By D.S. PARASNIS (Eds.)
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Cm3) Locality Biown iron ore Haematite Haematite Magnetite ore Magnetite ore Magnetite ore Chromite ore Iron ore 80-140 528 337-785 5,700-7,700 240,000-490,000 1,000,000-1,130,000 600-94,000 52,000-122,000 Haussmannite Jacobsite Pyrite ore Pyrrhotite 132 ca. A. Lângban, Sweden India Kankberg, Sweden Kankberg, Sweden Observer NEUMANN (1932) WERNER (1945) WERNER (1945) NEUMANN (1932) WERNER (1945) WERNER (1945) HAWKES (1951) MOONEY and BLEIFUSS (1953) WERNER (1945) Remarks haematite rich, very low magn.
By appropriately stretching or contracting the vertical and horizontal scales, such "master" curves can therefore be readily brought into a size suitable for comparison with an observed anomaly curve. When the true distances are plotted against the measured anomaly, we find that the anomaly curve becomes broader as the depth of the ore increases. On the other hand, shallow ores show sharp anomaly curves. 39 AN OREBODY AS A MAGNET As the depth extent of the orebody increases, the influence of the lower pole decreases so that the ΔΖ-anomaly falls off less rapidly from its maximum value.
MEASUREMENT OF SUSCEPTIBILITY AND REMANENCE The accurate determination of the susceptibility and remanence of rock samples has been discussed in great detail by several authors (PUZICHA, 1942; MOONEY, 1952; MOONEY and BLEIFUSS, 1953; 1945). Naturally, it requires recourse to special experimental arrangements. Rough determinations of the susceptibility and remanence can, however, be made relatively easily with a vertical field magnetometer by the simple procedure described in Appendix 1. WERNER, THE GEOMAGNETIC FIELD As the magnetic method of prospecting depends on detecting the deviations (anomalies) in the earth's field, it is necessary to have an idea of the normal character of this field.