Does a strip ratio of 0.64 mean that for every tonne of earth...

Does a strip ratio of 0.64 mean that for every tonne of earth moved, 640kg is dirt or 640kg is put through the plant?

61,296 / 144,672 * 75,000 * 12 = 381,320t of IO product.

Seeing as we don't know how much is owed by debtors, it's hard to reconcile how much we are selling it per tonne.
I've heard $43pt is fair. Can someone please provide a $ figure?

If $43 is what they're selling it for, then revenue can be around $16.4m. With developement, production and admin costs expected to be $3m next quarter (or $12m pa), that only leaves around $4m profit. Cutting it fine I think.

Anyone else done some 'back of the envelope' calcs?