The Cooper Basin (Ratification) Act 1975 approves and gives statutory force to a detailed commercial agreement (the Indenture, set out in the Schedule) between the State of South Australia and named petroleum companies (the Producers). (s6; Schedule—The Indenture)
It compels the State and its Minister to take the steps needed to give effect to that Indenture (s6(2); Indenture cl2(1)).
The Act changes how a number of existing laws operate in relation to the Indenture and the arrangements it creates: it treats certain buildings/plant as chattels rather than fixtures (s8; Indenture cl4(2)); authorises special petroleum production licences and sub-licences in a particular form (s9; Indenture cl6); prevents certain rates, taxes and duties being charged where they would contradict the Indenture (s13; s14; Indenture cl7; Indenture cl9); treats areas as contiguous for petroleum licensing purposes (s10; Indenture cl6(5)); and excludes particular arbitration and other statutory provisions from applying to specified agreements (s19; Indenture cl19).
It establishes a bespoke royalty regime for petroleum covered by the Indenture for a defined period (the Royalty Term 1 Jan 1991–31 Dec 2000) and detailed rules for calculating, reporting, auditing and reconciling those royalties (Indenture cl12). After the Royalty Term royalty returns to being governed by the Petroleum Act (Indenture cl12(5)(b)).
The Act also seeks to ensure the Commonwealth (and its agencies) can be treated as parties and subject to the same licensing framework where they become parties to the Indenture (s4).
The Cooper Basin (Ratification) Act 1975 ratifies and gives legislative force to a comprehensive Indenture dated 16 October 1975 between the State of South Australia, the Minister of Mines and Energy, and ten petroleum producers (Santos Ltd, Delhi International Oil Corporation, Alliance Petroleum Australia NL, Basin Oil NL, Bridge Oil NL, Pursuit Oil NL, Reef Oil NL, Vamgas NL, and others). The Indenture's recitals emphasise the importance of the Producers' operations for the State's energy needs, petrochemical feedstock, and petroleum resource development, with the explicit goal of rationalising operations to optimise recovery of reserves (Indenture preamble).
At its core, the Act approves the Indenture (s 6(1)), authorises the Premier, Minister, and Government to implement it (s 6(2)), and then overlays a series of statutory modifications to existing law to ensure the Indenture operates as intended. These include:
Power for the Governor to grant fee simple estates and easements over specified Moomba land free of encumbrances (s 7, implementing Indenture cl 4(1)).
Deeming buildings, structures, plant, and equipment on that land to be chattels rather than fixtures, notwithstanding any contrary law (s 8, giving effect to Indenture cl 4(2)).
Authorisation for the Minister to grant petroleum production licences in a form tied to the Unit Agreement (Appendix B to the Indenture) and to approve sub-licences, overriding standard Petroleum Act 1940 processes in certain respects (s 9). However, post-27 February 1999 applications are barred from using this mechanism (s 9(2)(b)), reflecting the 2003 amendments.
Treatment of licensed areas as contiguous for the purposes of Petroleum Act 1940 s 36 (s 10).
Additional ministerial powers and licensee rights to construct pipelines, pumping stations, tanks, and roads outside licensed areas where necessary for Unit Agreement operations (ss 11–12).
Current sections
Direct links to the current provisions in Cooper Basin (Ratification) Act 1975.
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The Governor and Minister receive broad powers to make regulations or grant approvals necessary to implement the Indenture; the Governor may for this purpose dispense with, suspend or vary other statutory provisions if they impede implementation (s22).
Who it affects
The Producers named in the Indenture and their successors/assignees (Schedule—The Indenture). The Indenture and the Act together create rights, obligations and licences that apply to those producers and to persons who derive interests from them (s3 definitions; Indenture cl1(3), cl14).
The State of South Australia and its agencies: the Act binds the State to grant land, easements, licences and certain tax/tariff concessions (s6(2); s7; Indenture cl4; Indenture cl7; Indenture cl9; Indenture cl13).
