should give you an idea of how much Bitcoin you can expect to mine with a 1070.