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Provisions (Policies) | 12 Months Ended
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Jun. 30, 2021
Statement [Line Items] |
Significant events |
Key judgements and estimates
Judgements
The outcomes of litigation are inherently difficult to predict and significant judgement has been applied in assessing the likely outcome of legal claims and determining which legal claims require recognition of a provision or disclosure of a contingent liability. The facts and circumstances relating to these cases are regularly evaluated in determining whether a provision for any specific claim is required.
Management has determined that a provision can only be recognised for obligations under the Framework Agreement and Samarco Germano dam decommissioning as at 30 June 2021. It is not yet possible to provide a range of possible outcomes or a reliable estimate of potential future exposures to BHP in connection to the contingent liabilities noted below, given their status.
Estimates
The provisions for Samarco dam failure and Samarco Germano dam decommissioning currently reflect the estimated remaining costs to complete Programs under the Framework Agreement and estimated costs to complete the Germano dam decommissioning and require the use of significant judgements, estimates and assumptions. Based on current estimates, it is expected that approximately 85 per cent of remaining costs for Programs under the Framework Agreement will be incurred by December 2023.
While the provisions have been measured based on latest information available, likely changes in facts and circumstances in future reporting periods may lead to material revisions to these estimates. However, it is currently not possible to determine what facts and circumstances may change, therefore revisions in future reporting periods due to the key estimates and factors outlined below cannot be reliably measured.
The key estimates that may have a material impact upon the provisions in the next and future reporting periods include:
• |  | number of people eligible for financial assistance and compensation and the corresponding amount of expected compensation
• |  | costs to complete key infrastructure programs, including resettlement of the Bento Rodrigues, Gesteira and Paracatu communities
The provisions may also be affected by factors including but not limited to:
• |  | resolution of existing and potential legal claims in Brazil and other jurisdictions, including the impact of ongoing settlement negotiations and outcome of the United Kingdom group action complaint
• |  | potential changes in scope of work and funding amounts required under the Framework Agreement including the impact of the decisions of the Interfederative Committee along with further technical analysis, community participation required under the Governance Agreement and rulings made by the 12 th Federal Court
• |  | the outcome of ongoing negotiations with State and Federal Prosecutors, including review of Fundação Renova’s Programs as provided in the Governance Agreement
• |  | actual costs incurred
• |  | resolution of uncertainty in respect of the nature and extent of Samarco’s long-term cash generation
• |  | costs to complete the Germano dam decommissioning
• |  | updates to discount and foreign exchange rates
• |  | the outcomes of Samarco’s judicial reorganisation (defined below).
Given these factors, future actual expenditures may differ from the amounts currently provided and changes to key assumptions and estimates could result in a material impact to the provision in the next and future reporting periods.
Income tax expense |
Key judgements and estimates
Income tax classification
Judgements: The Group’s accounting policy for taxation, including royalty-related taxation, requires management’s judgement as to the types of arrangements considered to be a tax on income in contrast to an operating cost.
Deferred tax
Judgements: Judgement is required to determine the amount of deferred tax assets that are recognised based on the likely timing and the level of future taxable profits. Judgement is applied in recognising deferred tax liabilities arising from temporary differences in investments. These deferred tax liabilities caused principally by retained earnings held in foreign tax jurisdictions are recognised unless repatriation of retained earnings can be controlled and is not expected to occur in the foreseeable future.
Estimates: The Group assesses the recoverability of recognised and unrecognised deferred taxes, including losses in Australia, the United States and Canada on a consistent basis. Estimates and assumptions relating to projected earnings and cash flows as applied in the Group impairment process are used for operating assets.
Uncertain tax matters
Judgements: Management applies judgements about the application of income tax legislation and its interaction with income tax accounting principles. These judgements are subject to risk and uncertainty, hence there is a possibility that changes in circumstances will alter expectations, which may impact the amount of tax assets and tax liabilities, including deferred tax, recognised on the balance sheet and the amount of other tax losses and temporary differences not yet recognised.