Buyers of gas, liquids and petrochemical feedstock who deal with the Producers under the Sales Contracts identified in the Indenture (Indenture cl1(7)).
Potentially the Commonwealth and its agencies if they become parties to the Indenture (s4).
Why it matters (claimed purpose, and how the law achieves it)
The Indenture’s preamble records that the parties agreed the arrangements would rationalise operations and optimise recovery of petroleum reserves and support supply of feedstock for petrochemical development (Indenture "WHEREAS"). The Act gives those private agreements statutory backing and creates a bespoke regulatory framework to implement them (s6; Indenture cl2).
Mechanisms used to achieve that claimed purpose include: statutory ratification of the Indenture (s6); detailed, binding provisions on licences, infrastructure use and construction (s9; s12; Indenture cl6, cl7); a customised royalty regime with specific deductible items and accounting/audit procedures (Indenture cl12); tax and stamp duty exemptions and limitations on rates/levies inconsistent with the Indenture (s13; s14; Indenture cl7; Indenture cl9); statutory recognition or authorisation under the Trade Practices Act for the authorised agreements and related conduct (s16; Indenture cl10); and powers for the State to vest land and treat improvements as chattels to facilitate transfer, security and operational control (s7; s8; Indenture cl4(1)-(2)).
Testing the claimed purpose against costs, incentives and trade-offs (source‑based)
Certainty for producers vs. reduced State revenue: The Act locks in a bespoke royalty calculation for a defined period (Indenture cl12). It also exempts specified instruments from stamp duty and limits the application of rates/taxes inconsistent with the Indenture (s13; s14; Indenture cl9). Those are concrete foregone revenues or constrained taxing powers for the State in order to provide contractual certainty to Producers.
Concentrated benefits for named producers: The rights, concessions and exemptions target specific parties listed in the Indenture (Schedule). The Act thus creates firm, enforceable advantages for those parties (e.g. licence form, tax/stamp exemptions, authorisation under the Trade Practices Act) rather than a general industry regime (s3 definitions; s6; s14; s16; Indenture cl6, Indenture cl9).
Effects on competition and contract freedom: The Act expressly validates the authorised agreements and associated conduct for Trade Practices Act purposes (s16; Indenture cl10). That validation permits certain coordinated arrangements among the Producers (for example, arrangements related to sale/delivery of liquids and pipeline conditions) to stand without being challenged under section 51 of the Trade Practices Act in the manner otherwise possible. The Act requires notice to the Minister for some post‑commencement agreements and gives the Minister 60 days to exclude them from that authorisation on public interest grounds (s16(1)(e)(i)-(ii)).
Property and financing implications: The law allows the State to grant fee simple land and easements and treats on‑site plant and improvements as chattels (s7; s8; Indenture cl4(1)-(2)). That changes how those assets can be transferred, mortgaged or charged (Indenture cl14), creating clearer collateralisation paths for producers and affecting how lenders and purchasers deal with those assets.
Administrative discretion and uncertainty: Several material items are left to Ministerial or gubernatorial decision—approval of minor amendments and certain agreements (s3 definitions; s5), ministerial determinations of deductions and apportionments where parties do not agree (Indenture cl12(2)(c); cl12(2)(d); cl12(2)(e); cl12(2)(d)(ii); cl12(2)(d) and cl12(2)(d) apportionment processes), the Minister’s power to recalculate royalties within specified windows (Indenture cl12(4)(i)), and the Governor’s power to make regulations dispensing with other laws where they impede the Indenture (s22). Those delegated powers reduce immediate legal predictability in some technical areas while retaining parliamentary primacy for amendments that would alter the Indenture materially (s5; Indenture cl15).
Compliance burden on Producers: The Indenture imposes ongoing reporting and audit obligations — monthly royalty notices and payments, six‑monthly estimates, annual reconciliations, auditor reports and production of books and records on request (Indenture cl12(4)(a)-(m), (h), (k)). Interest applies to late payments (Indenture cl12(4)(m)). These are concrete administrative and financial compliance costs borne by Producers.
