I am using geographic datasets of households (clusters) and mines in Ghana,Sierra Leone, and Liberia (I am analyzing each country separately). I am trying to calculate the distance between each clusters and the nearest mine using QGIS 3.22.7. The locations are measured in latitudes and longitudes, so the layers are in WGS 84 EPSG 4326.
I have learned that it is best to reproject the layers in Projected Coordinate reference System first before calculating distances and buffers to avoid errors. For the sake of consistency and uniformity, it appears that WGS 84 UTM would be the best projection for all 3 countries. However, I could not find any projected CRS that covers the entire country of Sierra Leone; for instance, UTM 29N only covers the eastern part of Sierra Leone.
Which projected CRS would be best for Sierra Leone in terms of coverage and for minimizing errors when calculating distances and buffers?