Havilah Resources has submitted a revised programme for environmental protection and rehabilitation (PEPR) document for its Portia gold project in South Australia.
The document was submitted to Department for Manufacturing, Innovation, Trade, Resources and Energy, and will enable government regulators to re-start regulatory assessment and approval of the project.
The company has addressed the disposal of excess water generated by dewatering of the Portia open pit in the revised PEPR document, which it proposes to inject the water into the nearby Shylock palaeochannel.
Havilah said extensive hydrogeological test work and modelling has demonstrated that it is viable under a most likely scenario and the Shylock palaeochannel could potentially take all excess water from dewatering of the Portia open pit that is not required for processing and other site usage purposes.
The company said that while evaporation ponds can achieve the disposal of excess water, it had the disadvantage of a large footprint and potentially increased soil salinity.
The design modifications for the tailings storage facility are likely to save Havilah significant capital expenditure, while eliminating the need for evaporation ponds should considerably reduce rehabilitation costs.
Portia has an inferred resource of 67,000oz of gold with Havilah is reported to have drilled 205 aircore holes.
Havilah controls over 6,500km² of continuous tenements in the mineralised Curnamona province with a variety of commodities, including copper, gold, molybdenum, lead, zinc, cobalt and uranium.