Flexibility to amend vs. parliamentary oversight: The Indenture may be varied by agreement, but any variation does not take effect until ratified by Parliament (s5; Indenture cl15). That reduces commercial agility in exchange for legislative-level certainty.
Who pays, who decides, and what behaviour changes
Who pays: the Producers pay royalties calculated under the Indenture during the Royalty Term and are subject to licence rents, potential charges for licence-related activity, and costs of operating, constructing and maintaining facilities (Indenture cl12; Indenture cl7; Indenture cl6(7)). The State forgoes certain taxes and stamp duties and takes on obligations to grant land/easements and to maintain or upgrade specified public infrastructure (s7; s13; s14; Indenture cl4; Indenture cl5; Indenture cl7; Indenture cl13). Lenders or purchasers interacting with producers face the statutory treatment of plant as chattels and the prohibition on partition (s8; Indenture cl11; Indenture cl14).
Who decides: the Minister and the Governor have central roles—approving licences and agreements, making determinations on deductions, recalcitrant apportionments, auditing and requiring production of records (s9; s16; s22; Indenture cl12(2)-(4)). The Governor can make regulations to vary other laws for implementation (s22). Parliament must ratify any agreement that purports to amend the Indenture (s5; Indenture cl15).
What behaviour changes: The Act encourages the Producers to operate as a unitised, coordinated group under the Unit Agreement and related authorised agreements (Indenture cl1, cl6, cl10). It gives them statutory rights to construct and operate downstream facilities and pipelines, to treat field infrastructure as movable property for transfer/finance, and creates a predictable royalty and tax framework for the Royalty Term — all of which are incentives to invest in production, downstream processing and related infrastructure (s12; s8; Indenture cl6; Indenture cl12; Indenture cl13).
Implementation and risk notes (source‑based)
The Act centralises significant discretion in the Minister (royalty determinations, approvals and exclusions) and in the Governor (regulation‑making that can override other laws where they impede the Indenture) (s16; s22; Indenture cl12(2)(c)-(d)).
Amending commercial terms requires an Act of Parliament (s5; Indenture cl15), which reduces speed and flexibility for commercial parties but increases legislative certainty for the arrangements as a whole.
Voiding of any rates, taxes, or charges that contravene Indenture cl 7 non-discrimination and unimproved value rules (s 13).
Stamp duty exemptions for a long list of instruments including the Indenture itself, the Unit Agreement, cross-charges, certain assignments to related companies, and initial land instruments (s 14, implementing Indenture cl 9).
Permission for remote supervisory control of wells and facilities, excluding the Boilers and Pressure Vessels Act 1968 s 34 (s 15, implementing Indenture cl 8).
Specific authorisation of all "authorised agreements" (defined in s 3(1) to include the Indenture, Liquids Agreement, AGL Letter of Agreement, Fixed Factor Settlement Agreement, Right of Way Agreement, Unit Agreement, Downstream Agreement, Pipeline Licence No 2, and Liquids Sales Contracts) and related acts for the purposes of Commonwealth Trade Practices Act 1974 s 51, with a post-commencement public interest veto mechanism exercisable by the Minister within 60 days (s 16, as substituted by the 2003 Amendment Act).
Prevention of partition or court-ordered sale of jointly held licences, titles, or property under the Unit Agreement or Joint Operating Agreements (s 17, implementing Indenture cl 11).
A bespoke royalty regime (s 18 and Indenture cl 12) that, for the "Royalty Term" of 1 January 1991 to 31 December 2000, substitutes a 10% wellhead value calculation with extensive allowable deductions (straight-line depreciation of an $800 million deemed capital base, post-1991 capital expenditure with interest at half the 10-year Australian Government Bond Rate, operating costs, leasing costs subject to CPI-indexed caps, rehabilitation expenditure, and tolling adjustments). After 31 December 2000, royalties revert to the Petroleum Act 1940 (Indenture cl 12(5)(b)). The clause contains minute accounting rules for gross sales value, take-or-pay payments, apportionment of shared plant, audit requirements, reconciliations every six months, Minister recalculation powers, and interest on late payments at 2% above the Bond Rate.
