Ann: Half Yearly Report and Accounts, page-97

I was running and listening to John Polomny podcast today. An idea came to my mind.

PEN secured 4.5m US$ for maximum contract penalty.
They spent 1.5 m US$ to fulfill this nearest contract (buying at 64$ from SPOT and selling for 56,5$ with a loss. 200k lbs * 7,5$ = 1.5m US$).

If they realized important problem with extraction, why they didn't go for full 4.5m US$ SPOT buying? That will give them 3 times more pounds and less penalties. Instead of that, they choose to mine it by itself...