Bulletin, Nummers 1-10Geological Survey of Western Australia, 1898 |
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amphibolite assay auriferous Authority bands beds bore Boulder carbonates Carboniferous cement cent chains chlorite clay Collie Colony conglomerate consist Coolgardie Coolgardie G.F. Coolgardie Goldfield copper country rock Creek crosscut Department of Mines diorite distance District dwts dykes East feet level felsite felspar ferruginous foliated formation G.F. Perth Geological Map Geological Survey Gold Mining Lease Gold therefrom Goldfield Government Geologist granite gravel H. P. Woodward hornblende inches iron ironstone Irwin River Kalgoorlie Kanowna Kimberley Lake limestone lode main shaft mica miles mineral Murchison Nature of Strata North and South North-East North-West obsidianite occur outcrop oxide Peak Hill Perth Phillips River Pilbarra porphyritic portion Previous to 1897 pyrites quantities quartz quartz reefs quartzites Range reef Report River sand sandstone schists seam shale Silica specimens surface thence thickness Total Ore crushed Trace underlie veins vertical depth West Western Australia Wongan Hills
Populaire passages
Pagina 8 - Illustrations of Comparative Anatomy, Vertebrate and Invertebrate, for the Use of Students in the Museum of Zoology and Comparative Anatomy. Second Edition. Demy 8vo. cloth, is. 6d. A Catalogue of Australian Fossils (including Tasmania and the Island of Timor), by R.
Pagina 79 - At the date of my visit the old workings, which had opened up a large quartz reef, had been abandoned, and a fresh start made by a party of miners " on tribute," who recommenced work in an " open cut " on the auriferous felsite dyke running parallel to the reef.
Pagina 46 - ... slope to the flat, one may notice somewhat regular lines of round boulders and pebbles roughly marking the outcrops of the conglomerate beds. By these indications, and also by following up the runs of alluvial gold until they stopped all along certain horizontal lines, the auriferous conglomerates were originally located and worked by prospectors by means of drifts and tunnels.
Pagina 75 - As a general rule the ore deposits have no well-defined walls, but seem to pass insensibly into the surrounding rock. The lodes are often traversed by a network of quartz veins, which ramify in all directions. There is abundant evidence attesting the fact that the rocks have been subjected to profound dynamic phenomena, which has resulted in the production of lines of weakness along which mineral-bearing solutions have found a comparatively easy passage.
Pagina 29 - ... the older rocks outcrop. As a rule these strata are horizontal, although in some cases a slight undulating dip is perceptible. The interstratified beds of white, yellow, and sometimes ferruginous limestone, attaining the thickness of 30 feet, which occur chiefly in the neighbourhood of Champion Bay, do not seem to be persistent, but are found, as it were, in patches, which gradually thin out. As the limestone composing them is made up of shells, which in some cases have consolidated into a solid...
Pagina 21 - ... group of rocks are more largely developed in this Colony than in any other portion of the world, outcropping as they do in all parts of the country, and where they are overlain by more modern formations these latter are rarely of any great thickness. This series is highly contorted, being folded into a number of parallel anticlinal and synclinal folds, striking North and South, and often presenting the appearance of a highly inclined dip, which is either nearly vertical or trending to the Eastward....
Pagina 22 - ... met with most abundantly from North to South. They vary immensely in colour, structure, and external character, some at first glance having the appearance of clay-slate, but on being fractured they exhibit a structure similar to diorite, whilst others again only contain green crystals of hornblende disseminated through a quartz matrix, or have a jade-like appearance, which latter variety are continually, being mistaken for copper, nickel, or silver. With these rocks are associated the principal...
Pagina 28 - Gregory says these beds : — Are almost exclusively siliceous in character, containing only a few beds of chalk of very inferior quality. They abound, however, more in fossils than the Carboniferous do, and with the exception of the recent coast limestone, more so than any other formation. Flints are rarely found in these. The bed of the Greenough River is the best spot for procuring specimens, although a few are found in the Chalk Hills near Gingin (spines of Echinoderms, etc.).
Pagina 116 - ... horizontally-bedded Tertiary sandstones, which often present towards the plains vertical cliff faces of as much as 200 feet, particularly where streams have cut deep channels through them ; whilst to the westward it is bounded by more high sandy plains which extend as far as the coast. Of these boundaries that to the south and east may be taken as the definite edges of the carboniferous formation, but that to the north and west only as provisional, since the sandstones which form the high sand...
Pagina 29 - Rhynchonellidx, etc. These fossils are generally found in the limestone, whole masses of rock being composed of them ; they are also found in the hard ferruginous shale and sandstone, in which case they have been converted into oxide of iron. In a paper published in the proceedings of the Geological Society, the author, Mr. C. Moore, considers the fossils from these beds to represent the fossil fauna of the Lias and the Lower Oolitic formations of England. The whole chalky limestone of Gingin...