A mining project lifecycle involves complex assessments to reduce uncertainties and financial risks associated with the project development process. Among other assessments, there are two stages that play an important role in making a final decision to invest into a mineral resource: Pre-Feasibility Study (PFS) and Feasibility Study (FS). Generally speaking, a PFS can be defined as an intermediate-stage evaluation that helps understand economic aspects and choose the best approach for extraction and processing. On the contrary, an FS is considered a complete and detailed plan that eliminates many uncertainties to attract investments.
The main purpose of a Pre-Feasibility Study is to work as a filter tool. At this stage, developers explore many possible project scenarios such as using various levels of production, different methods for extraction and metallurgical process. The accurate prediction of some variables at early stages like production rate is necessary due to the significant losses that may occur if incorrect data is used. Incorrect estimates can affect the entire project as a developer can make wrong decisions about its feasibility and lose much money (Silva & Ayres da Silva, 2025).
The conversion from PFS to FS requires a change in approach as well as a substantial improvement in the quality of data required. While using preliminary testwork in a PFS, the base case scenario is achieved. After successful establishment that there is economic viability, the mine proceeds into its FS phase. During this stage, the assessment changes to refine and justify one particular technique selected during the PFS process. It is important to use this staged assessment early in the process to facilitate sample collection and minimize uncertainties as well as ensure sustainable mining (Dominy et al., 2018).
The FS provides the exact guidelines for implementation of the mine. As it often called the bankable document, it covers everything about final mine design, proper equipment sizing, capital expenditure estimates, and risks assessments. The purpose of the FS is to assess the feasibility from both technical and operational standpoints to give an accurate solution in regard to plant design and placement (Mukherjee & Roy, 2017). Contrary to PFS, the FS is a very comprehensive and highly accurate risk mitigation measure for mining construction and operation process.
Whereas the above two cases of the preliminary feasibility study and feasibility study differ, their meeting point is in the funding aspect. The institutional investors and financial institutions usually will not commit huge funds on the basis of PFS since it is prone to higher levels of errors. It is always necessary to conduct a full feasibility study that will confirm the exact scale of operation. Full feasibility study is vital for success since it aids managers in convincing stakeholders regarding the economic, technical, and legal considerations associated with the mining project (Mukherjee & Roy, 2017). This document becomes the most crucial tool used in obtaining finances since it will be proof to financiers that their investment is well-backed by the information provided.
In summary, both PFS and FS become highly important in helping the project of mining move forward. The PFS acts as an exploration exercise through which the best development plan for the mine can be determined. On top of this platform, FS provides the detailed information necessary for the financiers.
References
Dominy, S. C., O’Connor, L., Parbhakar-Fox, A., Glass, H. J., & Purevgerel, S. (2018). Geometallurgy—A Route to More Resilient Mine Operations. Minerals, 8(12), 560. https://doi.org/10.3390/min8120560
Mukherjee, M., & Roy, S. (2017). Feasibility Studies and Important Aspect of Project Management. International Journal of Advanced Engineering and Management, 2(2), 98. https://doi.org/10.24999/ijoaem/02040025
Silva, L. Z., & Ayres da Silva, A. L. M. (2025). Strategic Approaches to Define the Production Rate in Conceptual Projects of Critical Raw Materials. Resources, 14(1), 11. https://doi.org/10.3390/resources14010011
