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Alluvial fans, valley fills and debris cones represent economically significant, natural aggregate resources in the alpine regions of Austria. Due to continual erosion they constitute renewable sources of sand and gravel. However, knowledge of their petrographic properties and resulting aggregate quality is scant. An automated evaluation method was developed to estimate petrographic characteristics and predict resource suitability. This method makes use of the fact that the properties of a gravel deposit depend on the morphology and geology of the provenance area. Area percentages of geological units in the source area were expected to mirror the litho-spectrum of the gravel...

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