Pre-Feasibility Studies And Bankable Feasibility Studies In Mining
Mining projects need technical evidence before serious capital can form a view. Drill results, grade, and commodity price exposure may attract attention, but project value is tested through mine design, metallurgy, infrastructure, permitting, operating cost, capital cost, and reserve confidence.
Pre-Feasibility Studies and Feasibility Studies sit at the centre of that process. They move a project from geological potential into an economic development case that can be reviewed by investors, lenders, offtakers, insurers, technical consultants, and boards.
What A Pre-Feasibility Study Means
A Pre-Feasibility Study, usually shortened to PFS, is a technical and economic assessment of a mining project at an intermediate level of confidence. It assesses whether the project has a credible development route and whether further technical, financial, environmental, and permitting work is justified.
A PFS typically covers the preferred mining method, processing route, production profile, metallurgical assumptions, infrastructure needs, preliminary capital cost, operating cost, royalties, taxes, environmental baseline issues, permitting pathway, and financial model.
Under the CIM Definition Standards , public disclosure of a Mineral Reserve must be demonstrated by a Pre-Feasibility Study or Feasibility Study. The JORC Code also requires the key assumptions and outcomes of the Pre-Feasibility Study or Feasibility Study to be disclosed when reporting a new or materially changed Ore Reserve.
What A Bankable Feasibility Study Means
A Bankable Feasibility Study, often called a BFS, is the market term for a Feasibility Study prepared at a higher level of technical, commercial, and cost confidence. It is also often called a Definitive Feasibility Study or DFS.
Under SEC Regulation S-K 1300 , terms such as bankable, definitive, final, and full feasibility study are treated as equivalent to a Feasibility Study. The phrase “bankable” is a commercial label. It signals that the study should be detailed enough for a financing decision, subject to independent review and transaction-specific diligence.
A BFS should define the selected development option in depth. It should include detailed mine design, process plant design, infrastructure engineering, capex estimate, operating model, execution schedule, procurement strategy, environmental and social workstreams, permitting plan, closure obligations, and sensitivity analysis.
PFS Versus BFS
| Area | Pre-Feasibility Study | Bankable Feasibility Study |
|---|---|---|
| Purpose | Tests whether the project has a credible development case. | Supports final investment decisions, financing discussions, offtake negotiations, and board approvals. |
| Reserve Conversion | Provides the minimum technical study level commonly required for Mineral Reserve or Ore Reserve reporting. | Supports higher confidence reserve, mine planning, cost, and execution assumptions. |
| Mine Design | Defines the likely mining method and initial production schedule. | Includes detailed pit, underground, geotechnical, fleet, dilution, recovery, and sequencing work. |
| Metallurgy | Uses testwork to support preliminary recovery and processing assumptions. | Uses deeper testwork to support flowsheet design, recovery curves, product quality, consumables, and plant performance assumptions. |
| Costs | Provides capital and operating cost estimates with wider contingency. | Provides a more detailed cost estimate supported by engineering, vendor input, execution planning, and procurement assumptions. |
| Environmental And Social | Identifies material environmental, social, land, water, biodiversity, and community issues. | Develops the environmental and social package required for permitting, financing review, and construction planning. |
The Role Of Modifying Factors
Mining studies are built around modifying factors. These are the practical conditions that affect whether a Mineral Resource can become an economically mineable reserve. They include mining method, metallurgical recovery, processing, infrastructure, economic assumptions, legal title, environmental approvals, social factors, government royalties, taxation, marketing, and product saleability.
Weak modifying factors can destroy an otherwise attractive grade profile. A deposit can look good geologically and still fail on power, water, logistics, metallurgical recovery, capex intensity, permitting risk, tailings management, social opposition, or export route constraints.
Why These Studies Matter For Financing
Capital providers use mining studies to size risk. A PFS may support early-stage development capital, strategic investor discussions, stream financing review, royalty discussions, or technical due diligence. A BFS can support more advanced financing discussions, including project finance, reserve-based lending, offtake prepayments, construction funding, and institutional equity.
The study package directly affects cost of capital. Better technical confidence, clearer permitting, stronger reserve conversion, credible execution planning, and lender-grade environmental and social documentation usually support better financing terms.
Environmental and social risk review is a major part of mine financing. The IFC Performance Standards provide a recognised framework for identifying and managing environmental and social risks. The Equator Principles are used by financial institutions as a benchmark for assessing and managing environmental and social risk in project-related finance.
Common Contents Of A Serious Mining Study
- Geology, deposit model, drilling database, QA/QC, sampling, and assay controls.
- Mineral Resource estimate and Mineral Reserve or Ore Reserve statement.
- Mine design, production schedule, dilution, recovery, and cut-off grade assumptions.
- Metallurgical testwork, processing route, recovery assumptions, and product specifications.
- Power, water, roads, rail, port access, camp, workshops, fuel, tailings, and waste management.
- Capital cost, operating cost, sustaining capital, working capital, closure cost, and contingency.
- Commodity price deck, royalties, taxes, exchange rates, inflation, discount rate, and sensitivity cases.
- Permitting, land access, community relations, biodiversity, resettlement, security, and closure planning.
- Execution schedule, procurement strategy, contract packaging, owner’s team plan, and construction risk.
How Investors Read The Documents
Investors rarely read a PFS or BFS as a static engineering document. They read it as a risk map. The key questions are usually simple: can the ore be mined, can it be processed, can the product be sold, can the infrastructure be built, can the permits be secured, can the community and government interfaces be managed, and can the projected margin survive downside cases.
The most useful studies make those questions easier to answer. They show the assumptions clearly, identify the remaining gaps, explain the selected development option, and give decision-makers enough evidence to assess risk rather than rely on promotion.
