The Red Dog mine, one of the largest zinc mines in the world, uses two lightering barges to transport zinc and lead concentrates from the port facility to ocean-going bulk carrier vessels at deep-water offshore anchorage. CWA was engaged to carry out an inspection of the material handling equipment, including a self-unloading belt conveyor system, aboard the two barges and to perform a detailed review of the barges’ current maintenance program.
CWA conducted the inspection in two phases. Phase 1 included an on-site visual review of the barge equipment in operation in Alaska, an inspection report summarizing the findings of the preliminary inspection, and a recommended scope of work for the Phase 2 inspection. Phase 2 occurred at the barges’ home port in Seattle, Washington and included a detailed visual inspection, non-destructive testing, motion checks, and a thorough documentation and maintenance program review.
CWA produced final reports for each of the two barges including:
- A prioritized summary of the findings.
- Estimates of the barges’ remaining serviceable lives.
- Repair recommendations.
- Estimated budget summaries for the repairs.
A report was also prepared that summarized the maintenance program review and provided recommendations to enhance the effectiveness of the program.