GEOSTATISTICS

QUANTITATIVE GEOLOGY AND GEOSTATISTICS

Series Editor:

F. M. GRADSTEIN Atlantic Geoscience Centre,

Bedford Institute of Oceanography, Dartmouth, N.S., Canada

The titles published in this series are listed at the end of this volume.

GEOSTATISTICS Proceedings of the Third International Geostatistics Congress,

September 5-9, 1988, Avignon, France

Edited by

M. ARMSTRONG Centre de Geostatistique.

Ecole Nationale Superieure des Mines de Paris, Fontainebleau, France

SPRINGER SCIENCE+BUSINESS MEDIA, B.V.

Library of Congress Cataloging in Publication Data

International Geostatistics Congress t3rd : 1988 : Avignon, Francel Geostatistics : proceedings of the Third International

Geostatlstics Congress, September 5-9, 1986, Avlgnon, France edited by M. Armstrong.

p. em. -- !Quantitative geology and geostatisticsl Includes index.

ISBN 978-94-015-6846-3 ISBN 978-94-015-6844-9 (eBook) DOI 10.1007/978-94-015-6844-9

1. Mine valuation--Statistical methods--Congresses. 2. Geology--Statistical methods--Congresses. I. Ar~strong, M., 1950-II. Title. III. Series: Quantitative geology and geostatlsttcs CKluwer Academic Publishers> TN272. I57 1988 622' .1--dc19

ISBN 978-94-015-6846-3

primed on acidfi·ee paper

All Rights Reserved © 1989 by Springer Science+Business Media Dordrecht

Originally published by Kluwer Academic Publishers in 1989

Softcover reprint of the hardcover 1st edition 1989

89-2433

No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical

including photocopying, recording or by any information storage and

retrieval system, without written permission from the copyright owner.

TABLE OF CONTElfTS

FOREWORD XV

ACKNOWLEDGEMENTS xvii

LIST OF PARTICIPANTS xix

PLENARY SESSIQNS

KRIGE D.G., GUARASCIO M. and CAMISANI-CALZOLARI F.A. Early South African qeostatistical techniques in today's perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

MATHERON G. The internal consistency of models in qeostatistics............ 21

MONESTIEZ P., HABIB R. and AUDERGON J.M. Estimation de la covariance et du varioqramme pour une fonction aleatoire a support arborescent : application a l'etude des arbres fruitiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

CHILES J.P. Modelisation qeostatistique de reseaux de fractures............ 57

BRUNO R. and RASPA G. Geostatistical characterization of fractal models of surfaces 17

RIVOIRARD J. Models with orthoqonal indicator residuals..................... 91

OMRE H., HALVORSEN K.B. and BERTEIG V. A Bayesian approach to kriqinq ................................. 109

THEQRY I

SWITZER P. Non-stationary spatial covariances estimated from monitorinq data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

CHAUVET P. Quelques aspects de l'analyse structurale des FAI-k a 1 dimension.................................................... 139

vi TABLE OF CONTENTS

DOWD P.A. Generalised cross-covariances ................................... 151

CRESSIE N. The many faces of spatial prediction ..••......•......••.•.•..•. 163

OBLED C. & BRAUD I. Analogies entre geostatistique et analyse en composantes principales de processus ou analyse EOFs...................... 177

THEORY II

JEULIN D. Sequential random functions models............................ 189

CHAUTRU J.M. The use of Boolean random functions in geostatistics •.••.••.... 201

SOARES A.O. Use of a mathematical morphology tool in characterizing covariance& of indicator data.................................. 213

ALLISON H.J. Regularization in geostatistics and in ill-posed inversed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . • . • . . • . . . • • . . . . . . 225

DONG A. Kriging variables that satisfy the partial differential equation AZ = Y • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 237

THEQRY III

CALLE E.O.F. and VAN HETEREN J. Statistical inference of trend and covariance of a random field with nonstationary mean and stationary covariance properties 249

BOULANGER F. Geostatistique et processus autoregressifs : une nouvelle methode de aodelisation....................................... 259

STEIN M.L. The loss of efficiency in kriging prediction caused by misspecifications of the covariance structure ........•.•...•..• 273

MYERS D.E. Vector conditional simulation.................................. 283

SRIVASTAVA R.M. and PARKER H.M. Robust measures of spatial continuity 295

TABLE OF CONTENTS vii

THEORY IV

MATHERON G. Two classes of isofactorial models ....................... .... 309

LAJAUNIE C. and LANTUEJOUL C. Setting up the general methodology for discrete isofactorial models......................................................... 323

HU L.Y. Comparing gamma isofactorial disjunctive kriging and indicator kriging for estimating local spatial distributions ............ 335

KLEINGELD W.J. and OOSTERVELD M.M. Researching local reserve estimates for a sporadic, discrete particles deposit.............................................. 347

