Hancock's 2012 results were published last week and suggested that only 70 people were employed within the parent company and its fleet of subsidiaries.

But the amended set of results released today has changed the number of overall employees to 252.

The larger number of employees may explain what appeared to be an unusual disconnect between remuneration and staffing patterns at the company.

The initial set of 2012 results suggested that remuneration to key personnel had more than doubled to $22.22 million in a year when employee numbers had fallen by 44 per cent.

But the amended set of results shows that increases in remuneration were largely in line with increases in staff numbers; employee numbers doubled from 126 in 2011 to 252 in the 2012 financial year.

According to the amended document, there were 20 "principal subsidiaries" in which Hancock had an interest at some stage during the 2012 financial year.

Among them was Roy Hill Holdings; the 70 per cent owned subsidiary through which Ms Rinehart is seeking to build a new iron ore mine, rail and port in Western Australia.

Most other significant details remained unchanged from the initial set of 2012 financial reports; the company still reported an overall profit of $3.2 billion for the year, a number that was inflated by a $1.16 billion deferred tax asset from the mining tax.

Hancock's main source of revenue is from an iron ore joint venture with Rio Tinto in the Pilbara.

The company is also a substantial shareholder in Fairfax Media; the owner of this publication.