Diamond Drilling for Gold and Other Minerals: A Practical Handbook on the Use of Modern Diamond Core Drills in Prospecting and Exploiting Mineral-bearing Properties, Including Particulars of the Cost of Apparatus and of WorkingC. Lockwood and son, 1900 - 158 páginas |
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Diamond Drilling for Gold and Other Minerals: A Practical Handbook on the ... George Alfred Denny Sin vista previa disponible - 2017 |
Términos y frases comunes
alluvium angle apparatus auriferous average ball bearings banket formation borehole boring bottom boxed with couplings Bullock carat carbons chuck clamp CLINOSTAT coal connection core core-barrel core-lifter corundum cost cutting cylinder depth derrick Diabase diameter diamond drill drill runner drill-hole drill-rods driller drilling-bit drive-rod drum duplex pump engine feed-gear feed-screw feet deep feet per week feet Weight fissure fitted foot frame gear h.p. boiler hand hard rock hardness hoisting hoisting-drum hoisting-plug Hole 13-inch Kafirs Klerksdorp length loosened lower magnet oil-can operation outfit pair patent pipe piston piston-rod position positive-feed pressure Price quartz quartzites reamer reaming reef rock rope rotation safety-clamp screw segregated deposits shaft shipping weights South Africa speed stand-pipe steam steel stones strata strike surface swivel swivel-head threaded thrust Transvaal tube underground prospecting valves vertical water-swivel Weight of drill weights and dimensions wheels whilst wire wire rope
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Página iii - This book is just what was needed to acquaint mining men with the actual working of a process which is not only the ir.ost popular, but is, as a general rule, the most successful for the extraction of gold from tailings." — Mining Journal. DIAMOND DRILLING FOR GOLD & OTHER MINERALS. A Practical Handbook on the Use of Modern Diamond Core Drills in Prospecting and Exploiting Mineral.Bearing Properties, including Particulars of the Costs of Apparatus and Working. By GA DENNY, MNE Inst.
Página 97 - MT, d the difference of the depths of the boreholes M and H, and d' the difference of the depths of M and T. "For example, let HT = 150 yards, KM = 112 yards, and MT = 100 yards, measured horizontally. Let the angle MHT = 41° 48...
Página 97 - M is 32 yards, and in the bore-hole H 73 yards higher than in the bore-hole T. It is required to determine the strike and dip of the seam, when TH courses 172° 30'.
Página 96 - N) (2.) From this, the angles T and N are found, as half their sum is known. From the given strike HT and the angle T, the strike of the line TN may be deduced. In order to determine the dip of the deposit, imagine a line HO drawn from H perpendicular to the line of strike TN, then TT Q in the right-angled triangle HOT, -=_-= = sin T, whence it follows that HO = HT sin T.
Página 77 - At the lower end it terminates in a short neck and bulb, within which a magnetic needle is so held by a glass float as to stand upright upon its pivot in every position of the phial, and thus allow the needle to assume the meridian freely without touching the sides of the bulb. Passed through an air-tight cork and screw capsule at the upper end is a small glass tube, terminating in another bulb above, and with its ^ open lower end inserted in a cork which enters the lower neck of the phial, thus...
Página 77 - ... the specific gravity of the gelatine in which it is immersed, so as to insure the rod being truly vertical whatever the position of the phial and bulb may be. When the gelatine is fluid the plummet hangs freely perpendicular, whilst the needle in the lower bulb assumes the magnetic meridian. When, however, the phial is at rest in any position, the contents solidify on cooling, and thus hold fast the indicating plummet and magnet in solid transparent material. On withdrawal from the bore-hole...
Página 78 - On withdrawal from the bore-hole the phials can each be replaced at the same angle at which they cooled, and when the phial is revolved upon the part where the magnetic-needle is seen embedded in the gelatine, until the needle is again in the meridian, the phial is manifestly in the same direction, both as regards inclination and azimuth, as it was when its contents were congealed, and thus the gradient and bearings of the bore-hole can * Engineering, voL xxxix., 1885, pp.
Página 79 - ME, vol. xxix., p. 61. instrument employed, the amount of deviation is etched upoa glass by hydrofluoric acid ; whilst its direction is found by means, of a compass-needle, clamped by the aid of a stop-watch, after sufficient time has been allowed for settling. Notwithstanding the great imperfections of this instrument, its use in Germany has revealed some startling deviations of bore-holes. For example, in a bore-hole at Dienslaken, bored with a rotating drill, the deflection amounted to 47° at...
Página 3 - The requirements of a diamond drilling machine are many and exacting. It must be strong, simple and durable, economical in the use of steam and in the wear of...
Página 32 - When in operation, water is pumped into the cylinder through the tee D. When the valves 1 and 3 are open, and 2 and 4 are closed, the water pressure is above the piston, and its downward motion is regulated by the manipulation of a valve on the escape tee E. Similarly, if the valves 2 and 4 be open, and 1 and 3 be closed, the water pressure is below the piston, which consequently moves upward, the stroke of the piston being necessarily the continuous effective " feed