Advanced Geostatistics in the Mining Industry: Proceedings by G. Matheron (auth.), Massimo Guarascio, Michel David,

By G. Matheron (auth.), Massimo Guarascio, Michel David, Charles Huijbregts (eds.)

When Prof. Hatheron used to be requested to delineate the heritage of geostatistics, he objected that such self-discipline continues to be too "young" to be handled from a ancient standpoint. The increasingly more expanding functional purposes requiring more recent and more moderen methodologies may relatively recommend the need of empha­ sizing the stairs taken and the implications acquired in past times. the explanation of convinced epistemological offerings in addition to the difficul­ ties and good fortune in developing a discussion with the folk probably to learn from the result of geostatistics are important premises to appreciate the current prestige of this self-discipline. The human bearing of characters of the individuals that experience introduc­ ed and studied this technological know-how mixing concept with monetary prac­ tics is an element taking part in a no longer inconsiderable position within the enhance­ ment of geostatistics. those techniques have been the ideas in organizing the ASI-Geo­ stat seventy five. Canada, France and Italy are 3 diverse events in an commercial and educational context, in particular within the interac­ tion among those fields. but it was once our influence that the time had come to collect specialists, students, and folks in­ terested in geostatistics so one can review its current posi­ tion on a number of degrees within the assorted nations and to debate its destiny customers. Prof. Hatheron and Hr. Krige in addition to different widespread humans have been of a similar opinion.

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Extra resources for Advanced Geostatistics in the Mining Industry: Proceedings of the NATO Advanced Study Institute held at the Istituto di Geologia Applicata of the University of Rome, Italy, 13–25 October 1975

Sample text

Au premier abord, si l ' on regarde les formules theoriques, la reponse semble etre : j 'ai besoin de connaitre la covariance (non stationnaire) C(x ;y ) . S'il en etait reellement ainsi, il n'y aura it aucun espoir de verifier la cond ition a/ . car on ne peut pas faire l'inference d'une covariance non stationnaire a partir d'une realiSation unique. On devrait alors chercher des modeles ~ C ~ plus particuliers(par exemple FA stationnaire d ' ordre 2). Mais alors c ' est la condition c/ (compatibilite avec les donnees) qui risquerait dans certains cas de ne plus etre verifiee.

5 Problemes plus complexes. Examinons maintenant quelques cas de problemes plus complexes , exigeant davantage de prerequisites, et pour lesquels les methodes sont souvent encore en cours d'elaboration. Malheureusement , faute de place , nous devrons nous contenter d'une revue assez breve . - Examinons d ' abord les simulations conditionnelles [2]. e. cette realisation doit prendr e aux points de prelevement les valeurs reelles expe r i mentalement connues) . lei, les modeles de FA d'ordre 2 ne sont plus suffisants, puisque l ' on doit respecter de plus une condition portant sur l'histogramme .

It is fairly expensive in its first version but could certainly be improved. However the introduction of interactive graphic systems in mining companies is a very sl ow process. Impressi ve results where obtained in combining geologic al interpretation (drawing of sections) and kriging to estima te the grade of blocks. This procedure avoids the over estimation which is automatically generated when the geologists contours the high values and deny any influence to the low grades surrounding them.

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