Executive summary
This review screens whether a 60% renewable diesel–PV–BESS hybrid pathway is a more useful base case for the site than a short-life standalone option or a 100% renewable upper-bound case. It combines public-map interpretation, a preliminary siting opportunity-and-constraint screen, approval-pathway questions, microgrid boundary questions and financeability observations into a single early read.
On the public information available, scenario S4 is the case selected for hourly and commercial validation. The mapping identifies preliminary PV and BESS/PCS search areas, constraints, review areas and locations requiring owner confirmation. These are not equipment footprints or approved sites. The output is a clearer next-step pathway — not a design, financing decision or investment recommendation.
This is an independent, public-information desktop screen of a publicly documented Northern Territory gold mining project. It was not commissioned by, endorsed by or verified with the project owner, and publishing it under the owner’s name would imply a relationship that does not exist — so the asset is not named and the site-specific siting maps are not published. Everything that makes the method checkable is: the figures, their evidence grades, the open questions, and the full claim and evidence registry.
It is not formal due diligence, EPC design, a bankable feasibility study, lender due diligence, or legal, financial, tax or investment advice. All figures are indicative and must be validated against owner data before any commercial decision.
Project context
The asset is a remote, weak-grid gold-mine setting in the Northern Territory, historically dependent on diesel generation. Remote and off-grid mines typically want to reduce diesel exposure, lower operating cost and improve emissions performance — but the first question is not technical. It is whether the ownership, contract, approval and owner-saving story holds together at all.
Indicative annual demand is in the order of ~30 GWh/yr, reconstructed from public environmental-impact material. The review tests a solar PV + BESS + diesel hybrid under a third-party / Energy-as-a-Service style structure, across a range of renewable shares.
F1–F4 readiness overview
Approval
Existing public approvals provide context, but the approval delta for energy infrastructure, disturbance, fire, heritage, biodiversity and closure requires specialist confirmation.
Site
Public mapping identifies preliminary opportunities, strong constraints and review areas. It does not select a site or confirm buildable land.
Microgrid
The PV, BESS, diesel, PCS, EMS, switchboard and metering boundary remains subject to owner SLD, load and operating data.
Financeability
S4 is selected for further validation under screening assumptions. Debt capacity, residual value and owner economics are not lender or transaction conclusions.
Key findings
- S4 is the scenario selected for further validation — not a final design or investment recommendation.
- The siting output is a desktop search-area screen. It separates preliminary opportunities, strong constraints, review-required areas and owner-confirmation areas; it does not identify approved buildable land.
- More renewable was not automatically better in the screening model. The 100% annual-renewable target is a capital-heavy upper bound that requires hourly reliability and equipment validation.
- A modelled 1.30x DSCR constraint is not lender approval. Debt was resized in each scenario to that simplified constraint.
- Further work is required before any decision — owner data room, hourly dispatch modelling, EPC pricing and specialist due diligence.
Spatial evidence
F2 site suitability was worked in two stages. First, public-source layers were digitised from environmental-assessment material to establish the evidence context — what the record shows about watercourses, disturbance areas, existing infrastructure, closure areas and access. Second, that context was interpreted into a screen separating preliminary opportunities, strong constraints, review-required areas and areas needing owner confirmation.
The detailed outputs of that second stage — candidate PV and BESS search polygons over a specific third-party site — are not published here. Publishing candidate siting areas for a named asset reads as unsolicited site selection and implies an owner relationship that does not exist. The spatial method is described above and on the methodology page; the detailed site-specific work belongs in commissioned analysis, not on a public brochure.
Context, constraint and question
- What the public record shows about the site and its surrounds
- Which constraints are visible before anyone visits
- Roughly where equipment could and could not sit
- Which questions only the owner can answer
Anything that decides a site
- Approved buildable land
- Land access or tenure confirmation
- Equipment footprints or a chosen site
- Geotechnical, flood or heritage clearance
Public information sources
This desktop review is built only from public and indicative information, including:
- NT EPA environmental impact assessment register — the public register through which this project’s assessment documents were published.
- Draft Environmental Impact Statement, main report (May 2021), section 3.8.1.1 and Table 3.19, and the accompanying GHG assessment — indicative annual electricity demand, peak load and diesel consumption. Direct link withheld: it names the asset.
- Proponent public reporting — disclosed PV and BESS starting points. Primary disclosure URL never captured; marked unresolved in the evidence registry.
- Global Solar Atlas — regional solar-yield assumptions.
- Analyst assumptions — diesel price, genset O&M, EPC benchmarks, gearing and tenor.
Two references above are not linked, for different reasons. One is withheld — the document is public and we hold it, but the link names the asset, so the document class, date and section are given instead and the reference is available on request. One is unresolved — we never captured the primary URL, which is a gap in our own record rather than a decision. The evidence registry marks each as such rather than quietly dropping either.
Linked sources support the public project context and selected starting inputs. Scenario sizing, preliminary search areas, diesel price, EPC benchmarks, gearing, tenor, DSCR and owner-outcome calculations are Heliovulcan screening assumptions. They have not been confirmed by the project owner, an EPC contractor or a lender.
Key risks and open questions
- Approval delta (F1): whether the project fits the existing approval pathway, or triggers new issues around disturbance, MMP / licence variation, water, fire, heritage, biodiversity, closure or ownership chain.
- Site suitability (F2): usable area, setbacks, watercourses, roads, pipelines and closure areas constraining where PV, BESS, PCS and interconnection can realistically sit.
- Microgrid boundary (F3): how PV, BESS, diesel, PCS, EMS and mine loads connect, and the SLD, switchboard, metering and load data required before reliability can be assessed.
- Financeability (F4): mine-life and contract tenor risk, residual buy-out, debt sizing and whether the contracted structure can support debt service.
Open questions
- Which land, access and disturbance areas can the owner make available for energy infrastructure?
- What hourly load, diesel dispatch and reliability criteria must the hybrid system meet?
- Which party owns and operates the PV, BESS, diesel plant, connection assets and control system?
- What contract tenor, payment floor, residual treatment and credit support could support finance?
Recommended next steps
- Open an owner data room — confirmed mine plan, load and diesel data.
- Run hourly dispatch modelling to validate the renewable share and reliability.
- Define scenario-specific PV, BESS, diesel, fuel-use and dispatch schedules, then obtain indicative EPC pricing for the configuration selected for validation.
- Commission specialist due diligence (technical, approvals, legal, commercial).
- Develop the commercial structure and a CP / financial-close pathway.
Reports
Two PDF reports sit behind this screen — an integrated F1–F4 development and financeability review, and a financeability deep dive on owner, SPV and lender economics. They name the asset, so they are no longer offered as public downloads. They are available on request, and the substance is published on this page and in the claim and evidence registry either way.
Maps and full reports
Siting opportunity and constraint screen
Interactive map. Candidate search areas against tenement, watercourse, road, pipeline and disturbance constraints.
Regional context map
Interactive map. Grid position, transport corridors and surrounding land use.
This screen was built entirely from public records. The project owner was not involved in it, has not reviewed it and has not endorsed it. Nothing here implies any relationship with, or engagement by, the owner or any other party. Search areas shown on the maps are Heliovulcan-derived from public spatial data — they are not proposals, and no landholder, tenement holder or regulator has agreed to them. The linked reports name the publicly documented project they were prepared from. Nothing on this page is investment, engineering or legal advice.
Data and machine access
The structured record behind this case — every core claim with its type, confidence and evidence — is published on the Remote Mining Asset project entity page and as read-only JSON: project · claims · evidence · API documentation · OpenAPI specification · methodology.