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Pugmill Delivered for Stevenson – Huntly, NZ

Jul 25, 2011 | Projects

Rocktec designed and installed a 400 tph continuous mixing plant at Stevenson Construction Materials’ Huntly site. Built for heavy-duty performance and efficient mixing, this system includes a pugmill, belt feeders, hoppers, and a radial stacker—providing reliable output for road construction and aggregate blending.

Project Overview: Continuous Mixing Plant for High-Volume Blending

  • Client: Stevenson Construction Materials
  • Location: Huntly, New Zealand
  • Industry: Quarrying / Civil Construction
  • Scope: Design and delivery of a 400 tph continuous mixing plant including pugmill, feeders, conveyors, and stockpile handling

400 tph continuous mixing plant at Stevenson Huntly site

The Challenge: Delivering High-Capacity Mixing with Flexible Output

Stevenson required a robust continuous mixing plant to handle multiple materials at scale. The system had to support variable feed rates, allow quick maintenance access, and deliver consistent material directly to trucks or stockpiles. Because the plant would operate in a high-throughput environment, ease of access and durability were essential.

Rocktec’s Mixing System Solution: Pugmill, Feeders, and Radial Stacker

400 tph continuous mixing plant at Stevenson Huntly site

To address these needs, Rocktec engineered a complete pugmill-based mixing system. The solution included:

  • Three infeed hoppers with internal top hats for belt protection
  • Electric belt feeders with integrated weighing scales
  • A pugmill featuring heavy-duty rubber-lined, hydraulically hinged side walls
  • A radial stacker for flexible material discharge into stockpiles or trucks

The design improves flow control, supports continuous operation, and enables safer maintenance access to the mixing chamber.

Installation and Integration of the Continuous Mixing Plant

  1. Design: Rocktec planned the layout to integrate with the site’s operating flow and terrain.
  2. Fabrication: All components were built off-site for quality assurance and timely delivery.
  3. Installation: The plant was assembled and tied into the site’s existing infrastructure with minimal downtime.
  4. Commissioning: Onsite testing confirmed full output capacity and material consistency.

Results and Benefits of the 400 TPH Mixing System

  • Consistent Output: The plant delivers 400 tonnes per hour with steady material flow.
  • Improved Access: Hinged pugmill walls simplify inspection and maintenance.
  • Flexible Discharge: The radial stacker allows fast switching between truck loading and stockpiling.
  • Precision Feeding: Integrated belt scales ensure consistent blend ratios across materials.

Conclusion: A Reliable Continuous Mixing Plant Built for Performance

400 tph continuous mixing plant at Stevenson Huntly site

This continuous mixing plant highlights Rocktec’s ability to deliver high-performance material handling systems with durable design, safe access, and efficient output. At Stevenson’s Huntly site, the system continues to support large-scale blending with minimal disruption and reliable daily performance.

Want to Learn More?

To explore large-scale blending and continuous mixing plant options, visit the QuarryNZ website.

If you’re planning a new mixing plant or want to improve an existing setup, contact Rocktec to get started.

Got Questions?

Get in touch with the Rocktec team for expert advice on engineering solutions & materials processing. Whether you need support, custom solutions, or have a general enquiry, we’re here to help — contact us today.

+64 7 881 9188

48 Mangawhero Road, Matamata 3400, New Zealand

Private Bag 4072, Matamata, 3440, New Zealand