The Niger Basin is the name that has been given to the shipwreck located at position 27.59.26.9N/34.27.15.6E. It is believed to have sank in May of 1982.
The only reference to a ship named “Niger Basin” that has been found to date is that the ship was originally built as the 8,927 GRT Cargo Ship Tanganyika and was renamed numerous times over the ship’s lifetime, one of those names being the Niger Basin. However, the ship was supposedly broken up at Alang on 28 May 1997 as the Lia P.. So this is most likely not the ship in question.