{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T08:41:08Z","timestamp":1759826468938},"reference-count":30,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[2017,2,1]],"date-time":"2017-02-01T00:00:00Z","timestamp":1485907200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["GEEA"],"published-print":{"date-parts":[[2017,2]]},"abstract":"<jats:p>A comprehensive program of indicator mineral and geochemical sampling of both oxidized and unoxidized till at the glaciated Blackwater Au-Ag deposit in the interior of south-central British Columbia, Canada has provided key insights into glacial and post-glacial dispersal patterns that can be used to explore other glaciated regions more effectively.<\/jats:p>\n          <jats:p>\n            The Blackwater deposit is located on the northeastern slope of Mount Davidson and is completely covered by till that was deposited by NE-flowing ice. Only the sulphide-depleted supergene cap of the deposit was exposed to the ice. Indicator mineral sampling of C-horizon till on the mountain slope identified a 1.3\u2005km wide gold grain dispersal train that extends\n            <jats:italic>c.<\/jats:italic>\n            3\u2005km glacially down-ice and 200 vertical metres down-slope from the deposit. The till within this train contains from 10 to 641 gold grains, dominantly of 25\u2005\u00b5m size, per 10\u2005kg of its &lt;2\u2005mm matrix. As well, the 0.25\u2009\u2013\u20090.5\u2005mm fraction contains up to 25\u2009000\u2005grains per sample of spessartine garnet derived from the hypogene alteration envelope of the Blackwater deposit, increasing the probable detectable length of the train to 10\u2005km. Geochemically, in the &lt;0.063\u2005mm fraction of the till, the detectable length of the train is reduced to &lt;1\u2005km, with the best indicator elements being Au and Zn.\n          <\/jats:p>\n          <jats:p>\n            In drill holes, the host till is oxidized to a depth of 2\u2009\u2013\u20095\u2005m. It thickens markedly downslope from a few metres to\n            <jats:italic>c.<\/jats:italic>\n            100\u2005m. The gold-spessartine dispersal train thickens sympathetically to nearly 30\u2005m and also ascends progressively within the till section. Gold grain and spessartine levels in the unoxidized till at depth are similar to those in the oxidized till at surface but the unoxidized till also contains up to 60\u2009000\u2005grains per sample of metal-rich pyrolusite derived from supergene cap of the Blackwater deposit.\n          <\/jats:p>","DOI":"10.1144\/geochem2015-399","type":"journal-article","created":{"date-parts":[[2017,2,8]],"date-time":"2017-02-08T01:25:25Z","timestamp":1486517125000},"page":"43-60","update-policy":"http:\/\/dx.doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["The Blackwater gold-spessartine-pyrolusite glacial dispersal train, British Columbia, Canada: Influence of sampling depth on indicator mineralogy and geochemistry"],"prefix":"10.1144","volume":"17","author":[{"given":"Stuart A.","family":"Averill","sequence":"first","affiliation":[]}],"member":"1881","published-online":{"date-parts":[[2017,2,7]]},"reference":[{"key":"e_1_3_2_3_1","first-page":"271","volume-title":"Prospecting in Area of Glaciated Terrain - 1988.","author":"Averill S.A.","year":"1988","unstructured":"Averill, S.A. 1988. Regional variations in the gold content of till in Canada. In: MacDonald, D.R. & Mills, K.A. (eds) Prospecting in Area of Glaciated Terrain - 1988. Canadian Institute of Mining and Metallurgy, Geological Division, Halifax, 271\u2013284."},{"doi-asserted-by":"crossref","unstructured":"Averill S.A. 2001. The application of heavy indicator mineralogy in mineral exploration with emphasis on base metal indicators in glaciated metamorphic and plutonic terrains. In : McClenaghan M.B. Bobrowsky P.T. Hall G.E.M. & Cook S.J. (eds) Drift Exploration in Glaciated Terrains . Geological Society London Special Publications 185 69\u201381 https:\/\/doi.org\/10.1144\/GSL.SP.2001.185.01.04","key":"e_1_3_2_5_1","DOI":"10.1144\/GSL.SP.2001.185.01.04"},{"doi-asserted-by":"publisher","key":"e_1_3_2_6_1","DOI":"10.1144\/1467-7873\/10-IM-022"},{"unstructured":"Averill S.A. 2013 a . Indicator mineral fingerprints in surficial sediments near Cu-Au deposits of the porphyry-epithermal-volcanogenic suite. The Association of Applied Geochemists 26th International Applied Geochemistry Symposium Workshop SC07: Application of Indicator Methods to Mineral Exploration. Rotorua New Zealand November 18\u201321.","key":"e_1_3_2_7_1"},{"key":"e_1_3_2_8_1","first-page":"37","volume-title":"New Frontiers for Exploration in Glaciated Terrain.","author":"Averill S.A.","year":"2013","unstructured":"Averill, S.A. 2013b. Discovery and delineation of the Rainy River gold deposit using glacially dispersed gold grains sampled by deep overburden drilling: A 20 year odyssey. In: Paulen, R.C. & McClenaghan, M.B. (eds) New Frontiers for Exploration in Glaciated Terrain. 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