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Bullboard - Stock Discussion Forum Northern Dynasty Minerals Ltd NAK


Primary Symbol: T.NDM

Northern Dynasty Minerals Ltd. is a Canada-based mineral exploration and development company based in Vancouver. The Company’s principal business activity is the exploration of mineral properties. The Company’s principal asset, owned through its wholly owned subsidiary, Pebble Limited Partnership, is a 100% interest in a contiguous block of about 1,840 mineral claims in Southwest Alaska... see more

TSX:NDM - Post Discussion

Northern Dynasty Minerals Ltd > Water treatment/liability in perpetuity. No miner interest.
View:
Post by RealityCheck123 on Mar 07, 2024 8:22pm

Water treatment/liability in perpetuity. No miner interest.

https://www.mdpi.com/2075-163X/10/8/727

"The pit will require perpetual pump and treat management. We conducted geochemical and integrated groundwater–surface water modeling and streamflow mixing calculations to examine alternative conceptual models and future mine abandonment leading to failure of the water management scheme 100 years after mine closure. Using EIS source water chemistry and volumes and assuming a well-mixed pit lake, PHREEQC modeling predicts an acidic (pH 3.5) pit lake with elevated copper concentrations (130 mg/L) under post-closure conditions. The results are similar to water quality in the Berkeley Pit in Montana, USA, another porphyry copper deposit pit lake in rocks with low neutralization potential. Integrated groundwater–surface water modeling using MIKE SHE examined the effects of the failure mode for the proposed 20-year and reasonably foreseeable 78-year expansion. Simulations predict that if pumping fails, the 20-year pit lake will irreversibly overtop within 3 to 4 years and mix with the South Fork Koktuli River, which contains salmon spawning and rearing habitat. The 78-year pit lake overtops more rapidly, within 1 year, and discharges into Upper Talarik Creek. Mixing calculations for the 20-year pit show that this spillover would lead to exceedances of Alaska’s copper surface water criteria in the river by a factor of 500–1000 times at 35 miles downstream. The combined modeling efforts show the importance of examining long-term failure modes, especially in areas with high potential impacts to stream ecological services."

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