On their steel plant public consultation invitation it's $4 billion, http://www.gladstonesteelproject.com.au/pdf/Boulder%20Steel%20Community%20Consult.pdf
On Queensland Government site it's $2.8 billion, http://www.dlgp.qld.gov.au/projects/mining-and-mineral-processing/steel/gladstone-steel-making-facility.html
On Boulder Steel project home page it's $1.8 billion, http://www.gladstonesteelproject.com.au/index.html
A big difference, I phoned Carl Moser to shed a little light on the quoted variations this afternoon,
$1.8 billion is the 1st stage $2.8 billion is the plant cost $4.0 billion is the total cost including infrastructure
BGD Price at posting:
10.0¢ Sentiment: None Disclosure: Held