Refer to the input text as context and select the correct relationship between 'potash mine' and 'Potash' from the available options.
Options: headquarters location, position held, product/material produced, 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