Utilize the input text as a context reference, choose the right relationship between 'potash mine' and 'Potash' from the options.
Options: headquarters location, director/manager, position held, product/material produced

WINNIPEG, Manitoba, July 30 Potash Corp of Saskatchewan would finish building and would operate the Legacy potash mine owned by rival K+S, if it acquires the German salt and fertilizer producer, Chief Executive Jochen Tilk said on Thursday.
product/material produced