However, with the current uncertainty within the mining sector, it seems prudent to stick to companies that are profitable now and, with Petra Diamonds offering stronger growth prospects at a more appealing price than Polyus Gold, it seems to be the pick of the three stocks at the present time.
Take context from the input text and decide on the accurate relationship between 'Polyus' and 'mining' from the options provided.
Options: chief executive officer, employer, headquarters location, industry