RE: Valuation Musings18 Oct 2023 20:42
Hi Mh01 - I was looking through this too and also had a quick look through this document: that assists with mine closure guidance.
https://www.dmp.wa.gov.au/Documents/Environment/REC-EC-112D.pdf
Section 11, page 19;
11. Financial Provisioning for Closure
As per the Statutory Guidelines for Mine Closure Plans the mine closure plan must include the details of closure
costing methodology, including clearly documented assumptions and uncertainties.
The objective of financial provisioning for closure is to ensure that adequate funds are available at the time of closure
and that the community is not left with an unacceptable liability. To that end, it is essential that the cost of closure be
estimated as early as possible.
DMIRS recognises that providing verifiable closure cost estimates at the early stages of a mine’s life is subject to
many assumptions and unforeseen events. DMIRS expects assumptions to be summarised and ± cost variation to be
provided. This per cent variation should then be refined during operations and decommissioning.
The financial provisioning process and method(s) has to be transparent and verifiable, assumptions and uncertainties
have to be clearly documented, and they have to be based on reasonable, site-specific information and data
throughout the life of the project.
The closure cost estimates need to be regularly reviewed to reflect changing circumstances and levels of risk. This
will ensure that the accuracy of closure costs is refined and improved with time, and will assist with management and
mitigation of high-risk issues.
It should be noted that levies paid into the MRF required under the Mining Rehabilitation Fund Act 2012 and the Mining
Rehabilitation Fund Regulations 2013 are non-refundable and separate from the internal accounting provisions for
closure and rehabilitation and should not be used to offset the costs for rehabilitation. The mine closure plan must
contain a summary of the mine closure costing methodology, assumptions and financial processes to demonstrate
that the proponent has properly considered and fully understood the costs of meeting closure outcomes identified in
the mine closure plan, and made adequate provisions in corporate accounts for these costs.
The process and methodology for calculating the cost estimates must be transparent and verifiable.
Reference to the detailed closure costing methodology must be provided in the plan. Where necessary, DMIRS may
require a fully detailed closure costing report to be submitted for review, and/or an independent audit to be conducted
on the report to certify that the company has adequate provision to finance closure. Where appropriate, the costing
report should include a schedule for financial provision for closure over the life of the operation (ANZMEC/MCA 2000)
Info on MRF:
https://www.dmp.wa.gov.au/Environment/What-is-the-MRF-19522.aspx
https://www.dmp.wa.gov.au/Documents/Environment/ENV-MEB-381.pdf