Where the final tax outcomes are different from the amounts that were initially recorded, these differences impact the current and deferred tax provisions in the period in which the determination is made.
Measurement of uncertain tax and royalty matters considers a range of possible outcomes, including assessments received from tax authorities. Where management is of the view that potential liabilities have a low probability of crystallising, or it is not possible to quantify them reliably, they are disclosed as contingent liabilities (refer to note 34 ‘Contingent liabilities’).
Inventories |
Key estimates
Accounting for inventory involves the use of estimates, particularly related to the measurement and valuation of inventory on hand within the production process. Key estimates, including expected metal recoveries and work in progress volumes, are calculated by engineers using available industry, engineering and scientific data. Estimates used are periodically reassessed by the Group taking into account technical analysis and historical performance. Changes in estimates are adjusted for on a prospective basis.
Property, plant and equipment |
Key judgements and estimates
Judgements: Exploration and evaluation expenditure results in certain items of expenditure being capitalised for an area of interest where a judgement is made that it is likely to be recoverable by future exploitation or sale, or where the activities are judged not to have reached a stage that permits a reasonable assessment of the existence of reserves.
Estimates: Management makes certain estimates and assumptions as to future events and circumstances, in particular when making quantitative assessment of whether an economically viable extraction operation can be established. These estimates and assumptions may change as new information becomes available. If, after having capitalised the expenditure under the policy, new information suggests that recovery of the expenditure is unlikely, the relevant capitalised amount is charged to the income statement.
Key judgements and estimates
Judgements: Development activities commence after project sanctioning by the appropriate level of management. Judgement is applied by management in determining when a project is economically viable.
Estimates: In determining whether a project is economically viable, management is required to make certain estimates and assumptions as to future events and circumstances, including reserve estimates, existence of an accessible market and forecast prices and cash flows. Estimates and assumptions may change as new information becomes available. If, after having commenced the development activity, new information suggests that a development asset is impaired, the appropriate amount is charged to the income statement.
Key judgements and estimates
Judgements: Judgement is applied by management in determining the components of an ore body.
Estimates: Estimates are used in the determination of stripping ratios and mineral reserves by component. Changes to estimates related to life-of-component waste-to-ore (or mineral contained) strip ratios and the expected ore production from identified components are accounted for prospectively and may affect depreciation rates and asset carrying values.
Key estimates
The determination of useful lives, residual values and depreciation methods involves estimates and assumptions and is reviewed annually. Any changes to useful lives or any other estimates or assumptions may affect prospective depreciation rates and asset carrying values. The table below summarises the principal depreciation methods and rates applied to major asset categories by the Group.
|  | Category |  | Buildings |  | Plant and equipment |  | Mineral rights and petroleum interests |  | Capitalised exploration, evaluation and development expenditure |  |
|  | Typical depreciation methodology |  | SL |  | SL |  | UoP |  | UoP |  |
|  | Depreciation rate |  | 25-50 years |  | 3-30 years |  | Based on the rate of depletion of reserves |  | Based on the rate of depletion of reserves |  |
Impairment of non-current assets |
Key judgements and estimates
Judgements: Assessment of indicators of impairment or impairment reversal and the determination of CGUs for impairment purposes require significant management judgement.
Indicators of impairment may include changes in the Group’s operating and economic assumptions, including those arising from changes in reserves or mine planning, updates to the Group’s commodity supply, demand and price forecasts, or the possible additional impacts from emerging risks such as those related to climate change and the transition to a low carbon economy and pandemics similar to COVID -19.
