copper is mined in ghana. The information on copper mining is rather scattered and therefore difficult to get.
This are some of the known copper companies
1 Deco Metal Minners Ltd. Post Office Box Ds.871 Dansoman-accra West-africa .
2 Obausidia Gold Mining Limited
there is definitely copper in ghana. There are a couple of companies that deals with copper mining so you can check them up in any of the business directories