Version 1.0 rev 121 -: 1 :- Version saved: 03 Nov 2017 at 17:24:00 An Account of the Mineralogy of Foggintor Quarry, Dartmoor, Devon. Alysson Rowan Devon, UK alyssonrowan@gmail.com https://independentscholar.academia.edu/AlyssonRowan Fig. 1. Aerial photograph of Foggintor Quarries, the dumps and the remains of the tramway past Yellowmeade Farm, looking northward. Abstract— The extensive quarry site at Foggin Tor has long lacked the study applied to the larger quarry at Merrivale. This study, carried out over a number of visits is intended to begin to rectify this, and to highlight the range of minerals found here. Keywords— Dartmoor Granite, Granite geology, Historic quarry, Uranium mineralisation I. INTRODUCTION Foggintor Quarry [SX 566735] in the heart of the Dartmoor countryside, abandoned since the early 1900's, was the source for the shaft of Nelson's Column and parts of the New London Bridge. There is relatively little geological documentation relating to the quarry, and it remains largely unregarded by mineralogists and geologists, whose attention has traditionally been focused largely on the nearby Merrivale Quarry [SX 546753] although it is a popular destination for climbers, wild swimmers and walkers alike. The site, easily accessed from the main road, comprises the quarry itself, a small, abandoned settlement which once boasted its own chapel, and an extensive series of finger dumps. The quarry was served at various times by cart track, horse-drawn tramway and its own branch of the Yelverton to Princetown Railway. The quarry is made up of the following: • The northern portal is a small bay representing, possibly, the original working. • The north bay is a large working which is in part flooded to considerable depth. • The south bay, another large working, although not as deep as the north bay, provides overflow drainage of the entire quarry through the south portal. The lower parts of this section do flood and are often treacherously boggy. • The south portal. This 'roofless tunnel' through the flank of the hill was driven to support a tramway and to allow drainage of the quarry. It can become impassable when water levels are high. The dumps comprise a northern finger dump ('Big Tip') and two lesser sets of radiating heaps, the southern dumps. The north-most of these relate to waste drawn from the north