What is the relationship between 'potash mine' and 'Potash' in the context of the input sentence.
Options: product/material produced, headquarters location, position held, director/manager

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