The ones I am invested in are all Australian listed (some have a dual listing in Canada). The Australian and Canadian markets (also AIM in London) are where most of the companies are listed.
Take a look at the following gold companies that I really like. Gold is easier to deal with the poor logistics of Africa than the base metals which require shipping large volumes of ore.
My current favourites are Galina (ASX:G1A) which is a lead/silver developer and Aeris Resources (ASX:AIS) a copper producer, but which is currently drilling a very large IOCG deposit in South Australia.
If you are interested in learning about Australian mining companies then take a look at Hot Copper. Watch out as like most stock internet message boards there is a lot of ramping, but there is also a huge amount of useful information there too. Just make sure to check everything you read yourself.
Take a look at the following gold companies that I really like. Gold is easier to deal with the poor logistics of Africa than the base metals which require shipping large volumes of ore.
https://www.rml.com.au
http://www.westafricanresources.com
https://www.cardinalresources.com.au
https://tietto.com
The pictures on Tietto's website really show what mining is like in a lot of Africa without western capital.