Utilize the input text as a context reference, choose the right relationship between Impala Platinum and mining from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Anglo American Platinum and Impala Platinum Holdings are the two largest mining companies operating in Zimbabwe and have previously expressed reservations with complying with the empowerment law.

Answer: industry