Bitcoin mining was taken into account using the capacities of Avalon 6, AntMiner S7 and S9, taking into account the cost of electricity. The cheapest minigame in Venezuela. There the cost of 1 BTC is only 551$. Only the question will be resolved in this country by the state authorities. After all, in Venezuela crypto-currencies are banned. Therefore, you can not do business in this country. You can go to jail. In Russia, the prime cost of mining is 4675$. The most expensive mining in South Korea is 26170$. Mine the crypto currency in this country can only be at a loss. At the same time, the cost of equipment purchase and maintenance was not taken into account. So the production cost of Bitcoin will be much higher than the figures indicated.