Cominco Polaris (CRF Plant)

 

Location

Cominco Limited
Polaris Mine
Little Cornwallis Island, Nunavut, Canada

SIZE / CAPACITY

190 tons per hour (Screening Plant)
125 tons per hour (Mixing Plant)

SERVICES PROVIDED

  • Conceptual Design
  • Structural/Mechanical Engineering
  • Design & Supply of Control System
  • Supply/Fabrication of all Equipment
  • Supervision of Equipment Installation
  • Commissioning and Training

SUPPLIED EQUIPMENT

  • 2000 liter Colloidal Mixer
  • Cement & Water Weigh Hoppers
  • Calcium Chloride Weigh Hopper
  • Four Screw Conveyors
  • Three Cementitious Silos
  • Dust Collection System
  • Progressive Cavity Pump
  • Cement Slurry Spraybars
  • Truck Dump Hopper
  • Cement Bag Unloading System
  • Two Apron Feeders
  • Two Belt Conveyors
  • 375 tonne Aggregate Storage Bin
  • Rotary Hot Water Bath System
  • 75 tonne Surge Bin
  • Vibratory Feeder and Screen Deck
  • Control Room/MCC/PLC System
  • Pneumatic Control System
  • Two 10,000 gallon Water Tanks
  • Heat Exchanger

Located only 100 km from the magnetic north pole, the Cominco Polaris lead-zinc mine is the most northerly operating mine in the world. When working north of the seventy-fifth parallel, the Arctic Ocean only allows a six week window in mid summer to allow sea access by freighter. Polar bears, caribou, arctic fox and musk ox are seen almost daily, within the boundaries of the mine.

In this project undertaken by Team Mixing Technologies, 27 truckloads of equipment had to be dockside in Montreal within a few months or the project would be delayed for a year. TMT delivered all equipment as required.

The plan called for 8″ minus aggregate, permanently frozen by Arctic conditions, to be brought in by haul truck, conveyed and stored in a 375 ton bin. The rock was then fed by a series of apron feeders, vibratory feeders, and conveyors through a pre-heat stage and hot water rotary bath to a second 75 ton storage bin.

Here, a TMT Tornado, employing four high shear colloidal mills combined a cementitious slurry with the heated rock. 30 ton haul trucks were then loaded with cemented rockfill for use in the underground mine. The heated CRF had to withstand unbelievable ambient temperatures approaching -70 degrees C, with wind chill.

A single Modicon PLC system with dual touchscreens was used to monitor and control the entire plant. TMT also provided site supervision and startup assistance to Cominco in prime Arctic conditions, October to April.