Stream sediment and water surveys were conducted in the Old Crow area of northwestern Yukon during the summers of 2004 and 2005. These surveys were carried out under a Joint Research Agreement between the Yukon Government (Oil & Gas and Mineral Resources Division of the Department of Energy, Mines and Resources) and the Federal Government, acting through the Earth Science Sector's Metals in the Environment Program. Analytical data accompany this document for 50 elements in stream sediments and 60 variables in waters from a total of 655 sites sampled in 2004 and 2005. National Geochemical Reconnaissance protocol was used for the collection, preparation and analysis of waters and silts.

not_specified

These data are included in the 2020 release of the Regional Geochemical Surveys (RGS) compilation. To download the data please go to http://data.geology.gov.yk.ca/Compilation/21#InfoTab.

not_specified

Stream sediment and water geochemistry for the Stewart River map area. The following stream sediments were analyzed: Ag, As, Au, Ba, Cd, Co, Cu, F, Fe, Hg, Loss-on-ignition, Mn, Mo, Ni, Pb, Sb, Sn, U, V, W, ,Zn. Stream waters were analyzed for pH, uranium, and fluoride.

This data package contains results for parts of the Stewart River area (NTS 115N east and 115O). This information has been provided in a variety of digital formats. PDF files include survey descriptions and details regarding methods, analytical data listings and summary statistics. Raw digital data of original field and analytical information plus new reanalysis results are included in Microsoft®Excel (XLS) format.

Geochemical data from regional geochemistry survey samples from Yukon have undergone exploratory data analysis and principal component analysis. The results of these analyses clearly demonstrate geological control on the distribution of a number of important commodity and mineral deposit pathfinder elements. Catchment basins have been delineated for the samples and the dominant simplified geological unit in each catchment basin used to level the geochemical data where appropriate. Levelling the geochemical data in this fashion generally fails to fully account for enrichments in many commodity and mineral deposit pathfinder elements in the bedrock due to practical limitations on the resolution of the mapping and knowledge of the relative contributions of different geological units, although the resulting data interpretation is an improvement on one based solely upon raw geochemical data. Weighted sums models have been generated for the deposit types that either exist within the individual map areas covered by this report or are considered by the authors to be of exploration significance. Separate catchment maps showing the distribution of stream water pH and the concentration of elements inferred to have accumulated through hydromorphic dispersion are also provided. An additional series of maps has been generated to display weighted sums models calculated using regression of commodity and mineral deposit pathfinder elements against those principal components containing the same elements that show the strongest spatial associations with bedrock geology. Both model types have been iteratively tested using known mineral occurrences in the relevant map areas and, for the most part, are compatible with the distribution of known mineralization where sampling coverage is adequate. Geochemical anomalies unrelated to known mineral occurrences are evident in both data sets and provide possible targets for further investigation.

NGR surveys were originally conducted in the McQuesten map area in 1987 and 1988. Stream sediment and water samples were collected from a total of 841 sample sites. A total of 841 original samples were selected for reanalysis. Representative 2 gram splits were successfully recovered from 840 samples. Samples were analysed by an ultra-trace aqua-regia digestion ICP-MS package for 53 elements.