Map and report listing information on 419 mineral ocurrences in Yukon that contain noteworthy amounts of gold and/or silver. A capsule description of the occurrence's geology is present along with a list of the significant ore minerals. This is followed by information on the metal content of the occurrence and extent of exploration and development work. Accompanying this report is a 1:2,000,000-scale map of gold-silver deposits and occurrences in the Yukon Territory.

Yukon Gold-Silver File is an inventory of gold and silver-bearing mineral deposits and occurrences in Yukon. It follows the 1984 Open File entitled Gold-Silver Deposits and Occurrences in Yukon Territory by J.A. Morin and D.A. Downing. Other sources of information include: 1) Indian and Northern Affairs Canada Reports, including a) Yukon Exploration and Geology reports up to and including Yukon Exploration 1984-86 (noted as YEX, YEG and YGE), and b) Mineral Industry Reports (MIR); 2) preceding Mineral Industry Reports and other geological reports by the Geological Survey of Canada (GSC Papers, memoirs, bulletins and maps); 3) assessment reports (only non-confidential information is included) filed by mineral exploration companies with Indian and Northern Affairs Canada; 4) university theses; 5) personal communication with mineral explorationists and prospectors; and 6) data accumulated by property investigations by J.A. Morin and D.S. Emond (until August, 1987).

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One third of the gold and gold-silver deposits in Yukon were examined and sampled in 1980 to establish a framework of geology and rock chemistry from which variations within and between deposits could be detected and evaluated. Lithologic units within the samples were analyzed for Au, Ag, B, Mn, Cu, Zn, As, Se, Tl, Pb, Bi, Sb, Te, W, Hg, Mo and Cd - elements commonly associated with precious metal deposits. A problem which prevented systematic sampling of many deposits is the lack of underground access and the locally intense oxidation of vein outcrops. Three aspects of the rock geochemistry are discussed:: 1) different levels of element concentration in the deposits and implications regarding pathfinder elements; 2) distribution of elements in deposit types; and 3) element distribution in specific deposits. The geology of the deposits is summarized from published works and interpreted in light of recent theories on gold deposits. This report emphasizes common features of the deposits and several genetic models.

Occurrences of placer platinum-group minerals (PGM) were reported in several gold placer deposits in Yukon. The source rock and the type of platinum mineralization are not known for these localities. We investigated five grains of Pt-Fe alloy from Burwash Creek (map area 115G and F), one grain from Scroggie Creek (map area 115O and N) and one grain from Wolverine Creek (map area 105C and D). Results of multiple electron microprobe analysis display elevated levels of Pd, Rh, Ir and Cu in these Pt-Fe alloy grains. The grains host micro-inclusions of various species of PGMs and silicate-melt inclusions with diopside, albite and sodic-calcic amphiboles. Trace element composition of the silicate inclusions determined using laser ablation ICP-MS shows a notable enrichment in large ion lithophile elements. We infer that the reported association of PGM and the trace element composition of silicate-melt inclusions observed in the studied grains are likely derived from a subduction-related Alaskan-type mineralization.

Contains PDF maps of regional mineral potential by deposit models for Yukon. Also included is a PDF document containing methodology, limitations, and a description of the data used for the assessments. There are three directories: Report folder - open file report in WORD format and PDF format. Index folder- PDF map showing tract numbers; and PDF table of deposit models assessed in each tract. Maps folder - 18 PDF maps of regional mineral potential by individual deposit model.

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