The limestone is from a pit they have only a couple of kms from LL.
The plant uses 100k tons of lime per annum guessing it would cost around $15 a ton to mine and transport.
SO $1.5M in OPEX per annum
The techncal report shows all consumables costing $104.00 per Au oz equivalent out of a total OPEX of $307 an oz.
They did try using acid initially but found an alkaline (with limestone OH- ions) process best.
albion process acid requirements., page-14
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