Exclusion of Arbitration Act 1891 s 24A from disputes under the Indenture, Unit Agreement, Sales Contracts, Exploration Indenture, and P.A.S.A. Future Requirements Agreement (s 19).
Application of the Act to land under the Real Property Act 1886 notwithstanding that statute (s 20).
Preservation of other laws except where expressly or by necessary implication overridden (s 21).
Regulation-making power, including power to dispense with, suspend, or vary any other Act or regulation that would impede the Indenture (s 22(2)).
The Schedule reproduces the full Indenture, which itself contains 21 clauses plus definitions, appendices, and execution clauses. Clause 1 defines critical terms such as "Petroleum Production Licence", "Sales Contracts" (including gas sales to PASA, liquid hydrocarbon contracts, and arms-length sales), "Subject Area", "Unitized Substances", and "Authorised Agreement". Clause 2 required parliamentary ratification by 31 December 1975 (or agreed later date), with termination rights if the State later passes modifying legislation without rectification within six months. Clause 3 sets conditions precedent including financing arrangements and execution of the Unit Agreement, Gas Sales Contract, Exploration Indenture, and P.A.S.A. Future Requirements Agreement. Clause 6 mandates grant of licences in the form of Appendix B and protects renewal rights. Clause 10 commits the State to best endeavours to maintain Trade Practices Act authorisation. Clause 14 restricts assignments except in accordance with the Unit Agreement and Petroleum Act s 42. Clause 15 requires any variation of the Indenture to be ratified by Parliament. Force majeure, notices, governing law (South Australia), arbitration carve-outs, several (not joint) liability of Producers, and environmental compliance round out the Indenture.
In essence, the Act creates a tailored statutory overlay that stabilises the fiscal, tenure, and operational environment for what became one of Australia's most significant onshore petroleum provinces, while embedding ministerial oversight and parliamentary control over future changes.
Who it affects
The primary parties affected are the "Producers" (originally Santos Ltd, Delhi International Oil Corporation, Alliance Petroleum Australia NL, Basin Oil NL, Bridge Oil NL, Pursuit Oil NL, Reef Oil NL, Vamgas NL, and their successors, assigns, and agents—see s 3(1) definition of "party" and Indenture cl 1). Through subsequent corporate changes and the inclusion of additional entities via the Liquids Agreement, Fixed Factor Settlement Agreement, and Downstream Agreement, the net has widened to include companies such as Bridge Oil Developments Pty Ltd, Crusader Resources NL, Delhi Petroleum Pty Ltd, Santos Petroleum Pty Ltd, Boral Energy Resources Ltd, Santos (BOL) Pty Ltd, Reef Oil Pty Ltd, South Australian Oil and Gas Corporation Pty Ltd, Total Exploration Australia Pty Ltd, and Vamgas Ltd.
The State of South Australia is directly bound through the obligations placed on the Governor, Premier, Minister for Mines and Energy (now the Minister administering the Petroleum Act), and any agency or instrumentality. Section 4 expressly extends the Act, so far as constitutionally possible, to the Commonwealth and its agencies if they become parties to the Indenture, and modifies the Petroleum Act 1940 to treat the Commonwealth as a "person" for licensing and execution purposes.
Downstream purchasers are indirectly affected, particularly the Pipelines Authority of South Australia (PASA) under historical gas sales contracts, and any buyers of liquids or petrochemical feedstock. The Act's Trade Practices authorisation (s 16) shields contracts for sale or delivery of liquids from competition law challenge, provided the Minister is notified of post-commencement arrangements and does not veto them on public interest grounds within 60 days.
Local government authorities and rating bodies are affected by the prohibition on discriminatory rates or taxes and the requirement to levy only on unimproved value of the Moomba land (s 13 and Indenture cl 7). The Commissioner of Highways has specific obligations and cost-recovery rights regarding the Strzelecki Track and pipeline crossings (Indenture cl 5).
