The Operating Cost Expenditure Estimating Guideline document spans 44 pages, structured into six sections: Policy, Scope and Purpose, Introduction to OPEX, Overview, Details per Key Steps, and How to Use this Document. Additionally, there are three appendixes at the end. Within the Introduction to OPEX section, there are four subsections: Introduction, Description, Purpose, and Responsibilities, each offering comprehensive information. The Overview section contains five crucial pages, including a meticulously crafted overview of the key steps, spanning three pages. The Details per Key Steps section encompasses 23 pages, delving into 12 different key steps, each accompanied by an in-depth explanation, process breakdown, and guideline. This document represents the culmination of extensive financial and mining expertise garnered over many years from individuals with a wealth of knowledge.