A COMPARATIVE STUDY FOR STRENGTH CLASSIFICATION
The importance of providing a system for strength classification is emphasized by the diversity of testing methods, number of representative samples needed, and testing equipment required. In the present work three Egyptian types of rocks: Limestone, Sandstone and Granite with different specimen sizes are used to carry out a comparative study concerning the determination of the compressive strength using uniaxial compression, point-load, and Schmidt hammer techniques. Testing results are statistically analyzed and correlated with some physical properties like porosity, density and sound velocity. * Associate Professor, Mining Department, Faculty of Engineering, Cario University TÜRKİYE X I I I . M A D E N C İ L İ K K O N G R E S İ , 1 9 9 3
The potential for cast blasting in Canadian surface mines
ABSTRACT The use of explosives to cast overburden has increased rapidly during the 1980' S. Several coal mines and quarries worldwide utilize blast casting to mine higher strip ratio pits or to improve the economics of mining existing pits. It is visualized that blast casting methods have the potential for successful application to some Canadian coal mines. This paper reviews the existing global technology in this field and identifies the situations where its use in Canadian mines could contribute to lowering the overall cost of overburden handling.
Principles and applications of displacing overburden in strip mines by explosives casting
All the explosives casting work performed by the authors to date has proved that it is possible to cast large quantities of material and substantially increase the quantity of coal uncovered per unit of time. In addition, the quantity of cast over can be controlled through the burden/(energy) /SUP 1/3/ ratio, tie-in orientation and cut depth to width ratio in order to meet the operating requirements of a given property. The authors recommend that a program to institute and optimize explosives casting at any mine include the monitoring of a series of blasts using the high speed camera. This device provides one with the only record of the blasting event from which accurate measurement of the important parameters can be made. The authors have found it an important tool in casting work to date.