Climate change
Impacts related to climate change and the transition to a lower carbon economy may include:
•   demand for the Group’s commodities decreasing, due to policy, regulatory (including carbon pricing mechanisms), legal, technological, market or societal responses to climate change, resulting in a proportion of a CGU’s reserves becoming incapable of extraction in an economically viable fashion
•   physical impacts related to acute risks resulting from increased severity of extreme weather events, and those related to chronic risks resulting from longer-term changes in climate patterns
The Group continues to develop its assessment of the potential impacts of climate change and the transition to a low carbon economy. As outlined in the Basis of Preparation, where sufficiently developed, the potential financial impacts on the Group of climate change and the transition to a low carbon economy have been considered in the assessment of indicators of impairment, including:
•   the Group’s current assumptions relating to demand for commodities and carbon pricing, including their impact on the Group’s long-term price forecasts
•   the Group’s operational emissions reduction strategy
COVID-19
The macro economic disruptions relating to COVID-19 and mitigating actions enforced by health authorities create uncertainty in the Group’s operating and economic assumptions, including commodity prices, demand and supply volumes, operating costs, and discount rates.
However, given the long-lived nature of the majority of the Group’s assets, COVID-19 did not, in isolation, result in the identification of indicators of impairment for the Group’s asset values at 30 June 2021.
Due to ongoing uncertainty as to the extent and duration of COVID-19 restrictions and the overall impact on economic activity, actual experience may materially differ from internal forecasts and may result in the reassessment of indicators of impairment for the Group’s assets in future reporting periods.
Estimates: The Group performs a recoverable amount determination for an asset or CGU when there is an indication of impairment or impairment reversal.
When the recoverable amount is measured by reference to FVLCD, in the absence of quoted market prices or binding sale agreement, estimates are made regarding the present value of future post-tax cash flows. These estimates are made from the perspective of a market participant and include prices, future production volumes, operating costs, capital expenditure, closure and rehabilitation costs, tax attributes, risking factors applied to cash flows and discount rates. The cash flow forecasts may include net cash flows expected from the extraction, processing and sale of material that does not currently qualify for inclusion in ore reserves. Reserves are included in the assessment of FVLCD to the extent that it is considered probable that a market participant would attribute value to them.
When recoverable amount is measured using VIU, estimates are made regarding the present value of future cash flows based on internal budgets and forecasts and life of asset plans. Key estimates are similar to those identified for FVLCD, although some assumptions and values may differ as they reflect the perspective of management rather than a market participant.
All estimates require management judgements and assumptions and are subject to risk and uncertainty that may be beyond the control of the Group; hence, there is a possibility that changes in circumstances will materially alter projections, which may impact the recoverable amount of assets/CGUs at each reporting date.
The most significant estimates impacting the Group’s recoverable amount determinations: Commodity prices Commodity prices were based on latest internal forecasts which assume short-term market prices will revert to the Group’s assessment of long-term price. These price forecasts reflect management’s long-term views of global supply and demand, built upon past experience of the commodity markets and are benchmarked with external sources of information such as analyst forecasts. Prices are adjusted based upon premiums or discounts applied to global price markers based on the location, nature and quality produced, or to take into account contracted prices. Future production volumes Estimated production volumes were based on detailed data and took into account development plans established by management as part of the Group’s long-term planning process. When estimating FVLCD, assumptions reflect all reserves that a market participant would consider when valuing the respective CGU, which in some cases are broader in scope than the reserves that would be used in a VIU test. In determining FVLCD, risk factors may be applied to reserves which do not meet the criteria to be treated as proved. Operating costs and capital expenditure Operating costs and capital expenditure were based on internal budgets and forecasts and life of asset plans. Cost assumptions reflect management experience and expectations. In the case of FVLCD, cash flow projections include the anticipated cash flow effects of any capital expenditure to enhance production or reduce cost where a market participant may take a consistent view. VIU does not take into account future development. Discount rates The Group uses real post-tax discount rates applied to real post-tax cash flows. The discount rates are derived using the weighted average cost of capital methodology. Adjustments to the rates are made for any risks that are not reflected in the underlying cash flows, including country risk.
