RTREYMOND TIMBULENG
SELECTED PROJECTS / 01

Underground Mining | Project Controls | Development Planning

Underground Dewatering Infrastructure Project

A US$20 million underground infrastructure project covering approximately 5.3 km of development, focused on strengthening long-term mine-water management and operational resilience.

My contribution included front-end development readiness, baseline scheduling, weekly progress control, delay analysis, stakeholder coordination, field verification, and manpower, equipment and material cost planning.

Explore the project
Reymond wearing protective equipment in the underground project environment
ON SITE / FROM PLAN TO PROGRESS
US$20MProject Value
~5.3 kmUnderground Development
WeeklyProgress Control Cycle
3Primary Cost DriversManpower | Equipment | Materials

WHY THIS PROJECT MATTERED

Dedicated infrastructure.
Long-term resilience.

Following the September 2025 external mud rush at the Grasberg Block Cave underground mine, strengthening mine-water management and reducing exposure to uncontrolled water and wet-material movement became an important operational risk-management priority.

The Underground Dewatering Infrastructure Project was developed to establish dedicated underground infrastructure supporting controlled long-term drainage and maintainable access for inspection and maintenance.

DRIFT 1

Service & Maintenance Access

Dedicated access supporting inspection, maintenance and infrastructure requirements.

DRIFT 2

Primary Drainage Pathway

Dedicated drainage infrastructure supporting controlled long-term mine-water management.

MY ROLE & CONTRIBUTION

Connecting the plan
with execution.

01

Front-End Development Readiness

Coordinated with Geo Engineering to assess rock-mass conditions and incorporate recommendations into excavation and ground-support readiness.

02

Baseline Scheduling

Built the development schedule from the beginning in Microsoft Project, including baseline, development sequence, milestones and delay tracking.

03

Weekly Progress Control

Updated development progress weekly and compared actual progress against the baseline schedule.

04

Delay Analysis

Identified delayed activities, assessed schedule impacts and coordinated actions required to maintain visibility of the execution plan.

05

Field Verification

Conducted underground field inspections to validate reported progress, understand field conditions and support stakeholder coordination.

06

Cost & Resource Planning

Estimated manpower, primary and support equipment, and ground-support material requirements to support project planning and cost control.

FRONT-END PLANNING WORKFLOW

Establish readiness.
Then build the baseline.

  1. 01Geo Review
  2. 02ATE / ATIGS Readiness
  3. 03Resource Planning
  4. 04Round Targeting
  5. 05Baseline Schedule
  6. 06Weekly Control

Development planning used a nominal advance of approximately 3.5 metres per heading round to translate planned development metres into daily and weekly round requirements.

ATE: Approval to Excavate · ATIGS: Approval to Install Ground Support

PROJECT CONTROL WORKFLOW

Keep the plan connected to field reality.

  1. 01Baseline Schedule
  2. 02Weekly Progress Update
  3. 03Plan vs Actual
  4. 04Delay Analysis
  5. 05Field Verification
  6. 06Stakeholder Coordination
  7. 07Cost & Resource Update

EVIDENCE OF WORK

In the environment.
Alongside the team.

Underground portrait of Reymond in protective workwear

01 / UNDERGROUND PROJECT ENVIRONMENT

Underground Project Environment

Supporting project planning, progress monitoring and field coordination within the underground operating environment.

Five project team members during an underground field inspection

02 / PROGRESS VERIFICATION

Actual Field Inspection

Progress verification with the project team supporting delay validation, field awareness and stakeholder coordination.

SCHEDULE EVIDENCE

Baseline. Progress.
Visibility of variance.

Anonymised Portfolio Reconstruction

Illustrative sequence and progress only. Bar lengths, periods, flags and milestones demonstrate the control method; they do not represent actual project dates, completion or delays.

Development sequence
P1P2P3P4P5P6P7P8
Development Package A
!◆
Development Package B
◆
Infrastructure Works
!◆
Connection Development
◆
Closeout / Handover
◆
BaselineActual / Progressed!Variance / Delay Flag◆Milestones

P1–P8 are generic planning periods. No internal system screenshots or raw schedule data are used.

RESOURCE & COST PLANNING

Three cost drivers.
One integrated plan.

01

MANPOWER

Crew demand, labour hours and supporting roles required to achieve the planned development rate.

02

EQUIPMENT

Primary development and support equipment required to sustain the planned development sequence.

03

MATERIALS

Ground-support material demand estimated against development scope and approved geotechnical recommendations.

WHAT THIS PROJECT DEMONSTRATES

Planning discipline.
Operational understanding.

Front-End Planning

Turning engineering and field requirements into an executable development plan.

Project Controls

Building and maintaining a baseline schedule supported by weekly progress updates.

Field-Based Verification

Using direct underground inspections to validate progress and understand schedule impacts.

Integrated Cost & Resource Thinking

Connecting development scope, manpower, equipment, materials, schedule and progress.

Supported the planning and control of a US$20 million underground infrastructure project covering approximately 5.3 km of development through integrated readiness planning, scheduling, weekly progress control, field verification, delay analysis, stakeholder coordination and resource-cost estimation.
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