Beginning in 2006, Mr. Billin designed a pit dewatering treatment plant for NovaGold Resources at the Rock Creek Mine in Nome, Alaska. The WTP was constructed in 2007 and Linkan staff have been pivotal in the complex operation of the plant in this remote location. The original plant was designed to treat 700 gpm of pit dewatering fluids for elevated arsenic and antimony.
Linkan staff conducted onsite bench testing services using the existing exploration and monitoring wells in order to develop a process for rapid deployment. The facility was constructed using an EPCM delivery method with Linkan staff playing key roles in the procurement, expediting, and air freighting of the materials to this roadless location.
The initial plant utilized oxidation with hydrochloric acid, ozone and ferrous sulfate addition for antimony removal by ferric hydroxide adsorption in a first step lamella clarifier. Bench testing had indicated that a target pH of 4.5 was optimal for antimony removal. A second step involved raising the pH to 6.8, adding additional ferrous sulfate, and filtering the precipitate to 0.1 micron with a Pall microfilter. Treated effluent was then discharged to groundwater by means of 39 groundwater injection wells through permafrost.
Following commissioning of the plant, NovaGold’s water treatment needs varied drastically as the mine went into care and maintenance and ultimately closure. Linkan staff played a critical role in modifying the plant several times to address new and changing water sources and water contaminants.
- Remote location
- Simultaneous treatment of As, Sb, Mn, and WAD CN
- Several modifications to WTP to address multiple water treatment needs
2006 – present
- Process Development
- Bench Testing
- Detailed Design
- Construction Supervision
- Full-time Operations
- Off-Site Supervisory Operations