... Charlotte, 2669 + or - 17 Ma at Mount Percy, 2663 + or - 3 Ma at Racetrack, and 2657 + or - 8 Ma at Porphyry. All these ages are consistent with gold mineralization at ca. 2640 to 2630 Ma.Intermediate to felsic dikes cut typical syn- to postmetamorphic lode gold mineralization at the Mount McClure...

... cordially express his appreciation. He wishes in particular to express his thanks and appreciation to Mr. Percy G. Morgan, government geologist, for revising the columnar sections herein included, bringing them into accordance with the nomenclature, etc., accepted by the New Zealand Geological Survey. 2...

... , Perth , 53 pp. SAUTER , P. C. C. , HYLAND , S. J. & BRADLEY , T. 1988 . The Mount Percy gold mine . In : Groves , D.I , Barley , M.E , Ho , S.E , Hopkins , & G.M.F. (eds). Western Australian Gold Deposits . Bicentennial Gold 88 Excursion Guidebook...

... Distribution of Rb/Al in the acid-insoluble residue of surface rocks, Rosebery mine area. Note absence of Rb-enrichment along the Mount Black Fault. The Rosebery deposit is also associated with a significant zonality along the dip of the host rock. This lateral zonality is defined from the upper level...

... (~160 t Au produced), Mt. Percy (~8 t Au produced), and lower Hidden Secret (~1.4 t Au resource) orebodies ( Mueller, 2015 , 2020a; McDivitt et al., 2020 ). The deposits are aligned along a north-northwest trend within mafic to ultramafic rocks of the Kambalda Sequence that have been intruded by mafic...

..., Mount Charlotte remains the only stockwork in the Kalgoorlie gold field with significant gold production ( Clout et al., 1990 ). Vein stockworks at other deposits, such as Mount Percy, as well as Idaho, Off Chance, and Bonnie Lass, typically have composite gold mineralized zones where quartz vein...

... but typifies the Mount Charlotte and Mount Percy deposits, a few kilometers to the north. This style of mineralization is characterized by strictly dilational quartz vein swarms which clearly crosscut Fimiston-style lodes (e.g., Ridley and Mengler, 2000 ; Bateman et al., 2001 ). In the Mount Charlotte...

... consolidated gold mines mapping and compilation. The location of the Gidji Lake Unconformity is from G.I. Tripp (pers. commun., 25/07/2019). Gold deposits of the Kalgoorlie gold camp (the Golden Mile, Mt. Charlotte, Hidden Secret, and Mt. Percy deposits) as well as the Oroya shoot are shown as yellow dots...

..., such as the Ossipee Mountains, Belknap Mountains, Copple Crown, Percy area, Starr King area, and the main White Mountains batholith, are remarkably similar. The smaller complexes, notably Red Hill,9 Mount Tripyramid,1° and Pleasant Mountain,~ have each their own petro- graphic and chemical peculiarities, suggesting...

... deposits of that age occur ( Cornell Register 1901–1902, p. 177). Harris was Geologist-in-Charge of the Louisiana Geological Survey at that time ( Cornell Register 1902–1903, p. 185). See also Brice (2004b) . 25 Arthur Veatch (1878–1938) and Percy Raymond (1879–1952) were students of Harris...

..., 1997/2 Pillans , B. & Bateman , R. 2000 . Paleomagnetic dating of Phanerozoic weathering imprints, Mount Percy Mine, Kalgoorlie, Western Australia . Geological Society of Australia Abstracts No. 59, 15th Australian Geological Convention, Sydney, July 2000. pp. 390...

... that, on existing evidence, the presence of large gold deposits was unlikely. 9 When shown his error, McCoy argued that, ironically, the best place to learn about the Earth and its treasures was the mineral museum and the classroom. 10 In evidence to the Victorian Select Committee on Gold in 1856, McCoy said...

... with other New Zealand K-Pg boundary sections, A. mcmillanii sp. nov. and C. fairfieldensis sp. nov. seem to have a palaeoenvironmental affinity for shallow marine to inner neritic depositional environments. * Email: [email protected] / [email protected] © 2012 American Association...

...Richard J. Howarth ABSTRACT Progress in measurement of the force of gravity and its contribution to the understanding of geology, and to exploration for oil and mineral deposits, from the eighteenth to the early twentieth century is reviewed. Initially, work focused on determination of the mean...

... bacteria produce Mn-rich deposits on rocks in such varied environments as mountain soils (Khak-mun 1966 , 1968 ), acid mine drainage (Tebo et al. 2005 ), and caves (Northrup et al. 2003 ; Lozano and Rossi 2012 ). Culturing studies indicate the presence of budding bacteria Pedomicrobium sp...

... of sediments deposited by the river Arve under the foundations of the future Grand Théâtre ( Colladon 1893 ). Brun published his first optical analysis of minerals in 1891, studying the optical constants of synthetic opals ( Brun 1891 ). He went on to make many optical studies of the rocks and minerals...

...Kevin J. Edwards; Pia Östensson Abstract In 1937, the Swedish palynologist Gunnar Erdtman (1897–1973) mounted two adapted vacuum cleaners atop an ocean-going liner and set out to obtain air samples as he crossed the Atlantic Ocean. The devices were able to capture samples of airborne pollen which...

... lodes. In addition, a few specimens were obtained away from the “Super Pit” at the Mount Charlotte, Abedare, Mount Ferrum, Oratava, Mount Percy and Hannans North deposits for comparative purposes. Polished thin sections were made from 267 of the samples collected and optically examined using...

... establish their ages as late middle Miocene near Carmel and early late Miocene at Mission Viejo. The foraminifera indicate deposition occurred at bathyal depths. Surrounding strata are fine-grained, thin bedded and lack heavy bioturbation, features typical of the siliceous facies of the upper Monterey...

... coinciding with glaciation and crustal rebound: An early Holocene rhyolitic eruption in the Dyngjufjöll volcanic centre and the formation of the Askja caldera, north Iceland— Guðmundur E. Sigvaldason 192 A conceptual model of the Mount Spurr magmatic system from seismic and geochemical observations...