Newmont Deep Post (CRF Plant)



Newmont Mining Corporation
Deep Post Mine
Carlin, Nevada, USA

150 yd3/hr CRF


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


  • Twin Shaft Mixer
  • Colloidal Mixer
  • Two Cement/Flyash Bins
  • Pneumatic Conveying System
  • Eight Screw Conveyors
  • Ribbon Blender
  • 1300 ton Aggregate Storage Hopper
  • Apron Feeder
  • Two Belt Conveyors
  • Backfill Mixer Structure
  • Control Room with MCC/PLC System
  • Dust Collection System
  • Pneumatic Control System

This multi-level plant is designed for automated backfill production at Newmont’s Deep Post Mine. The backfill plant utilizes a twin shaft mixer at the 4084 level, to mix backfill, discharging directly into haul trucks.

Aggregate is delivered underground by truck to a 1300 ton aggregate storage silo before feeding the mixer. Cement and flyash are pneumatically conveyed from surface and stored in bins on the 4290 level. Here, a blend is produced for delivery to the backfill area or an underground shotcrete plant. Once in the backfill area, blended cement is conveyed directly to the mixer or alternately, to the colloidal mixer for slurry batching.

All process are controlled by the operator using PC control, as the operator interface. Fiber optics are used to communicate with the five PLCs in the system.

Redundant features in the backfill plant ensure reliability. In the event the slurry mixer is unavailable, water and cement may be metered directly to the mixer. Should the main backfill mixer be unavailable, trucks may receive aggregate and slurry at the upper truck bay, ensuring backfill production continues.