& Audit Review April 2012 Keno Hill Project Overview Water - - PowerPoint PPT Presentation

April 2012

Demand Side Management & Audit Review

Keno Hill Project Overview KENO HILL SILVER DISTRCIT

Water Treatment & Environmental Monitoring Reclamation & Remediation Environmental Consulting & Closure Planning Underground Mining Keno Hill District Mill Exploration & District Development

• Identified areas which allow Alexco to:

 Reduce peak usage  Reduce total energy usage  Identify possible efficiencies  Further reduce energy footprint

KEY Reasons for Involvement

2011 Demand Side Management Energy Audit

• Mutually beneficial partnership between YEC & Alexco

Demand Side Energy Consultants

Study Scope

1. Observation of Keno Hill Project

• perational

procedures 2. Comparison of

• ther projects to

Keno Hill Project 3. Analysis of utilization rates &

• perational

parameters 4. Final report & recommendations to Alexco & YEC 1 week at site Off-site consulting work Database comparison for efficiency gains Large equipment such as: air compressors, crushers, blower, ball mill … Operational recommendations & capital projects

Typical Energy Profile

0.00 200.00 400.00 600.00 800.00 1,000.00 1,200.00 1,400.00 1,600.00 3/18/2012 14:45 3/19/2012 3:45 3/19/2012 16:45 3/20/2012 5:45 3/20/2012 18:45 3/21/2012 7:45 3/21/2012 20:45 3/22/2012 9:45 3/22/2012 22:45 3/23/2012 11:45 3/24/2012 0:45 3/24/2012 13:45 3/25/2012 2:45 3/25/2012 15:45 3/26/2012 4:45 3/26/2012 17:45 3/27/2012 6:45 3/27/2012 19:45

• Base Load = Daily Steady State

Operations

• All infrastructure must be sized

to peak load

• Peaks are associated with ore

crushing operations

Recommendations of Demand Side Audit

• 1. Instillation of an ammeter in Mill
• perators cab
• 2. Convert plant lighting to T5 HO

fluorescents & LED’s for outdoors

• 3. Re-commission mill air system
• 4. Initiate compressed air leak

reduction program

• 5. Commission the air blower inlet

modulation

• 6. Re-apply variable frequency drives to

Mine ventilation

• 7. Optimize plant process thru program

logic controller

• 8. Install electrical sub-metering for

Mine

• 9. kWh per tonne as performance

measure 10.Install capacitors on the 600V Mill

Status of Recommendations

 Investigation of alternate lighting options (LED’s) - in progress  Mill compressed air system has been re-commissioned  Ongoing air leak reduction program at Mill & Mine  Additional variable frequency drives have been installed  Program logic control on filter presses implemented  Evaluation of site power distribution & metering options - in progress  Cost benefit analysis & design of power factor correction unit for the Mill – in progress

Power Factor (PF)

• Power Factor is a measure of how

effectively the power is being used and is a ratio of “active power” used to the “apparent power” required which is a combination of both active power & reactive power

• 0.85 for normal operations
• 0.75 for peak loading conditions
• For every unit of power

required to run upwards of 15-20% more power needs to be provided

• 0.95 – 0.98 PF with correction
• PF = Active Power / Apparent Power

Future Considerations

• Increased use of variable frequency drives on motors
• Power factor correction studies
• Energy measuring devices
• Alternative lighting sources
• Proper equipment sizing & selection
• Ongoing evaluation of operational practices

Alexco Contact Info Peter Johnson – Construction Manager

Vancouver Head Office 1150 – 200 Granville St. Vancouver, BC V6C 1S4 T: 604-633-4888 F: 604-633-4887 Whitehorse Office #3 Calcite Business Centre 151 Industrial Road Whitehorse, Yukon Y1A 2V3 T: 867-633-4881 F: 867-633-4882 Keno Hill Silver District Elsa, Yukon Y0B 1G0 T: 867-996-2330 F: 867-995-2600