Captain Andrews (1827) mentions the lavaderos (alluvial gold-wash-. Compressed condition, may possibly have a thickness of 4000 to 5000 ft. They are constructed of strong boards, well joined together (strong sheet-iron may be employed also). Ballarat; such dykes, sometimes of great size, traverse the Lower Silurian. Him to be Lower Palaeozoic in age.
Of boulder clay beneath the beds of the present water-courses, which. The mine is a longitudinal excavation following the course of the. It is scarcely likely that the whole district, comprising several hundred. Development to a vast extent. Worked to advantage are those irregular veins showing no defined casings, and the latter much disturbed, and leaving spaces which are filled up with. Tree saturated with gold, 757, 769, 797. Oo oo oo a\ t^ioo oo oocooooooooooo o\oo oo oo oo oo oo a\ o\oo oo oo oo o. A single head, to crush 12 to 15 tons per 24 hours, costs. Worked extensively among the low hills of San Simon on the river Itenez; and an. The ore was first pounded under stamps, then amalga-. This was the first important discovery of gold. Shaou-chow-foo, 298. CHARTERS TOWERS, INSIDE REEFS. As already mentioned, free gold was found in the quartz at the.
Honduras, and parallel to and distant from the coast as the crow flies. But in a porphyritic mountain at La Candelaria, near Guarisamey, pure compact gold is found both in laminae and disseminated in quartz. HAYDEN (F. Colorado and Portions of Adjacent Territories: Geological. Made openings upon other lodes and branches. Pulleys and driving-belts, the spindles and arms are revolved in reverse.
Government discovered the region whence so much gold found its way to. At work, crushing about 15, 000 tons. Encountered a quartz reef projecting 20 ft. above the ridge (3100 ft), and 10 to 12 ft. wide, running through a sandstone formation in a. direction N. ; it was full of iron pyrites, which revealed gold. Travels in Western China and Eastern Thibet. Press to remove the acid, melted, and refined. Silurian, since the Potsdam sandstone which abuts against the Archean.
Iron (of which large quantities are consumed in tools for working the. Drift lying on the bed-rock; in many places, false bottoms occur. Dutch box-sluice, 863. For dividing the stream when the sluice is a large one. Miles, containing 140 mines already (1878) developed, and that their.
Much higher, and have since been worn away by the elements. He could not approach the place; but the gold was offered him for sale in the shape of pills of clay, full of. Work at the mines instead of paying a capitation tax, estimated to. And that the mines sometimes returned to the Turkish Government a. monthly profit of 30, 000 ducats of gold. Crushings, the first (20 tons) giving i oz. Is generally very rich. Beaver Head co., 172-3.
Of Camante; but their expedition led to no practical results. Apiece; but, even then, most of the gold consisted, and now the whole consists, of scales and granules of merely a few gr. Have been obtained of crystallized gold. The principal problem at present is to drain the mines, and put them. BALFOUR (Edward).. BALL(V. ). ' >* >> +1 >> > S bio. Machines ceased, and the cost of labour was reduced by one half. These rivers traverse rocks of the. Only interesting to science, but of considerable practical importance.
The gold-mine to the S. towards Kokaran, including the Murghan. — Runs N., nearly parallel to Williams' Creek, and. And elsewhere to them, constitute one of the more interesting and. The working of veins, since the Spanish rule, has almost been aban-. — dies, 1009. dimensions, 1019. duty, 1019. false bottoms, 1009. feeding, 1017-8. foundations, 1002-3. frames, 1003-4. gratings, 1006-9. guides, 1013-4. Foord, the well-known chemist and metallurgist of. Guita, 109. de la Milpillas, El Potrero, 109 [109. As regards Ulrich's own experience touching this rock, he.
Decomposed rocks and veins. — The working of Perry's elevator, which has already. He has another implement for testing the quality. And the detritus washed. Deep in the granite. Talcose unctuous clay.
50 ft. along the line of reef, with a breadth of 100 yd. Now " recognized as hornblende or mica andesites, or quartz-andesites. Sediments of various rock formations. In 1861, passes diagonally through the valley of Papigochi, from N. to. Account of evaporation. The confluence of the Loangwa with the Zambesi, west of Tete, are the. Severance deserves success. Fine gold may generally be found on washing a few dishes of the surface.
The common pan was tried, but the gravel, though. Bank with sufficient force. The stream, and the various strands of the mat being opened and loosened. Madman's gully, 557. The Malay chiefs, who levy it in person every 2 months, and in. For 20 years was 6 miles long, 16 ft. wide, and. Uncertainty; but there can be no doubt that the two regions are contem-. D'Osery thought that originally. As soon as the calcination. 37 2 GEOGRAPHICAL DISTRIBUTION. White Rock Canon, south-west side. Bourke's reef, although it has proved highly auriferous at a shallower level than the. Annexed are similar details concerning parcels of quartz:-.
Immediately upon a layer of finely-broken quartz, at least 3 in. Gold in the secondary pyrites coating the joints and filling. Catching the gold; sometimes therefore the grade of the last part of the. Had been found in such a large proportion in the copper brought there. Rise at an elevation of 1250 ft. above sea-level, and have been traced. The process is applicable to all ores of copper, but sulphuretted ores. Conditions of this force and the resistance offered to its action, that the.