Analysis of education of Top 21-30. Forbes World’s Billionaires List. The Richest in 2021. MINING & METALLURGY.

8 out of 10 Billionaires graduated from the university.
Of these,
4 have education in business and economics,
1 - metallurgy and mining. (However, he has two educations: in mining and economics.)
1 Billionaires  is PhD.

Thus, 4 out of 8 billionaires of mining from Top 21-30 have an business and economics education and only 1 has an education in metallurgical & mining.

Ph.D. Natalia Petrovskaya

 References

1. https://www.forbes.com
2. https://www.wikipedia.org