Closure and rehabilitation provisions |
Key estimates The recognition and measurement of closure and rehabilitation provisions requires the use of significant estimates and assumptions, including, but not limited to: •   the extent (due to legal or constructive obligations) of potential activities required for the removal of infrastructure and rehabilitation activities •   costs associated with future rehabilitation activities •   applicable discount rates •   the timing of cash flows and ultimate closure of operations The extent and cost of future rehabilitation activities may also be impacted by the potential physical impacts of climate change. In estimating the potential cost of closure activities, the Group considers factors such as long-term weather outlooks, for example forecast changes in rainfall patterns, and the impact of the Group’s energy transition strategy on the costs of performing rehabilitation activities. While progressive closure is performed across a number of operations, significant rehabilitation activities are generally undertaken at the end of the production life at the individual sites, the estimated timing of which is informed by the Group’s current assumptions relating to demand for commodities and carbon pricing, and their impact on the Group’s long-term price forecasts. Remaining production lives range from 3-91 years with an average for all sites, weighted by current closure provision, of approximately 27 years. The discount rates applied to the Group’s closure and rehabilitation provisions are determined by reference to the currency of the closure cash flows, the period over which the cash flows will be incurred and prevailing market interest rates (where available). The rates were revised during the year to reflect decreases in market interest rates. The effect of changes to discount rates was an increase of approximatively US$1,085 million in the closure and rehabilitation provision of which approximately US$210 million in respect of closed sites was recognised in the income statement. While the closure and rehabilitation provisions reflect management’s best estimates based on current knowledge and information, further studies and detailed analysis of the closure activities for individual assets will be performed as the assets near the end of their operational life and/or detailed closure plans are required to be submitted to relevant regulatory authorities. Such studies and analysis can impact the estimated costs of closure activities. Estimates can also be impacted by the emergence of new restoration techniques, changes in regulatory requirements for rehabilitation, risks relating to climate change and the transition to a low carbon economy, and experience at other operations. These uncertainties may result in future actual expenditure differing from the amounts currently provided for in the balance sheet. Sensitivity A further 0.5 per cent decrease in the discount rates applied at 30 June 2021 would result in an increase to the closure and rehabilitation provision of approximately US$1,075 million, an increase in property, plant and equipment of approximately US$820 million in relation to operating sites and an income statement charge of approximately US$255 million in respect of closed sites. In addition, the change would result in an increase of approximately US$115 million to depreciation expense and a US$25 million reduction in net finance costs for the year ending 30 June 2022. Given the long-lived nature of the majority of the Group’s assets, closure activities are generally not expected to occur for a significant period of time. A one-year acceleration in forecast cash flows of the Group’s closure and rehabilitation provisions, in isolation, would result in an increase to the provision of approximately US$230 million, an increase in property, plant and equipment of US$180 million in relation to operating sites and an income statement charge of US$50 million in respect of closed sites.
Leases |
Key judgements and estimates Judgements: Certain contractual arrangements not in the form of a lease require the Group to apply significant judgement in evaluating whether the Group controls the right to direct the use of assets and therefore whether the contract contains a lease. Management considers all facts and circumstances in determining whether the Group or the supplier has the rights to direct how, and for what purpose, the underlying assets are used in certain mining contracts and other arrangements, including outsourcing arrangements, shipping arrangements and power purchase agreements. Judgement is used to assess which decision-making rights mostly affect the benefits of use of the assets for each arrangement.
Where a contract includes the provision of non-lease services, judgement is required to identify the lease and non-lease components.
Estimates: Where the Group cannot readily determine the interest rate implicit in the lease, estimation is involved in the determination of the weighted average incremental borrowing rate to measure lease liabilities. The incremental borrowing rate reflects the rates of interest a lessee would have to pay to borrow over a similar term, with similar security, the funds necessary to obtain an asset of similar value to the right-of-use asset in a similar economic environment. Under the Group’s portfolio approach to debt management, the Group does not specifically borrow for asset purchases. Therefore, the incremental borrowing rate is estimated with reference to the Group’s corporate borrowing portfolio, adjusted to reflect the terms and conditions of the lease (including the impact of currency, credit rating of subsidiary entering into the lease and the term of the lease), at the inception of the lease arrangement or the time of lease modification.
The Group estimates stand-alone prices, where such prices are not readily observable, in order to allocate the contractual payments between lease and non-lease components.

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