PUENTE C.E. Practical use of disjunctive kriging: effects of two dimensional parameterizations................. . . . . . . . . . . . . . . . . . 359

SOIL SCIENCE

LEENAERS H., OKX J.P. and BURROUGH P.A Co-kriging: an accurate and inexpensive means of mapping floodplain soil pollution by using elevation data ............. 371

OLIVER M.A. and WEBSTER R. Geostatistically constrained multivariate classification ....... 383

GOULARU M. Inference in a coregionalization model ......................... 397

WACKERNAGEL H., PETITGAS P. and TOUFFAIT Y. Overview of methods for co-regionalization analysis ............ 409

WEBSTER R. and OLIVER M.A. Disjunctive kriging in agriculture ............................. 421

OCEANOGRAPHY

GOHIN F. Analyse structurale de la temperature de surface de lamer ..... 433

MUGE F.H. and CABECADAS G. A geostatistical approach to eutrophication modelling .......... 445

viii TABLE OF CONTENTS

PEREIRA H.G. and SOARES A.O. Application of qeostatistics to qroundfish survey data ......... 459

YOUNG D.S. Geostatistics coupled with physics model for ELF signal strenqth analysis. . . . . . . . . . . . . . . . . . . . . . . • . • . . . . . . . . . . . . . . . • . . . . . 469

SEGURET S.A. Filtering periodic noise by using trigonometric kriging ..•...•.. 481

TABLE OF CONTENTS ix

VOLUME 2

PETROL I

DUBRULE 0. A review of stochastic models for petroleum reservoirs .......... 493

REMACRE A.Z., FERREIRA A.A. and SOUZA JR O.G., Spatial distribution of erratic shales using conditional simulation. . . . . . . . . . . . . . . . . . . . . . . . . • . . • . . . • . . . . . . . . . . . . . . . . . . . . 507

De FOUQUET C., BEUCHER H., GALLI A. and RAVENNE C. Conditional simulation of random sets. Application to an argilaceous sandstone reservoir ......•......................... 517

IKONOMI A. Determination de la geometrie d'un gisement monoclinal petrolier...................................................... 531

PEREIRA H.G., COSTAe SILVA A., RIBEIRO L. and GUERREIRO L. Estimation of reserves at different phases in the history of an oil field................................................ 543

PETRQL II

LE LOC'H G. An efficient strategy for combining the permeabilities : Practical application on a simulated reservoir ................. 557

HASLETT J. Geostatistical neighbourhoods and subset selection............ 569

RENARD D. Automatic structure recognition ................................ 579

BARDOSSY A., BARDOSSY Gy. and BOGARD! I. Application of geological information to kriging ............... 591

LANGLAIS V. On the neighborhood search procedure to be used when kriging with constraints............................................... 603

X TABLE OF CONTENTS

BYPROLOGX I

AHMED S. and DE MARSILY G. Co-kriged estimates of transaissivities using jointly water level data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . . . . . 615

SCHAFMEISTER-SPIERLING M.Th. and BURGER B. Spatial simulation of hydraulic parameters for fluid flow and transport models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • . • . . . . . . . . 629

ROUHANI S. and HALL T.J. Space-time kriqinq of qroundwater data ........•......•..•....•. 639

RIBEIRO L.T. and MUGE F.H. A geostatistical approach to the modelling of a piezometric field ....•......•..•.•.•............•..•........................ 651

IRIS J.M. Effet de la variabilite spatiale de ruisselleaent sur !'estimation des crues ...........................•...••......••. 661

HYDROLQGY II

BONANO E.J., DAVIS P.A., BRAS R.L. and KITANIDES P.K. Methodology for estimating groundwater travel times at a nuclear waste repository using a physically based geostistical approach....................................................... 673

HARPER W. V. and CLARK I. Travel path uncertainty - A case study in conditional simulation..................................................... 685

GUERTIN K. and VILLENEUVE J.P. Estimation and mapping of rank related uniform transforms of ion deposition from acid precipitation .•.•.•...••..........•... 699

SMYTH J.D. and ISTOK J.D. Multivariate geostatistical analysis of groundwater contamination by pesticide and nitrate: a case history ..•.....• 713

SAMPER CALVETE F. J. and NEUMAN S. P. Geostatistical analysis of groundwater quality data from the Madrid basin using adjoint state maximum likelihood cross-validation............................................... 725

TABLE OF CONTENTS

OTHEB APPLICATIONS I

RALLET J.L. Geometric modelling and geostatistics ........................... 737

DALY C., JEULIN D. and LAJAUNIE C. Application of multivariate kriging to the processing of noisy images ...............................................•.......... 749

CREUTIN J.D., ANDRIEU H. and DELRIEU G. One simplification du cokrigeage appliquee a l'etalonnage d'images de teledetection en hydrometeorologie ................. 761

MARBEAU J.H. and MARBEAU J-P.E. Formal computation of integrals for 3-D kriging ................ 773

BLANCHIN R., CHILES J.P., and DEVERLY F. Some applications of geostatistics to civil engineering ........ 785

SAMfLING

LASLETT G.M. and SANDLAND R.L. Precision and accuracy of kriging estimators with inter-laboratory trial information ............................ 797

BARNES R.J. Sample design for geologic site characterization .............. 809

ROYER J.J. Multivariate geostatistics and the sampling problems 823

MUNOZ-PARDO J., BOULIER J.F. and VAUCLIN M.

