Accounting for Wasting Assets Including Expenditure on Exploration and Extraction of Minerals, Oil, Natural Gas and Similar Non‑Regenerative Resources
1. Introduction
Wasting assets are natural, exhaustible resources such as minerals, crude oil, natural gas, quarries, and similar deposits whose economic usefulness declines directly with extraction. These assets differ fundamentally from ordinary fixed assets because their consumption is linked not to time but to physical depletion. Accounting for such resources involves specialised recognition, measurement, depletion, impairment, and disclosure principles. Indian guidance is based on the ICAI pronouncements, including Ind AS 106, Ind AS 16, Ind AS 36, Ind AS 37, the Guidance Note on Accounting for Oil and Gas Activities, and Schedule III. Internationally, IFRS 6, IAS 16, IAS 36 and IAS 37 govern extractive‑industry accounting. This article provides a detailed professional analysis with case studies, numerical illustrations, and financial‑statement treatment.
2. Nature and Characteristics of Wasting Assets
Wasting assets exhibit certain intrinsic characteristics:
(a) They are non‑regenerative within an economic cycle.
(b) Their consumption is measurable in physical units.
(c) The asset value diminishes proportionately with extraction.
(d) Restoration obligations arise at the end of useful extraction.
Categories include exploration and evaluation assets, development assets, producing assets and decommissioning or abandonment obligations. Reserve estimation is central to valuation and depletion; therefore, geological, engineering and economic factors influence financial reporting significantly.
3. Recognition Principles under ICAI and IFRS
3.1 Exploration and Evaluation Expenditure
Ind AS 106 and IFRS 6 permit recognition of exploration and evaluation expenditure as an asset when rights to explore exist and costs are expected to generate future economic benefits. Costs include seismic surveys, exploratory drilling, geological appraisal and related technical studies. General administrative costs are expensed unless directly attributable.
3.2 Development Expenditure
After technological feasibility and commercial viability are demonstrable, development expenditure is capitalised. These include well drilling for production, construction of platforms, shafts, tunnels, mine infrastructure, pipelines and related facilities. International practice under IAS 16 classifies these as tangible assets unless rights or licences qualify as intangibles.
3.3 Producing Assets
Once assets are ready for use, development assets are transferred to producing assets, and depletion begins. Costs incurred to maintain existing capacity are expensed, whereas enhancement or extension of reserve‑yielding capacity is capitalised.
3.4 Restoration and Abandonment Obligations
Under Ind AS 37 and IAS 37, decommissioning obligations are recognised as a provision at present value, with a corresponding asset recognised as part of the cost. The liability unwinds over time, generating accretion expense in the profit and loss account.
4. Measurement and Valuation
4.1 Initial Measurement
Initial cost comprises acquisition rights, survey and drilling expenditure, development cost, directly attributable overheads, and present value of restoration obligations. If payments are deferred, the cost equals cash price equivalent.
4.2 Subsequent Measurement
Entities may adopt the cost model or, in rare cases, a revaluation model consistent with IAS 16. Extractive industries generally follow the cost model due to absence of active markets for reserves.
4.3 Impairment
Ind AS 36 and IAS 36 require impairment testing when indicators arise, such as a decline in commodity prices, adverse geological findings, regulatory restrictions or revision of reserves. Cash‑generating units (CGUs) typically correspond to fields, mines or blocks. Recoverable amount is the higher of value‑in‑use and fair value less costs of disposal.
Example – Restoration cost valuation:
Assume restoration is expected after 20 years at ₹150 crore and the discount rate is 7 percent.
Present value = 150 / (1.07**20) ≈ ₹38.7 crore.
This amount is added to asset cost and the liability increases annually through unwinding.
5. Depletion Methods
The primary depletion basis in extractive industries is the units‑of‑production (UOP) method.
Formula:
Depletion per unit = (Cost – Residual Value) / Estimated Recoverable Reserves
Illustration:
Cost of a petroleum field including restoration asset = ₹900 crore
Estimated reserves = 90 million barrels
Current year’s production = 5 million barrels
Depletion = (900 / 90) * 5 = ₹50 crore
Revised reserve estimates require prospective adjustment. This introduces volatility in depletion rates and reported profits.
6. International Accounting Practices
6.1 Successful‑Efforts Method (SEM)
SEM capitalises only costs that lead to successful discoveries. Dry wells are expensed immediately. SEM is adopted widely by global oil majors such as ExxonMobil and Chevron.
6.2 Full‑Cost Method (FCM)
FCM capitalises all exploration and development costs in a cost centre irrespective of success. It was popular in North America. IFRS does not explicitly prohibit it but discourages inconsistent practices.
