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Mine Planning Aspects, Strategic Planning Aspect, Site Costs Aspect -…
Mine Planning Aspects
Five Year Plan:
-2 year plan completed, 3-5 year in progress
-Plan considers:
-North Wall 58º
-Trolley system
--2022-2023 Mine plans should include a greater level of activity based planning considering all activities happening over next two years.
-Target max variation of 10% on major KPI's
-Consider Phase Interactions
-Consider ore depletion (serrucho curves)
Spillage:
-Spillage is reality and should be considered in phase designs
-Include spillage catch berms in phase designs.
-Simulate spillage
-consider this in saddle zone and west pit desgins
Bulk or Flitch Mining:
-Objective of flitch mining not clearly defined
-Have clear benefits of flitch mining been achieved?
-Driven by operation aspects of shovel deployment rather than economic decisions.
-Should 75-80% mining with ropes be considered?
-With transition to 28Mt/y the required approach to selective mining will change. Consider targets for reducing unit operating costs, maximum metal extraction and dilution opportunities.
-cross mine rationale study be performed by MTS to determine preferred process throughput, mine capacity and preferred selective mining unit. All aspects should be considered including tailings capacity, mining method changes and plant flowsheet options.
Compliance Reporting:
-Use adherence and conformity
-use plus/minus proposed method which uses equivalent amount of waste.
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Risk Analysis:
Conduct risk analysis for mine plans.
-Power distribution added to current list
-consider others like permitting, tailings, etc.
-Primary risks include spillage, bench/ramp congestion
-Consider risk matrix in 2022 LOM design
-Assess potential metal production impact with risk-adjusted NPV
-some low/medium level risks may be understated
Other points and planning recommendations:
-good monthly reports
-single software employed. Still use novel software where applicable
Recommendations:
-Continue Mine planning compliance (enhance to report mine plan balance: equivalent waste, backlog
-Include Ore depletion curves
-Assess benefit of >7495 use and minor increase in bench height to reflect more drills with taller masts
-Assess if maximum metal extraction and minimal dilution is being achieved with current flitch mining practice. Flitch decision should be based on economics.
-Reassess preferred selective mining unit considering overall site objectives. Perform overall assessment of bulk vs. semi-selective mining operations considering all cross mine disciplines and a process throughput rationalization.
-Continue road improvement program. Consider alternative intersection layout (by traffic engineer) considering trolley assist and autonomous haulage.
-consider congestion in design informed by dispatch data
-understand and justify reason for ore re-handle. Identify lowest-cost method for ore re-handle. Target reduction in qty and cost.
-Increase use of blast masters
-increase level of activity based planning
-Enhance 5 year mine plan to a business plan level of accuracy +/- 10%
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Site Costs Aspect
2022/2023 Budget:
-Aligned with LOM and benefit from reduced waste mining from steepened north wall.
-Cash cost increase from higher consumer prices, higher process throughput, increased maintenance costs and lower deferred stripping.
-camp costs reassigned from admin to operating cost areas.
-reduction in FX (C$/US$) and generally aligned to actuals.
-Increase in headcount (+2.6%)
-planned increase in Labour costs
-reduction in tire consumption (-13.8%)
-significant increase in cost of grinding media and reagents.
-investment in human capital is complex and logical in post-pandemic environment to retain personnel
Significant Mining Escalation in most mine consumables and associated logistics costs in 2021 as a consequence of post pandemic conditions.
Some commodity costs have increased between 10-40%. In addition cost of mining equipment has also increased.
Not clear if this cost escalation has been adequately considered in budget
-Most unit mining 2022 budget costs marginally lower than 2021 9+3 F
-14.8% higher than LOM
-most notably ROM re-handle. Evaluate methods for lowering re-handle costs.
-795's are high operating and has been retired early from operations at a number of mine sites. Consider an early transition strategy.
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Key Target: Sustainable Cost Reduction through safe and efficient operations.
-Efficiency is the best form of achieving unit cost reduction.
-Emphasis in next years should be on efficiency and low cost innovation.
Scrubbing exercise conducted on capital costs and identified savings for potential deferment.
Recommendations for potential unit cost reduction:
-Early transition 795 to 798 truck fleet.
-Increased assignment of loading activities to rope shovels.
-Assessment of preferred operational practice at Detour considering more bulk mining rather than bulk/selective process.
-Increase mining efficiency in all areas.
-Optimization of ore re-handle process.