Transactions of the Institution of Mining and Metallurgy, Volume 7E. & F.N. Spon, Limited; The Institution, 1899 |
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alluvial amalgam amount antimony argillite assay value augite auriferous average basalt battery beds buddles bullion calciners carried cent charcoal charge Claudet coarse Company concentrates contained copper cost country rock cyanide process cyanide solution deep leads deposits depth diorite district Dolcoath dry crushing engine experiments extraction faults felspar figures filter furnace galena gangue gold grade Huanuni inch iron labour less lode loss method mica miles mill mines obtained occur ordinary Oruro output oxide palladium pan amalgamation paper passed pegmatite percentage plant porphyry precipitation present pulp pyrites quantity quartz R. A. F. Murray Rand reef regard remarks rich rock schists screen serpentine shaft siderite silver slimes Slocan smelting South stamps stoping stuff sulphide surface tailings tellurium tetrahedrite thought tion tons treated treatment vanadium vats vein vertical wall wash Western Australia wet crushing width zinc
Popular passages
Page 231 - Iron and copper pyrites are but slightly altered by the copper solutions. In practical operations at the mill they are found in the tailings without showing any appreciable signs of having been attacked. It will...
Page 1 - Society was held at the Dr. Savage Institute, New York, on December isth, 1900, Mr. J. Blake Hillyer, president, in the chair. The minutes of the last meeting having been read and confirmed, the...
Page 13 - ... appears to be quickly giving place in depth to tin. The mines now being worked by the Pahang Corporation were, so report says, continuously worked by Malays and Chinese for more than 100 years, the large surface excavations made by them, some of which are 1,000 feet long, 200 feet wide, and 150 feet deep, testifying to this being a fact. The open-cast system was the only one adopted by the old miners, and as timber was seldom made use of to secure loose ground, the sides of their working were...
Page 13 - The open-cast system was the only one adopted by the old miners . . . the sides of their working were sloped or terraced to keep them from falling in. This, and not the thickness of the lodes, accounts in many instances for the great width of the old workings. . . . Explosives of any description were never made use of, owing to a strange superstition firmly believed in by the Chinese, viz., that the use of explosives frightens away the metal in a mine. In consequence of this, any very hard ground...
Page 130 - The time given to this treatment would be 66 to 70 hours. The solutions were not allowed to stand, but were drained off when the tank was once filled. The object of this was to allow fresh air to obtain access to the mass of damp sand. Each solution would be about 27 tons to the tank of ore (165 to 170 tons). The ore was then transferred to the second row of tanks, having lost about 67 per cent.
Page 26 - THE minutes of the previous meeting having been read and confirmed, the President referred to the intimation that Mr.
Page 241 - This lode dips to the north-east at an angle of about 65°, though in 'some places it is nearly vertical. The hornblendic felsite forms the footwall and the serpentine the hanging wall. In the felsite, at varying distances along the lode, are, quartz veins, from a few inches to 6 feet thick, coming in from the west and abutting against the lode which they appear to follow down, and form irregular quartz pipes or shoots dipping diagonally along the lode towards the cast.
Page 201 - COLLEGE, President, in the chair. The SECRETARY having read the minutes of the last meeting, the President announced that the Treasurer, the two Secretaries, and the Librarian of the past year, had been re-elected to their respective offices. Also that Mr. Argles, of Balliol College, had been elected on the Committee to fill the vacancy caused by Mr. Medd having accepted the office...
Page 130 - ... treatment). A water wash of 20 or 30 tons completed this part of the process, which would last some 275 hours. A careful series of moisture tests and measurements of solution sumps during the treatment of four tanks (680 tons) showed that the total loss of liquid in the treatment was 96 tons, or 24 tons per tank. The moisture in the discharged residues averaged 12-3 per cent., or, say, 20 tons per tank ; the remaining 4 tons would be represented by evaporation from surfaces of sumps and tanks...
Page 208 - Stevenson, president, in the chair. The minutes of the previous meeting having been read and confirmed, Mr.