![]() ![]() One interpretation is that productive placer deposits at Bangor Creek, Monument Creek, Boulder Creek, Glacier Creek, and Rock Creek were effectively cut off at the flood plain of Snake River by a glacier that occupied the main valley of the ancestral river. ![]() The gold in the auriferous glacial deposits was at least partly derived from gold-bearing alluvium in the ancestral Snake River. The offshore marine glacial deposits have been mapped by high-resolution seismic studies, first by Tagg and Greene (1973), then, using refined instruments and techniques, by Graul and others (1989). The glacial deposits are roughly centered on the projection of Snake River, before it makes an abrupt easterly turn to its present mouth. Gold also occurs in lag deposits formed from weakly auriferous glacial drift and outwash far from the modern beach deposits. ![]() In that, these craft are also contributors to their own, self-made landscapes that again, it is argued, are unique maritime cultural landscapes.Some of the offshore gold is derived from the abrasion platform immediately offshore of the modern beach. Vast landscapes of dredge soil, altered ecosystems, and associated infrastructure are evidence of the evolution of gold mining in an increasingly industrial progression. While only a handful of dredges are known to exist as archaeological sites or are preserved as historical sites, the material record of their activities is much larger. These dredges are, as floating craft, maritime archaeological resources as well as historical and mining archaeological resources. Floating in ponds they had self-excavated, these large floating industrial facilities represented the last stage of placer gold mining as the late nineteenth century transitioned into the early twentieth. Based on a North American assessment of all known surviving examples, including those preserved as historic sites as well as archaeological resources, the maritime origins, of these craft are clear in the construction of their hulls as well as the matrix in which they worked. Bucket-ladder dredges are a relatively rare maritime archaeological and historical resource. ![]()
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