Ultimately, South Australian energy consumers, the petrochemical industry, and the broader public benefit from (or bear the consequences of) the stable supply and royalty revenue streams the Act underpins. Environmental regulators retain oversight because Indenture cl 21 expressly requires compliance with State environmental laws notwithstanding other provisions.
Key duties and rights
Producers' rights include:
Statutory entitlement to petroleum production licences in the special Appendix B form and sub-licences to implement the Unit Agreement (s 9(1), Indenture cl 6(1)).
Extended rights under Petroleum Act 1940 s 33 to construct facilities outside licensed areas for Unit Agreement purposes (s 12).
Remote operation of wells and facilities (s 15).
Protection against partition of jointly held assets (s 17, Indenture cl 11).
Specific royalty calculation method during the Royalty Term, including deduction of an $800 million capital base, post-1991 capex with interest, opex, leasing (subject to $4m CPI-indexed annual cap without approval), rehabilitation, and tolling credits (Indenture cl 12(2)–(3)).
Assignment rights subject only to Petroleum Act s 42 and Unit Agreement (Indenture cl 14).
Force majeure extensions for non-monetary obligations (Indenture cl 16).
Several (not joint) liability for royalties, with the Minister not required to inquire into inter-producer apportionment (Indenture cl 12(4)(f)–(g)).
Producers' duties include:
Compliance with environmental laws (Indenture cl 21).
Payment of royalties with monthly notifications, six-monthly estimates, annual reconciliations, audits by a registered auditor, and production of records on request (Indenture cl 12(4)).
Notification to the Minister of Unit Agreement amendments (Indenture cl 6(9)) and of post-commencement sales contracts for liquids (s 16(e)).
Payment of full costs for Strzelecki Track upgrades and restoration when using heavy vehicles (Indenture cl 5(5)).
Execution of the Unit Agreement, Gas Sales Contract, Exploration Indenture, and P.A.S.A. Future Requirements Agreement as conditions precedent (Indenture cl 3).
Best endeavours to overcome force majeure events (Indenture cl 16(2)).
State/Minister rights and duties:
Obligation to grant or procure grants of land, easements, licences, and approvals (ss 7, 9; Indenture cls 4, 6, 13).
Power to approve or veto new liquids sales arrangements on public interest grounds (s 16(e)).
Power to recalculate royalty returns, require forecasts, delegate powers, and recover interest on late royalties (Indenture cl 12(4)(i)–(m), (5)(d)).
Duty to maintain non-discriminatory tax treatment and to use best endeavours to preserve Trade Practices Act authorisation (Indenture cls 7, 10).
Regulation-making power to override other laws if they impede the Indenture (s 22(2)).
Right to terminate rights if the Producers breach licence conditions, with notice to sub-licensees, mortgagees, and chargees, and an obligation to offer new licences to non-defaulting parties (Indenture cl 6(6)).
The Act expressly states that, except as provided, other Acts and laws remain unaffected (s 21), preserving the underlying operation of the Petroleum Act 1940, Real Property Act 1886, and competition legislation except to the extent of the specific carve-outs.
Penalties and enforcement
The Act itself contains no standalone offence or penalty provisions. Enforcement occurs primarily through the incorporated mechanisms of the Petroleum Act 1940 and the Indenture. Breach of a petroleum production licence condition can lead to suspension or cancellation under Petroleum Act s 87a, but the Act modifies this by requiring notice to sub-licensees, assignees, mortgagees, and chargees whose interests have been notified to the Minister (Indenture cl 6(6)(a)). If cancellation occurs, the Minister must offer a new licence on identical terms to non-defaulting licensees or, if all are in default, to non-defaulting sub-licensees (Indenture cl 6(6)(b)). Royalty underpayments trigger daily interest at Bond Rate plus 2% (Indenture cl 12(4)(m)), Minister recalculation powers (with the Minister's figure presumed correct unless the contrary is proved in court—cl 12(4)(i)), and audit rights. The Minister may demand production of books and records (cl 12(4)(k)).
