Mineral Resources Limited Annual Report 2014  71 Past due but not impaired Customers with balances past due but without provision for impairment of receivables amount to $29,906,000 as  at 30 June 2014 ($9,959,000 as at 30 June 2013). The Consolidated Entity did not consider a credit risk on the aggregate balances after reviewing credit terms of  customers based on recent collection practices. The ageing of the past due but not impaired receivables are as follows: For personal use only 30 June 2014 Notes to the Financial Statements These relate to a number of independent customers for whom there is no recent history of default.  Consolidated 30 June 2014 $’000 30 June 2013 $’000 61-90 days overdue 25,436  803  Over 90 days overdue 4,470  9,156  29,906  9,959  Notes to the  Financial  Statements Consolidated 30 June 2014 $’000 30 June 2013 $’000 Construction contracts Contract costs incurred to date 300,943  100,575  Profit recognised to date 6,202  13,685  307,145  114,260  Less: Progress billings received and receivable (434,336) (142,254) Net construction work in progress (127,191) (27,994) Representing: Amounts due from customers included in trade receivables 5,038  10,591  Amounts due to customers included in trade and other payables (note 20) (132,229) (38,585) (127,191) (27,994) Consolidated 30 June 2014 $’000 30 June 2013 $’000 Raw materials and stores 10,557  17,101  Ore inventory stockpiles 77,000  37,680  Work in progress 23,483  20,908  111,040  75,689  NOTE 11. CURRENT ASSETS - INVENTORIES