Nintendo has managed to finish dead last in a recent conflict minerals ranking table put together by the Enough Project.

In an effort to support the Raise Hope for Congo campaign, the group has outlined companies with a lackadaisical approach to ensuring their supply chains remain free of minerals mined in the African country, where armed groups fight to control the mines.

The resulting tin, tantalum and tungsten are sold, with the funds used to supply Congolese forces thought to be responsible for millions of deaths since 1996.

Nintendo came in at zero on the chart, where higher is better. Sony scored 27, Microsoft and Apple tied at 38, and Intel topped the rankings with 60.

According to the report, Nintendo has been unresponsive to repeated outreach efforts, has not undertaken any known efforts to investigate its supply chains, did not include conflict minerals in its audit policy and did not join the Public Private Alliance or participate in a program to source clean minerals from Congo.

Nintendo has responded to concerns raised by CNN by stating that it "outsources the manufacture and assembly of all Nintendo products to our production partners and therefore is not directly involved in the sourcing of raw materials that are ultimately used in our products.

"We nonetheless take our social responsibilities as a global company very seriously and expect our production partners to do the same."