Leeville CRF Plant

 

Location

Newmont Mining Corporation
Leeville Mine
Carlin, Nevada, USA

SIZE / CAPACITY
20 m3/hour per plant

SERVICES PROVIDED (complete plant)

  • Conceptual Design
  • Structural/Mechanical Engineering
  • Electrical Design
  • Procurement
  • Fabrication
  • Commissioning/Training & Site-Support

SUPPLIED EQUIPMENT Surface (Slurry System)

  • SD 2200 Colloidal Mixing System
  • 225 ton Flyash Silo
  • Refurbished 225 ton Cement Silo
  • Feed Screw Conveyors
  • Admix Dosing System
  • Slurry Transfer Pump
  • PLC control system
  • Containerized NEMA MCC Vault
  • Pulse-Jet Dust Collection System
  • Pneumatic Controls

Following Team’s successful Deep Post Underground Backfill project, Team Mixing Technologies Inc. was again commissioned by Newmont Mining Corporation to design, engineer, fabricate and commission Leeville’s proposed Twin Underground Backfill Plants and surface slurry plant.

The entire system is monitored and controlled by a network with one PLC on surface and two PLCs in a control room at the 1590 level at one of the backfill plants. One operator may control both rockfill plants simultaneously. Motor Control Centers are located on surface, at the 1440 level for aggregate handling and at the 1590 level for the cemented rockfill plants.

SURFACE SLURRY EQUIPMENT:

Unlike Newmont’s Deep Post Mine, Leeville’s design was to retain all dry cement and flyash apparatus on surface and pre-mix slurry using a colloidal mixing system. Water and admixtures are also added at the colloidal mixer according to mix design. Automatic water purges and wash batches ensure the mixer and lines remain clean. Slurry is then delivered underground via a pipeline in the ventilation shaft, and through diverter valves and boreholes to either a remix bay on 1465 level, or to agitation tanks above the individual backfill plants on the 1590 level.

Location

Newmont Mining Corporation
Leeville Mine
Carlin, Nevada, USA

SIZE / CAPACITY

420 ton per hour

SERVICES PROVIDED

  • Conceptual Design
  • Structural/Mechanical Engineering
  • Fabrication of all Equipment
  • Commissioning, Training & Site-Support

SUPPLIED EQUIPMENT 1440 Level Equipment

  • Aggregate Transfer Chute/Hopper
  • Apron Feeder
  • Support Structure & Access Platform
  • Aggregate Transfer Belt Conveyor
  • Pneumatic Actuated Shuttle Chute
  • Transverse Belt Conveyor
  • Pulse-Jet Dust Collection System
  • 2 Aggregate Silo Cover Structures
  • PLC Control System
  • Motor Control Center & Enclosure
  • Pneumatic Control System
  • Other Miscellaneous Equipment

AGGREGATE EQUIPMENT:

Crushed and screened aggregate, is prepared on surface and delivered underground via a skip installed in the ventilation shaft. A dump pocket is situated on the 1350 level. A short, lined raise transfers material down to the 1440 level through a transfer chute and onto a 420 tph apron feeder.

A 48” wide belt conveyor then transfers the aggregate to a shuttle chute situated atop a 1000 ton capacity excavated silo. At this juncture, aggregate is either diverted into this silo (#2) or directed onto a 36” wide conveyor which feeds aggregate silo #1. Laser level sensors are used to continuously monitor material levels in the silos and dump pocket. A pulse-jet dust collection system reclaims fugitive dust (collected at multiple points on the level) back into silo #1.

On the 1590 level, each of the aggregate silos transition into an expanding flow hopper. 1000 tph apron feeders then feed the  aggregate onto 48” wide belt conveyors for charging the twin-shaft CRF batch mixers. These final conveyors incorporate weigh scales to proportion the aggregate quantities for each CRF batch.

 

Location

Newmont Mining Corporation
Leeville Mine
Carlin, Nevada, USA

SIZE / CAPACITY
5,600 tons per day

SERVICES PROVIDED

  • Conceptual Design
  • Structural/Mechanical Engineering
  • Fabrication of all Equipment
  • Commissioning, Training & Site-Support

SUPPLIED EQUIPMENT 1590 Level Equipment (Plants 1&2)

  • 2 Aggregate Silo Expanding Flow Hoppers
  • 2 Apron Feeders & Access Platforms
  • 2 Mixer Feed Conveyors
  • 2 Mixer Structures with Access Platforms
  • 2 Bridge Cranes
  • 2 Simem MSO 9000Q Twin Shaft Mixers
  • (8 yd3 capacity at zero slump, hydraulic discharge gate, self-washing system)
  • 2 Pulse-Jet Dust Collection Systems
  • 2 PLC Control Systems
  • 2 Pneumatic Control Systems
  • Control Room with Lighting & HVAC
  • Motor Control Center Vault
  • Other Miscellaneous Equipment

TWIN CRF PLANTS:

The two backfill plants are virtually identical in layout. Each houses a twin shaft mixer capable of batching 8 yd3 of zero slump cemented rockfill and is complete with an overhead bridge crane to facilitate maintenance and repair. The mixers are elevated to provide drive-through access for the haul trucks.

1200 USgal slurry agitation tanks sit atop the structures to gravity feed slurry into the mixers. The tanks use load cells to subtractively weigh the correct amount of slurry into the mixer. The agitation tanks are replenished automatically by the surface slurry plant.

Additional make-up water (monitored by a mag-flow meter) is also introduced into the mixer to attain the final desired water:cement ratio for the CRF batch.

Each plant also houses its own pulse-jet dust collection system which reclaims dust to the belt conveyor feeding the mixer.