At the present time our understanding of rock behaviour under mining conditions is largely empirical. Limitations in this approach have been recognized and laboratory testing is gradually being introduced as another source of information. An adequate correlation of laboratory test results with field conditions has not been established but test results are being published, as in the report on mining practices at Elliot Lake (1)*, on the basis of their comparative value. This study aims at establishing some of the physical properties of an andesite rock by conducting tests on specimens cut from diamond drill core. The results may be useful for comparison with other rock types and for relating laboratory test results to rock behaviour under mining conditions.

The scientific principle considered in this thesis is the relation at the surface of the earth, of the amplitude, phase and frequency of orthogonal components of the naturally occurring electric and magnetic field fluctuation to the resistivity profile of the subsurface geology. A method of resistivity profiling, known as magnetotellurics, was presented in a paper by Cagniard, (1953) and extended in later papers by Wait, (1954) Tikhonov and Shakhsuvarov (1956), Cantwell and Madden (1960), Smith, Provazek and Bostick, (1961), Price, (1962), Vozoff, Hasegawa and Ellis (1963) and others. Results obtained by these researchers have shown that the basic theory of magnetotelluric methods require some modification for extension beyond very simple geologic situations.

Missing pages. / This thesis is in the area of engineering theory. It is concerned with the combining of existing scientific theories into a rational hypothesis for predicting the loading of pillars. Hitherto, this has only been possible in a very crude way and only for horizontal workings. Analytical work to predict pillar loadings for long mining zones in elastic ground produces equations which include, in the form of dimensionless parameters, the significant geometrical and material-properties affecting pillar loading. Additional analytical work demonstrates that various arching and plastic theories are unlikely to be of any use in this problem. [...]

The St. Lawrence Lowlands refers to the area adjacent to the St. Lawrence and Ottawa Rivers. It is bounded on the northwest by the hilly region of the Canadian Shield and on the south-east by the Appalachian Uplift. To the south-west the plain is limited by the connection between the Canadian Shield and the Adirondacks just below Lake Ontario - see Figure 1. [...]

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Problems of Rock Mechanics related to mines are usually concerned with stress distributions and the properties of the rock mass surrounding mine excavations. Neither aspect at present can be reduced to absolute values. Stress distribution in mines is being studied mathematically, photoelastically through various types of models, and also by measurements in situ. [...]

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