Palaeontological Contributions to the Geology of Western Australia: I. Descriptions of Carboniferous Fossils from the Gascoyne District, Western AustraliaW.A. Watson, government printer, 1898 - 41 Seiten |
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Palæontological Contributions to the Geology of Western Australia ... R. Etheridge Keine Leseprobe verfügbar - 2015 |
Palæontological Contributions to the Geology of Western Australia ... R. Etheridge Keine Leseprobe verfügbar - 2017 |
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30th June 50 feet angle appears auriferous Average oz belt boundary chains chutes cicatrix considerable consists Coolgardie costæ country rock Crinoid crosscut crushed Davyhurst decomposed dendroidea deposits diabase diorite distance district dollied and specimens drive dykes Edjudina feet in width feet level felsite foliated Foord Gabanintha Geol Geological Survey Gold Returns Gold therefrom GOLD YIELD Government Geologist granite greenstone greenstone schists hematite hornblende inches iron ironstone irregular Lake Austin laterite lease Leonora line of reef lode main reef main shaft Mainland Meekatharra miles mining centre Mount Mulline Mulwarrie Murchison Goldfield Nannine north and south North Coolgardie north-east north-west outcrop parallel Perth Plate pyrites quartz reef quartzite quartzite bar Rate reef runs rich ridges Riverina rock schistose schists showing Sons of Gwalia SOUTH G.M.L. Spirifera stone stoping sunk surface thickness tons Tuckanarra Ularring underlie vertical shaft water level Western Australia レレ
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Seite 52 - O, 13.43 Fe, O, 2.57 Fe O 2.57 Ca O 2.29 Mg O 1.03 K, O 1.58 Na,O 3.85 Mn O Trace H, O 72 101.13 The sample analyzed contained small percentages of CO2, sulphur, and zirconium, none of which were quantitatively determined in the analysis. This analysis shows a high percentage of silica and a relatively low percentage of iron, both of which indicate a durable stone. Physical Tests. — The specific gravity of the Utley rhyolite was determined to be 2.645, and the porosity .019 of 1$, which is the...
Seite 36 - Erawandoo form the most prominent summits, is remarkably prolific in iron-bearing schists. The summit of Mount Hale is formed of contorted quartz schists, with bands of hematite, which occur in lenticular masses ; some bands are often as thin as a sheet of paper, whilst others widen out to considerable dimensions. One band measured 70 feet across and outcropped for over a quarter of a mile, but varied in thickness in different parts. There were similar bands parallel to it and equally persistent...
Seite 44 - ... four to eight feet in thickness and is overlain by from ten to twenty feet of muck. The terrace-gravels consist of the same materials as the stream-gravels but are rounder and more worn. Quartz pebbles also seemed to be rather more abundant. The yield from Eureka Creek has so far been small, and at the time of my visit very little work was being done. A few prospecting shafts were being sunk, and at No. 17 above Discovery, a crew of miners were engaged in sluicing with satisfactory results. The...
Seite 24 - ... the same sub-parallel structure of the albite as was noted at Amari. The country-rock, which is a biotite gneiss, is quite unaltered and the junction of the dyke with the gneiss is particularly sharp, the dyke showing a distinct tendency to become finer in grain, c 33 ABU, No. 4. This dyke, in which a shaft has been sunk to a depth of about 50 feet, is nearly vertical, striking north and south. Its dimensions are small. The rock found at the outcrop and in the bottom of the shaft is identical,...
Seite 4 - On a second lode, a couple of chains farther east, a shaft has been sunk to a depth of 100 feet, and a winze put down a further distance of 30 feet.
Seite 36 - ... of common iron, for use as a mixture to impart the property of cold toughness to other iron, or for making an iron to be mixed with other irons that are not quite up to requirements for boiler plates, for blooms, or for an extra good iron generally, these ores are most valuable.
Seite 31 - I have never doubted but that they would ultimately bee me a main source of its advancement. All the different kinds of auriferous quartz known in other colonies are found abundantly in various parts of this — the question of payable gold is, as I have long since reported, simply a question of time.
Seite 29 - Bounded by lint s starting from the summit of Mount Murchison, and extending north-eastward to the summit of Mount Hale; thence eastsouth-eastward to the summit of Mount Russell ; thence south-westward to the north-west corner of the Yilgarn Goldfield...
Seite 22 - The Mines. The following is a brief description of the principal mines working in the district at the time of my visit : — ARCHIBALD QC 47.