6.3 IFRS 6
IFRS 6 provides transitional relief, allowing companies to continue previous accounting policies for exploration until more comprehensive standards are developed. Impairment tests under IFRS 6 are subject to modified requirements allowing exploration assets to be grouped more broadly for impairment.
7. ICAI Guidance and Ind AS Framework
The ICAI Guidance Note on Oil and Gas Producing Activities outlines India‑specific practices:
- Pre‑survey costs and general administration expenses are charged to revenue.
- Exploration costs are capitalised only when legal rights exist.
- Dry‑hole costs are expensed immediately.
- Commercial discovery is required before development cost capitalisation.
- UOP method is mandatory for depletion.
- Abandonment cost must be provided under Ind AS 37.
- Reserve estimates, depletion methodology and impairment indicators must be disclosed.
Schedule III requires:
- Exploration and Evaluation Assets – to be shown separately under non‑current assets.
- Development Assets – under capital work‑in‑progress until ready for use.
- Producing Assets – under property, plant and equipment or intangible assets depending on nature.
8. Financial Statement Presentation
8.1 Balance Sheet
- E&E assets presented separately under non‑current assets.
- Development assets shown as CWIP.
- Producing assets classified as PPE or intangible assets.
- Restoration liability disclosed under non‑current provisions.
- Accretion of restoration obligation increases liability annually.
8.2 Profit and Loss Account
- Depletion expense charged to operating expenses.
- Impairment losses recognised under exceptional or operating items.
- Dry‑well expense charged when incurred.
- Unwinding of discount on restoration liability presented as finance cost.
8.3 Accounting Policies
A detailed policy set must include:
- Capitalisation principles.
- Reserve estimation methodology.
- Depletion method and assumptions.
- Restoration obligations.
- Impairment testing methodology.
8.4 Notes on Accounts
Disclosures include:
- Movement of each asset class.
- Movement in provisions for restoration.
- Reserve changes and impact on depletion.
- Sensitivity analysis to commodity prices and discount rates.
9. Corporate Case Studies
Case Study 1 – Illustrative: ONGC
ONGC capitalises exploration costs only after geological success is indicated. Dry wells are expensed. The company uses UOP for depletion. In a particular fiscal year, revision of reserve estimates in an offshore field reduced annual depletion by nearly 10 percent, significantly improving segmental profit.
Case Study 2 – Coal Mining Example (Coal India – Illustrative)
Mine development costs are capitalised, and stripping ratios guide expense recognition. When actual overburden removal exceeded life‑of‑mine average, prepaid stripping was recognised as an asset. Revision of stripping ratio assumptions resulted in a charge exceeding ₹800 crore in the profit and loss account.
Case Study 3 – Global Example: BHP
BHP applies SEM with rigorous impairment modelling. During a global commodity downturn, it recognised multi‑billion‑dollar impairments due to structural decline in shale‑gas price expectations. CGU identification was critical, as each basin required separate value‑in‑use modelling.
Case Study 4 – Illustrative Example: Cairn India
Cairn follows Ind AS and recognises restoration obligations at present value. Variation in reserve estimates in Rajasthan oil blocks resulted in recalculation of depletion and partial reversal of earlier impairment.
10. Comprehensive Numerical Illustration
Scenario:
A mining company acquires rights to a copper mine.
Acquisition cost: ₹400 crore
Development expenditure: ₹250 crore
Present value of restoration obligation: ₹60 crore
Total cost: ₹710 crore
Estimated reserves: 100 million tonnes
Production during the year: 6 million tonnes
(a) Depletion
Depletion = 710 / 100 * 6 = ₹42.6 crore
(b) Impairment Test
Carrying amount after depletion: 710 – 42.6 = ₹667.4 crore
Recoverable amount (value‑in‑use) = ₹650 crore
Impairment loss = ₹17.4 crore
(c) Balance Sheet Extract
Producing assets: 667.4 – 17.4 = ₹650 crore
Restoration obligation: ₹60 crore plus accretion
(d) Profit and Loss Extract
Depletion: ₹42.6 crore
Impairment: ₹17.4 crore
Finance cost (accretion): approx. ₹4.2 crore
The extractive industry requires continuous reassessment of reserves, regulatory obligations, cost structures, and technological developments. Entities must maintain robust documentation of assumptions, implement internal controls over geological data, and adopt consistent accounting policies. Variations in commodity prices affect impairment testing, while changes in reserve estimates alter depletion patterns. Government policies, production‑sharing agreements, royalty structures, and environmental requirements add further complexity. Transparent disclosures enable users of financial statements to assess risks, uncertainties and long‑term sustainability.
Author Bio
Well written article, really liked the way the exploration and production costs were explained. As a CA, the clarity on depletion methods and restoration obligations was a solid refresher.