Abstract: Mapping in the Black Hills Creek drainage has identified auriferous gravel resources in valley bottom and terrace deposits of the main stream. Both low-level and high-level terrace gravels and modern floodplain contain fine gold grains. Bulk gold counts determined from sluice box testing of 57 samples indicates concentrations decrease in the downvalley direction. Geochemical analysis of matrix samples (finer than 60 mesh) mimics bulk results. The apparent lower concentration of detrital gold in a downstream direction may be explained by lack of bedrock sources and insignificant enrichment from tributaries.

Bedrock terraces high above the creek level record periods of stability at high base levels which was followed by incision and aggradation of alluvial sediments in late Tertiary(?) time. Thick sediments in low-level terraces indicate a long period of aggradation followed by organic accumulation. Holocene activity has degraded the valley fill and redistributed sediment downstream in fining upward meander stream deposits. Permafrost is present in black muck sequences.

Authors: Fuller, E.A. and Andersen, F.J.

Map Scale: 1 : 0

NTS Mapsheet(s): 115O07, 115O10

Citation: Fuller, E.A. and Andersen, F.J. , 1993. Placer geology of Black Hills Creek (Parts of 115 O/7 and 10). In: Yukon Exploration and Geology 1992, Yukon Exploration of Geology , Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, 33-38.

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