![]() The initial purchase price was about $4,000,000 while an additional $15,000,000 was invested in the retrofit for Nome mobilization. The BIMA, a 565 foot long bucket-ladder dredge operated by West Gold from 1987 to 1990 is the largest dredge to ever be mobilized in Nome. Since all of the material is excavated to the surface for separation, the environmental impact will be high with regard to material displacement and surface plume. Under excavation will result in lost gold and a higher spillage rate. ![]() ![]() Bottom coverage is nearly 100%, but the depth of cut is influenced by surface conditions, especially in rough seas. Bucket ladders can easily achieve 10km 3/day and operate to depths in excess of 50m. Their ability to reach near shore shallow areas is limited by their draft and the sea state. Accuracy is a function of vessel management usually achieved with spuds or anchors which is an art in its self. An initial cost will range from several million to 10s of millions depending on the production and depth of operation. They tend to be custom built for specific conditions. Bucket-Ladder dredges are very complex systems which require a large, highly skilled crew to operate.
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