Disputes under the Indenture, Unit Agreement, or Sales Contracts are subject to arbitration without the restrictions of Arbitration Act 1891 s 24A (s 19). Variation of the Indenture requires fresh parliamentary ratification (s 5(1) and Indenture cl 15); unilateral State legislation increasing obligations gives the Producers a six-month rectification window before termination rights arise (Indenture cl 2(4)).
Stamp duty exemptions are self-executing (s 14) but could be challenged by the Commissioner of State Taxation. Rates or taxes levied contrary to s 13 are declared void. Trade Practices Act authorisation under s 16 is not absolute; the Minister retains a 60-day public interest veto for new liquids contracts, breach of which could expose parties to Australian Competition and Consumer Commission action.
Environmental non-compliance is not shielded (Indenture cl 21), exposing Producers to whatever penalties the relevant environmental statutes impose. The regulation power in s 22(2) allows the Governor to create offences by varying other Acts, but this has not been used to create new penalties in the provided text.
How it interacts with other laws
The Act is a classic example of specific legislation modifying general statutes. It repeatedly uses "notwithstanding any Act or law to the contrary" language (ss 7, 8, 13, 17, 18, 20). Key interactions:
Petroleum Act 1940: Heavily modified. Sections 6, 27, 28, 33, 36, 41, and 87a are supplemented or overridden for licences granted under this Act (ss 4, 9–12). The definition of "person" is expanded to include the Commonwealth (s 4(4)). Royalty provisions are substituted during the Royalty Term (s 18). Contiguous area rules are extended (s 10).
Trade Practices Act 1974 (Cth) (now Competition and Consumer Act 2010 Sch 1): Section 51 authorisation is given to all authorised agreements and acts done under them, plus liquids sales contracts notified to the Minister and not vetoed (s 16). The State undertook best endeavours to maintain this (Indenture cl 10).
Stamp Duties Act 1923: Blanket exemption for listed instruments, deemed always to have applied (s 14).
Real Property Act 1886: The Act applies to Torrens land notwithstanding that statute (s 20); buildings and plant are deemed chattels (s 8).
Arbitration Act 1891: Section 24A is disapplied to specified agreements (s 19).
Boilers and Pressure Vessels Act 1968: Excluded for remote supervisory control (s 15).
Road Traffic Act 1961 and highways legislation: Specific obligations on the Commissioner of Highways regarding the Strzelecki Track (Indenture cl 5).
A New Tax System (Goods and Services Tax) Act 1999 (Cth): Inserted into Indenture definitions (cl 1(1A)–(1C)) by the 2003 Amendment Act; GST components are ignored in royalty calculations (cl 12(5)(f)).
Law of Property Act 1936: Partition and sale remedies are excluded for Unit Agreement property (s 17, Indenture cl 11).
Section 21 acts as a savings clause: nothing in the Act affects other laws except by express provision or necessary implication. The regulation power in s 22(2) is a Henry VIII clause allowing the Governor to suspend or vary any other law by regulation if it impedes the Indenture.
Recent changes and why
The legislative history reveals three main amending Acts. The Stony Point (Liquids Project) Ratification Act 1981 expanded the definition of authorised agreements to include the Liquids Agreement, Pipeline Licence No 2, Liquids Sales Contracts, and Right of Way Agreement, inserted new definitions, amended cl 1(7) of the Indenture to broaden "Sales Contracts", and updated multiple clauses to accommodate liquids production and infrastructure. This was driven by the desire to develop a petrochemical industry using Cooper Basin liquids.
The Cooper Basin (Ratification) (Royalty) Amendment Act 1991 substituted a completely new cl 12 into the Indenture, introducing the 10% Royalty Term regime with the $800 million capital write-off, detailed deduction categories, reconciliation, audit, and Minister determination mechanisms. It also amended s 10 and cl 6(5). The change was motivated by the need to provide fiscal certainty to encourage further investment while protecting State revenue through a transparent, auditable formula that replaced the previous Petroleum Act royalty.
