Natural Resources

Open File 012A/1562 - Till Geochemistry of the Red Indian Lake Basin (NTS Map Areas 12A/04, 5, 6, 7, 9, 10, 11, 15 and 16)

J.S. Organ

St. John's, Newfoundland, August, 2014

Abstract

This report provides the results of till-geochemistry surveys in the Red Indian Lake Basin completed between 2007 and 2012, in addition to previously released data. Analyses of 59 elements from 2253 BC- or C-horizon samples are presented. These data include analyses by ICP-OES for aluminum, arsenic, barium, beryllium, cadmium, calcium, cerium, chromium, cobalt, copper, dysprosium, iron, lanthanum, lead, lithium, magnesium, manganese, molybdenum, nickel, niobium, phosphorus, potassium, scandium, sodium, strontium, titanium, vanadium, yttrium, zinc, and zirconium; and by INAA for antimony, arsenic, barium, bromine, cerium, cesium, chromium, cobalt, europium, gold, iron, hafnium, lanthanum, lutetium, molybdenum, rubidium, scandium, samarium, selenium, sodium, strontium, tantalum, terbium, thorium, tungsten, uranium, ytterbium, and zirconium. A complete data listing is provided, including field-duplicate data, and individual element-distribution maps superimposed on a bedrock-geology base map.

The Red Indian Lake Basin has been the focus of mineral exploration, in particular for volcanogenic massive sulphide occurrences, for nearly 100 years. Many occurrences of Cu-Pb-Zn mineralization are associated with the felsic volcanic rocks of the Victoria Lake supergroup. It is, therefore, not surprising that tills derived from these rocks are enriched in these elements. Elevated values of Au and As are also present. Light and heavy rare-earth elements show elevated values in tills overlying plutonic rocks located north and east of Red Indian Lake.

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