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FAQs

Will our “cone of depression” extend to the Sheep Creek alluvium?

The cone of depression over the mine area extends slightly into the Sheep Creek alluvium with the largest drawdown near the western and southwestern edge of the alluvium. The drawdown in the alluvium adjacent to Sheep Creek is one foot. This indicates that the drawdown in the alluvium has the potential to slightly deplete flows in Sheep Creek. The numerical model shows that the potential maximum depletion in Sheep Creek is approximately 0.45 cfs (~200 gpm). The base flow (lowest yearly flow) of Sheep Creek is 6700 gpm, so our maximum effect on Sheep Creek could be 3% of its flow. We will be replacing more than this with our mitigation plan.