Abstract: A method, apparatus and computer program for pit mining with waste dumping is disclosed, in which material is extracted from an open pit and some of that material is sent to waste. The method optimises a joint extraction and waste refill schedule.

Abstract: A method, system and computer program for modelling an optimal mine plan is disclosed. The life of mine is divided into a plurality of increasing lengths of time (FIGS. 2 and 3) and performing optimisation steps, with each step being performed once for a predetermined time period for the remaining life of mine. Material may be stockpiled or may be sent direct to product or to waste without any stockpiling. A decision (block 10 in FIG. 1) is made as to which material is sent to product in each time period for the remaining life of mine. In each predetermined time period, material with a grade greater than a marginal grade that is not sent to produce is sent to stockpile and all material less than a marginal grade is sent to waste (14).

Abstract: A method, apparatus and computer program for pit mining with waste dumping is disclosed, in which material is extracted from an open pit and some of that material is sent to waste. The method optimises a joint extraction and waste refill schedule.

Abstract: A method of processing marine magnetic data is disclosed which comprises towing first and second magnetometers M1 and M2 behind a ship (10). Raw magnetic gradient data is obtained from the sensors and the trend of the gradient of the ship bias detected by the sensors determined. The method includes subtracting the trend from the raw magnetic gradient data to obtain corrected gradient data, and processing the corrected gradient data to provide a data output.

Abstract: This invention concerns an aircraft equipped for conducting airborne gravity surveys. In another aspect it concerns a process for creating airborne gravity surveys. The aircraft is equipped to perform the method using measured attitude data, laser range data and scan angle data, and aircraft position data.

Abstract: This invention concerns an aircraft equipped for conducting airborne gravity surveys. In another aspect it concerns a process for creating airborne gravity surveys. The aircraft is equipped to perform the method using measured attitude data, laser range data and scan angle data, and aircraft position data.