The Cooper Basin (Ratification) Amendment Act 2003 was the most substantial textual update. It substituted the s 3 interpretation provision to modernise the list of authorised agreements with recursive amendment rules (pre-2003 amendments, those ratified by Act, or Minister-approved minor ones). It inserted s 9(2) to close the special licensing pathway after 27 February 1999 (while preserving renewals), substituted s 16 to refine the Trade Practices authorisation (adding explicit coverage of Pipeline Licence No 2 conditions and pre-commencement acts), updated Indenture definitions (adding GST terms, substituting the Unit Agreement definition, inserting "Authorised Agreement"), amended cl 10 to reflect the new authorisation language, and made minor adjustments to cl 12(5). These changes aligned the Act with contemporary competition policy, tax law (GST), and administrative practice while preserving the core 1975 bargain. The staggered commencement (most provisions 15 December 2003, GST and cl 10 changes backdated to 1 July 2000) reflects Commonwealth-State tax reform coordination.
No further amendments appear in the provided history, indicating the regime has achieved legislative stability.
Court challenges and controversies
The source text contains no references to specific court decisions, and the instructions prohibit invention of cases. However, the structure of the Act itself anticipates disputes in several areas. The Minister's power to determine royalty calculations where agreement is not reached (cl 12(2)(c), (4)(i), (4)(j)) carries an implicit reasonableness obligation (cl 12(5)(e)), which could ground judicial review. The presumption that the Minister's recalculation is correct unless the contrary is proved (cl 12(4)(i)) reverses the ordinary onus and would likely be tested in any Supreme Court action for recovery of additional royalty.
The public interest veto in s 16(e)(ii) for new liquids contracts is framed as an administrative decision; its exercise or non-exercise could be challenged on administrative law grounds. The validity of the Henry VIII regulation power in s 22(2) has not been tested in the text but would raise classic separation-of-powers questions if used to suspend primary legislation.
The Trade Practices authorisation in s 16 has been controversial in principle because it carves major gas and liquids marketing arrangements out of competition law. The 2003 substitution broadened the authorisation while adding a ministerial oversight mechanism, presumably to address concerns about open-ended immunity.
Termination rights under Indenture cl 2(4) if the State legislates to increase obligations have never been exercised on the face of the text, but the six-month rectification window creates a structured negotiation period that avoids immediate litigation. The several liability for royalties (cl 12(4)(g)) prevents the State from pursuing all Producers jointly for one party's shortfall, a deliberate drafting choice that could lead to inter-producer contribution disputes outside the Minister's concern.
Environmental compliance (cl 21) has been a live issue in the Cooper Basin generally, but the Act does not shield Producers and therefore channels any controversy into the general environmental enforcement regime rather than creating a special statutory cause of action.
Gotchas
Most practitioners assume the royalty regime froze in 1975; in fact, the entire cl 12 was replaced in 1991 and the Royalty Term expired on 31 December 2000, after which Petroleum Act 1940 royalties apply (cl 12(5)(b)). The $800 million capital base and interest calculations are now historical artefacts, but the reconciliation and audit obligations continue to affect legacy accounting.
The definition of "authorised agreement" in s 3(1) is recursive and time-limited: only amendments made before the 2003 Amendment Act, ratified by Parliament, or approved by the Minister as "of only minor significance" qualify. Any material post-2003 variation not fitting these categories falls outside the Trade Practices authorisation and stamp duty exemptions—an easy trap when reviewing historic joint venture documents.
Section 9(2)(b) quietly closed the special licensing pathway after 27 February 1999. Many assume the Act continues to authorise new licences in the Appendix B form; it does not, although existing licences and their renewals remain protected. This interacts with the contiguous area deeming in s 10, which still applies to licences granted under the Act.
The Minister's 60-day veto window in s 16(e) is not a mere formality. Failure to notify a new liquids contract in writing, or proceeding after a veto, removes the statutory authorisation and re-exposes the arrangement to competition law. Conversely, the Minister must act within 60 days or the protection is automatic.
