Gold Mining and Milling in Western Australia: With Notes Upon Telluride Treatment, Costs, and Mining Practice in Other Fields |
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Common terms and phrases
500-feet level agitation alluvial amalgamation amount appears assay average battery Boulder Main Reef bullion capacity cent charges chlorite coarse concentrates containing Coolgardie cost country rock Cripple Creek cross-cut crushed cyanide December deposits depth diameter diem diorite East estimated extraction field filter-presses formation furnace gallons given Gold Mines Golden Horse-shoe Goldfields granite ground Hannan's hornblende inches Inst iron Ivanhoe Kalgoorlie Kalgurli labour Lake View Lake View Consols lease lime lode machinery main shaft Metallurgy miles mill mineral Mining and Metallurgy Mining Engineers Mining Journal months Murchison North Boulder ore-bodies output oxide oxidised pans Phillips River Pilbarra plant produced pulp pumped pyrites quantity quartz reckoned Report roasting salt sands schists slimes smelted solution South spitzkasten stoping sulphide surface T. A. Rickard tailings telluride tellurium tion Total Trans treatment vats Western Australia whilst width yield zinc
Popular passages
Page 113 - This is, that a series of fissures have been formed without any yawning, gaping, or faulting, up which highly heated mineral solutions were forced which permeated the country rock on each side of these cracks, dissolving out certain of its constituents, and replacing them by others, thus altering the nature of the rock to a large extent near the fissure, and gradually less further and further from it until no alteration at all took place, where the country rock remained in its original form.
Page 14 - Light air 3 2 Light breeze 13 3 Gentle breeze 18 4 Moderate breeze 23 5 Fresh breeze 28 6 Strong breeze 34 7 Moderate gale 40 8 Fresh gale 48 9 Strong gale 56 10 Whole gale 65 II Storm 75 12 Hurricane 0 The above velocities, not being corrected for the errors of anemometer, are probably too large.
Page 72 - the rich area of Kalgoorlie is characterised by a bluish tinge of the rocks, while the rocks of the barren ground surrounding it have a greenish tinge. The local mineralogists have considered the two shades as different alterations of the same rock, and have given the name of diorite to both.
Page 72 - Associated with the veins are lenticular bodies of graphitic slate. These have been called eruptives by some, but Professor Kemp has determined the rock to be a true slate, probably an altered and metamorphosed clay-rock.
Page 72 - Kemp has determined the blue-stone to bo a much altered basic-eruptive, which is now serpentine and chlorite. The green-stone, as determined at Perth, is essentially the same, except that there is a little olivine present. Both rocks are so greatly altered that it is difficult to determine exactly what they were originally, so that there is no conclusive evidence that the blue-stone is, or is not, a later eruptive. "The veins are mineralised bands in a schistose country.
Page 255 - A comparison between melting direct and a preliminary treatment with sulphuric acid gave results depending on the purity of the slimes ; where these had been passed through a 4O-mesh sieve to free them from coarse zinc, melting direct gave a fairly pure bullion and at least as good results as with acid treatment, but with scrap and coarse zinc included the advantage lay with the latter method.
Page 81 - belts along which the crushing effects have been most severe, and the deposition of secondary material more abundant ; " and he appears to regard them, as being, merely, more highly-altered portions of the country rock...
Page 51 - ... and in support of this statement shows that the component parts (1.) have suffered little from attrition, and so have not likely been transported by water. (2.) They are the decomposed products of the surrounding rocks. (3.) They are comparatively unclassified, which is in keeping with the evidence afforded by the material of which they are composed. (4.) "The gold particles, which have rendered the
Page 88 - They vary in colour from grey-green to dark-green, and weather into more or less ferruginous clays. The alteration which the amphibolites would seem to have undergone consists mainly of a conversion of hornblende and felspar, by the action of water and carbonic acid, into chlorite, epidote, and various carbonates, with the separation of free silica. The carbonate of magnesia is readily soluble in carbonated water, so that it is usually found that the more the rock has been affected by carbonic acid,...
Page 21 - In reference to the eruptive rocks, Dr. Chewings maintains " that the Coolgardie Goldfield is the remnant of a large mountain "chain which has been planed down to its roots by denuding " agencies. This chain marks a line of weakness in the earth's