Banks Island Gold Ltd.: The Yellow Giant Gold Project


The Design & Construction of a 600tpd gold processing plant within a CAPEX of $5 million. The project is located on Banks Island, British Columbia.

The Challenge:

To bring a small gold company from exploration to production on a tight budget in a remote location with demanding weather conditions.

Halyard Scope:

Phase I, 2013: EPCM retrofitting, commissioning and assistance with the operations of a Dense Media Separation Plant (DMS) for gold bearing ore pre-concentration.

Phase II, 2014: Project Management, EPCM and Commissioning of a new Ball Mill, Flotation and Filtration circuits.


A used DMS plant was acquired and redesigned to upgrade gold bearing ore and create a saleable gravity concentrate. This is the first time that the DMS process has been successfully used as a pre-concentration method for upgrading gold bearing ores.

Plant operation assistance was provided to increase mill throughput from 280tpd up to 600tpd. Additional systems were also put into place to manage scheduled maintenance and trend KPI’s (Key Performance Indicators) which significantly improved plant availability and concentrate production.

The remote location required detailed planning and contingencies to ensure that equipment arrived on time to meet the barge schedules thus keeping the project on track.

Careful consideration was made in the design, procurement, engineering and commissioning to account for challenging site weather conditions.


By successfully employing DMS as an initial process, Banks Island Gold was able to generate income earlier and assist in subsequent financing of the flotation plant.

The first shipment of DMS concentrate was sold in Q1 of 2014 and the first consignment of flotation concentrate shipped in Q3 of 2014.

The use of the DMS pre-concentration process enables non-mineralized material to be rejected prior to milling enabling a high-grade mill feed to be processed. This reduced the required mill capacity by approximately 50% creating significant CAPEX savings compared to traditional methods.

Phase II was completed on time and budget in Q3, 2014 to meet the company’s targets.