Bulletin (Geological Survey of Western Australia). |
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30 feet albite alluvial alluvium appears assay average belt Black Range Blackwood River body Bonnievale bottom Bunbury Gully carried cassiterite cement chains conglomerate considerable consists Coolgardie copper country rock crosscut crushed deep lead dipping distance district Dumpling Gully east extends fairly feet in thickness feet level ferruginous flat foliated Geological Geologist Gold therefrom Greenbushes greenstone ground hematite hematite quartz lodes ilmenite ironstone irregular Jourdie junction kaolin laterite length lode low grade Main Reef main shaft Maninga Marley mica micaceous miles mineral Mines Name and Number north and south Number of Lease Nungarra outcrop owing oxide pegmatite probably prospecting quantity quartz reefs Rate recent deposits rich sample sand Sandstone schist schistose showing the Yield small quartz Spring Gully stanniferous stibiotantalite stockworks stone stoped sunk surface Table showing tantalite tantalum three feet tin-bearing Tons Total tourmaline values Wanderie wash water level weathered whilst width
Popular passages
Page 20 - ... Before dealing with purely Australian deposits, it will be well to go briefly into the general features of the question. These two metals are nowhere found in the native state, nor in sulphide or other similar minerals, but exist always in combination with oxygen and one or more other metals, the oxides having an acid character and giving rise to tantalates and niobates. They invariably occur in conjunction, replacing one another isomorphously to a very variable extent, the niobate of a metal...
Page 52 - Bridgetown, upon what was originally ML 82/76. A shaft has been put down to a shallow depth upon a tourmaline-bearing dyke, which was met with beneath the conglomerate at a depth of about five feet below the surface. The conglomerate contains detrital tourmaline, which led to the discovery of the dyke. As exposed in the workings, the width of the dyke is about two feet six inches, having a general...
Page 37 - The sand-rock may be described "as a coarse incompletely consolidated sandstone or grit, consist "ing mainly of iron-stained particles of quartz loosely cemented. " The cement has a bluish grey tinge, owing to the play of light on the '' quartz fragments. This too is not quite compacted, since fractures " through the material do not break across the pebbles, which are " harder than the clay binding them together. In this respect the "cement differs, for example, from the South African 'Banket' to...
Page 112 - ... a trend of about 5 degrees east of north, thus crossing the first vein at an acute angle. The trend of the second vein is marked by considerable quartz debris, while the first has very little in the way of surface outcrop. Little is known as to the strength of mineralization in the second vein. One shaft has been put down on it to a depth of about 80 feet, and it is reported that it produced shipping ore. This shaft was partially caved and filled with water at the time of the field work for this...
Page 45 - Gully, not far from its head, another well-marked "tin floor" has been worked at a depth of about 30 feet from the surface. The " floor " underlies at a low angle to the West. The material forming the floor, locallv...
Page 36 - ... which in turn gives place to the gold-bearing cement, which has an average thickness of 2£ feet. The last lies directly upon an irregular surface of decomposed granite. The several layers composing the deposit are separated by seams of pipe-clay, which, like the...
Page 76 - ... and pyrite. A little zinc blende was also found at a depth of about 200 feet. (At the Nangeroo Mine at Murrin Murrin, about 4 miles north-east of the Anaconda, sulphide ore begins at a vertical depth of about 80 feet and in patches is very rich in zinc blende.) In No. 3 level at a depth of...
Page 14 - In addition to this a large amount of work has been done on two other lines of reef known respectively as the South Reef and the Tunnel Reef.
Page 46 - ... have been released from the parent rock in close proximity to where it is at present found. No small portion of it has been derived from the denudation of the granite belt, reticulated with tin-bearing veins, which crosses Spring Gully from North to South. An older alluvium is exposed in what is known as Elliot's Gully, a, tributary of the...