a bargain buy at 90c, page-5

You can't use cash cost. You gotta use total cost.

PRU reported cash cost of 500-600$ but also reported total site cost of 1000$/oz.

On top of that there is debt to consider, mine life and how much work has been done on the deposit (like how much is moved into measured/indicated category).

Typical investor mistake to use the published cash cost and saying this is a strong buy.