Geology Introduction Introduction

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Geology introduction Introduction • Location of the Grampian Project and Cononish deposit • Geology of Scotland • How and when the geology we see in Tyndrum today formed • The history and geology of the Cononish gold deposit Location Geology of Scotland Geology of Scotland • 5 distinct terranes form 1 2 Scotland 3 • England once separated by an ocean 4 5 • Terranes defined by different geology England • Currently in Grampian terrane Geology of Scotland • Grampian terrane is part of the Caledonide belt • Mountain range similar size to the Alps • Stretching from Norway through Scotland, Ireland, Newfoundland to Appalachains, USA. Geology of Scotland • In Scotland Grampian terrane consists of Dalradian Supergroup • Mixed rocks metamorphosed and deformed by various processes • Important area because of its high gold potential Geology of Scotland Formation of Dalradian Supergroup The Cononish gold deposit History of exploration at Cononish • Discovered in 1984 by Ennex Int. • Exploration 1985-1991, including >15,000 m drilling and 1,280 m underground development • Caledonia Mining Corporation acquisition in 1995, planning granted 1996 • Scotgold acquired 2007, planning granted 2012 and amended 2015 The Cononish gold deposit • Hosted in Upper-Grampian Group to Mid-Appin Group stratigraphy • Cuts stratigraphy at near vertical • Averages 2 m in width • Emplaced at c. 410 Ma • Average elemental abundances Au (10 g/t), Ag (>40 g/t) Pb (0.3%), Cu (0.1%), Zn (0.08%) Little or no As, Bi, Hg, Sb The Cononish gold deposit Ben Lui Trace of Cononish Vein Cononish Mine Vein structure at Cononish Where is the gold at Cononish? • Hosted in quartz (SiO2) • Closely related to sulphides • Pyrite (Fe2S) • Galena (PbS) • Chalcopyrite (CuFeS) • Gold is found with silver as an alloy, electrum • Some native gold Visible gold at the Cononish deposit A B A. Visible gold from Cononish core in hanging wall of vein C D B. Visible gold from surface trenching above Cononish vein C & D. Panned gold from burns around Tyndrum Sub-visible gold at the Cononish deposit The Grampian Project The Grampian Project The Grampian project Near Mine Potential Near Mine Potential.

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OUGS Journal 32
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