The chattel deeming in s 8 applies "to the extent and only to the extent necessary" to give effect to Indenture cl 4(2). In insolvency or stamp duty disputes, courts may read this narrowly, potentially leaving some fixtures outside the protection. Similarly, the no-partition rule in s 17 is limited to property "to the extent necessary to give effect to the expressed intent of clause 11 of the Indenture".
The regulation power in s 22(2) is extraordinarily broad, allowing the Governor to vary any Act by regulation if, in the Governor's opinion, it impedes the Indenture. While never exercised in the provided history, its existence means due diligence on the Cooper Basin must include a search of the South Australian Government Gazette for any such regulations.
Finally, GST components must be ignored in all royalty calculations (cl 12(5)(f)), but the definition of "GST law" was inserted only in 2003 with backdated effect to 1 July 2000. Transactions between those dates may require retrospective adjustment, creating hidden exposure in legacy royalty audits.
How to comply
Compliance begins with maintaining an up-to-date "authorised agreement" register. Every amendment to the Indenture, Unit Agreement, Liquids Agreement, or any Sales Contract must be checked against the three limbs of the s 3(1) definition: pre-15 December 2003, ratified by Act, or Minister-approved as minor. Written records of Minister approvals should be retained indefinitely.
Royalty compliance (even post-Royalty Term for legacy audits) requires monthly operator calculations, six-monthly estimates, annual reconciliations within 30 days of 30 June, and audit by a registered Australian auditor within three months of Minister receipt of the reconciliation (Indenture cl 12(4)(a)–(h)). Books and records, including computer records, must be available for Minister inspection on request (cl 12(4)(k)). Any non-arms-length expenditure requires prior written Minister approval to be deductible. Tolling revenue and shared-plant apportionment must be calculated using an agreed or Minister-approved basis.
For new liquids sales contracts after the 2003 amendments, written notice must be given to the Minister before or immediately upon execution. The 60-day clock starts on receipt; parties should diarise and not implement arrangements that could be vetoed if the public interest test is engaged.
Licence applications after 27 February 1999 cannot rely on s 9; standard Petroleum Act 1940 ss 27 and 28 criteria apply. Existing licences granted under the Act retain their special form, renewal rights, and contiguous-area status.
Assignments of interests must comply with both the Unit Agreement Article XV and Petroleum Act 1940 s 42. Mortgagees and chargees should ensure their details are notified in writing to the Minister to receive breach notices under cl 6(6).
Environmental compliance cannot be assumed from the Act; all operations must satisfy the general South Australian environmental regime (Indenture cl 21). Land at Moomba must remain zoned for petroleum use and outside water districts (Indenture cl 4(3)–(4)).
Variations to the Indenture itself require a new ratifying Act (s 5 and Indenture cl 15); commercial teams should avoid signing side letters that could be characterised as amendments without first securing parliamentary ratification.
Annual compliance certificates should confirm: (1) no unapproved post-2003 material amendments; (2) royalty returns and audits are current; (3) all new sales contracts were notified; (4) environmental approvals are in place; and (5) no discriminatory rates or taxes have been levied on the Moomba land. Records of heavy-vehicle notifications to the Commissioner of Highways and associated cost reimbursements should be retained.
In practice, operators appoint a single "Operator" under the Unit Agreement to handle all Minister notifications, reconciliations, and audits. That entity must have robust internal controls around the complex cl 12 deductions, particularly the apportionment of shared plant, interest calculations using the precise Bond Rate formula, and the treatment of take-or-pay receipts. Legal sign-off on each royalty return is advisable given the Minister's recalculation power and reversed onus.
By treating the Act and the Schedule Indenture as a single integrated code rather than background context, compliance professionals can avoid the common error of assuming standard Petroleum Act rules apply unmodified. Regular training for joint venture accountants on the royalty mechanics, and for commercial lawyers on the authorisation and amendment rules, is essential to protect the statutory immunities that make the Cooper Basin project viable.