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Government of Yukon; Government of Yukon; Heon, D.

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    A mineral assessment of the Tombstone Study Area was undertaken by the Department of Economic Development in the summer of 1998 at the request of the Department of Renewable Resources. The purpose of the mineral assessment was to produce a mineral potential map, which was to be used to assist with the finalization of the boundaries of the Tombstone Territorial Park. Following an initial compilation, a field program was designed to document known mineral occurrences, test and improve the existing regional mapping, investigate geochemical anomalies, characterize favourable environments for mineralization, sample for lithogeochemistry, and prospect for mineralization. A field program resulted in the discovery of several new mineral occurrences, as well as the discovery of previously unmapped geological formations. Fieldwork was followed by a compilation phase that integrated the new information to the existing geoscientific data. The geology of the study area was subdivided into thirteen geological tracts. A panel of five industry and government experts, familiar with the geology, mineral occurrences and mineral deposit types to be found in the area, was convened in June 1999. Based on the final compilation and their expertise, they produced a relative ranking of all the tracts according to their potential to host mineral deposits, from highest potential to lowest. The highest-ranking tracts are those that include, or are near the Cretaceous intrusions (Tombstone, Mount Brenner and smaller intrusions) and have strong potential for intrusion-hosted (Fort-Knox-type, porphyry uranium, skarn) and intrusion-related (skarns, veins, replacement) mineralization. Other tracts demonstrate potential for Wernecke Breccia, shale-hosted nickel sulphide, ultramafic-hosted nickel and listwaenite, Carlin-type, Mississippi-Valley-type or replacement lead-zinc, as well as volcanogenic mineralization. A final boundary was adopted in December 2000; it includes land outside of the original study area. This final boundary therefore includes areas that were not assessed in this study. All our wildlife sightings were documented and were included in the subsequent wildlife survey.

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    This report outlines the results and the conclusions of a study of the mineral potential of the Eagle Plains area. The accompanying mineral potential map ranks the different tracts according to their relative order of mineral potential, from highest to lowest. The highest ranking rocks occur on the flanks of the Richardson Anticlinorium which corresponds to the flanks of the southern Richardson Mountains. Other contributions resulting from this study include: complete geochemical coverage of the area provided by a new Regional Geochemical Survey and reanalysis of silt samples of a pre-existing survey; the discovery of several new mineral occurrences; the discovery of rocks of possible volcanic origin, previously undocumented in the area; and modifications to the pre-existing geology maps.