From my research you can find some garnet pricing on sellers...

From my research you can find some garnet pricing on sellers websites globally
the usa import export data also gives a pricing
eessentially from what I have worked out wholesale pricing to distributor is roughly 15 to 20 % below what customer pays

so export pricing out of Australia best guesbs 300 to 350 usd per ton or circa 500 aud per ton

with volume 120ktons plus operating costs should drop below all in costs stated in annual report

simple conservative maths
aassume $100 ro 150 bucks per ton ebitda per ton is achievable...meaning 130k tons. 13million ebitda per year for 30 plus years..if that makes sense