The minimum deposit may vary between casinos. Since one BTC is can be worth anything from 20,000 GBP to 50,000 GBP at any given time, it clear that a minimum deposit of 1 BTC would not make any sense at all. We took a look at some BTC casinos and most casinos seem to have a minimum deposit of 0.0001 to 0.0002, which is just about in line with fiat currency casinos. Please note that redeeming a casino deposit bonus might bring forth additional requirements.