significant sulphides, page-5

Acording to the 31/03/08 update 30,000 tonnes is currently stockpiled at the plant, and another 60,000 tonnes is ready to go.
But according to the April release GBM have up to 120,000 tonnes of tailings to process.

Doesn't 100kg concentrate per 100t of feedstock = 1kg per 1 tonne? Which = 120,000kg of concentrate in total?
According to the April release they were targeting 1g/t.
If they can get 13% from the concentrate isn't that 130g/t?

I know that they probably wont recover 100% from the concetrate, but I must have a decimal point wrong somewhere? Help!