The June 6th filing is simply their News Release...(more)...on their infill drilling.
The first two June 8th filings at 17:10:19 are english and french versions of their short form prospectus filing to potentially sell $300,000,000 in shares. A shelf registration is a first step, and saves considerable time if & when they want to sell shares. It does not mean they intend to sell that many. It does mean they could. If I recall, the term shelf is used, because they could just put this on the shelf and not sell any shares now. Don't bet on that. But, I think they could sell portions of the total amount at various times. It does signal dillution. This filing is valid for 25 months.