The mail empire of west africa was known far and wide for the great wealth

The statement is true.

the Mali Empire was a large empire in Western Africa. It was the dominant force in the region, being by far the wealthiest, military strongest, and it was also superior in its architecture and development compared to the others in the region.

The empire was well known for its excellent organization in its cities and social life, but it was the enormous wealth of this empire that was attracting the most interest and curiosity. The Mali Empire was very rich in gold, and since the gold was the most valuable thing it made lot of other empires to envy it. The empire had so much gold that its emperor Mansa Musa is considered to have been the richest man in the whole human history.

it proved indian land claims were unjustified.