You have done well by bringing this up a lot of people have forgotten about mining here in Nigeria and the reason for not mining in Nigeria is because of the cost and since there is no steady electricity supply, when you talk about mining you need a lot of data and you know how costly data now is in Nigeria it is very costly so a lot of people don't get involved in mining anymore however they are still some people who are still mining here in Nigeria but they are not much and since there's no steady electricity supply people find it difficult to mine.
However there are some areas here in Nigeria that has steady power supply but some areas in Nigeria don't have steady power supply, those set of people that are staying in those areas that has steady powers supply may be the ones that are actively involved in mining and those that are not staying in those areas may not be interested to mine Bitcoin.
I will advise that if you cannot mine Bitcoin then you can accumulate Bitcoin and hold, the cost of mining bitcoin here in Nigeria can get you good amount of Bitcoin if you buy it.