Results are provided for the last hole drilled on the COD vein, surface prospecting samples, and the deep drill hole that tested a large geophysical anomaly.
Prospecting was done at the end of the field season for 2019 to evaluate targets for trenching and drilling in the coming year. One sample assayed 55.8 grams per tonne gold, 379 grams per tonne silver and 270 ppm tellurium. This grab sample was from a previously unknown occurrence of frost-heaved blocks of vein quartz containing pyrite. This site will be a priority for follow up trenching. Hole AMT19-01 was a designed to test a large geophysical anomaly and was drilled to a depth of 718.8 metres (2,358 feet). The core was logged for geological features and sampled at intervals ranging up to 3.05 metres in length. Geochemical results indicate elevated copper, zinc and iron between 90.31 and 718.7 metres (628 metres). Copper values averaged 249 ppm Cu in 38 of 62 samples that contained 100 ppm or greater copper, with values ranging from 102 to 837 ppm Cu. The highest copper value was for a 0.32 metre sample at 714.06 metres depth, where sulphide mineralization (pyrrhotite and pyrite) was observed. Zinc averaged 175 ppm Zn in 48 of 62 samples containing ppm 100 or greater zinc, with values ranging from 102 to 572 ppm Zn. Iron averaged 10.0% Fe in 48 of 62 samples containing 5% or greater iron, with values ranging from 5.27 to 12% Fe. The geochemically elevated values for copper, zinc and iron are associated with calc-silicate altered rocks and magnetite mineralization observed in the drill core. The calc-silicate alteration is developed locally, and the magnetite varies in intensity from veinlets to fine disseminations. This is interpreted as weak, skarn-type mineralization formed by iron-rich fluids that also carried copper and zinc. Historically, skarn-type copper-gold deposits were the main source of metals produced in the Greenwood camp. The
Skarn type mineralization typically occurs at or near the margins of porphyry-type granitoid intrusions, which likely generated metal-rich hydrothermal fluids that replaced calcareous rocks (limestone or dolomite). Porphyry dikes were intersected in hole AMT19-01, and although calcareous units were not seen in the core, limestone is known to be a minor component of the
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