Etude de l'echantillonnage d'un phenomene bidimensionnel par simulation d'une fonction aleatoire ........................... 837

SOUSA A.J. Geostatistical data analysis: an application to ore typology ... 851

MINING I

DOWD P.A. Some observations on confidence intervals and kriging errors.. 861

BUXTON B.E. An application of the construction of confidence intervals for global recoverable reserve estimates:..................... 875

xii TABLE OF CONTENTS

COLEOU T. Cutoff grade optimization: a Panacea or a Fool's Paradise ..... 889

GUARASCIO M., PIZZUL C. and BOLOGNA F. Forecasting of selectivity..................................... 901

RAVENSCROFT P.J. A comparison of selectivity in a number of South African qold mines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911

MINING II

BORDESSOULE J.L., DEMANGE C. and RIVOIRARD J. Using an orthogonal residual between ore and metal to estimate in-situ uranium resources ............................. 923

RASPA G., BRUNO R. and KOKKINIOTIS P. An application of disjunctive kriging: using the negative binomial model with different change of support models ......... 935

REMACRE A.Z. Uniform conditioning versus indicator kriging ................. 947

ALFARO M. Estimation non-classique d'un gisement d'or ..................... 961

CHAMPIGNY N. and ARMSTRONG M. Estimation of fault-controlled deposits ......................... 971

STAND BY PAPJRS

MARCOTTE D. Le krigeage biqaussien, une aternative au krigeage multi-gaussian pour !'estimation des reserves recuperables ........... 985

ARMSTRONG M., GILLIES A.D.S., JUST G.D., LYMAN G.D. and WU Y.Y. Review of the applications of geostatistics in the coal industry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 995

A8STBACTS OF CASE-STUDIES . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . 1007

DELFINER P. and DELHOMME J.P. A method for reconstructing geological surfaces from dipmeter data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009

DIMITRAKOPOULOUS R. Characterization of petroleum reservoirs using geostatistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010

TABLE OF CONTENTS xiii

HALVORSEN K. , BERTEIG V. and OMRE H. Prediction of hydrocarbon pore volume by use of Bayesian conditional simulation ..•....................•................. 1011

HERNANDEZ-GARCIA G. Automatic history matching in oil reservoir simulation: a geostatistical approach ...........••.........................•. 1012

D'AGOSTINO V. and DE LUCA P. Geostatistical approach for aultitemporal TM images registration ..................................••.......•....... 1013

OSMANI S. and BEQIRAJ G. Considerations geostatistiques sur les splines plaque mince .... 1015

SAMRA J.S., ANLAUF R. and RICHTER J. Analysis of auto and co-spatial variation of tree growth, leaf nutrients and soil sodicity: a case study ................ 1016

HERZFELD U.C. Geostatistics in bathymetry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1017

KACEWICZ M. on the problea of prediction in orebody aodelling ....•......... 1018

DERAISME J. and RENARDET P. Study of an uranium open pit project by aeans of a simulation on a geostatistical model of deposit ....•.•..•............•.... 1019

NAMYSLOWSKA-WILCZYNSKA B. The geostatistical estimation of Cu ore deposits ............... 1020

SORAWARDI and SUNHARDI S. Geostatistical study on the Peaali primary tin mining, Bangka, Indonesia. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1021

VALENTE J.M.G.P., GIRODO A.C., DACOSTA M.D. and CAMPOS A.C.A. Charts of quality control using kriging ........................ 1022

WEBER V. Experience with the application of geostatistical methods in the hardcoal mining industry of F.R.G .......................... 1023

MARIJANOVIC P. Les bauxites karstiques yougoslaves et la geostatistique ..•.... 1024

STEFFENS F.E. Design of a raingauge network for a weather modification experiment. . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1025

Index 1027

FOREWORD

The Third International Geostatistics Congress was held in the papal palace at Avignon from 5th to 9th September, 1988.

In the five years since the last international congress at Lake Tahoe in California, geostatistics has made considerable theoretical advances and the range of applications has greatly widened.

On the theoretical side, the question of the internal consistency of the models has been raised. This is crucial, in particular, in nonlinear estimation. New models for random functions have been developed, and others from mathematical morphology and random set theory are now being used in geostatistics. The relationship between fractal models and geostatistical ones has been studied.

On the practical side, even though applications in mining remain important, the role of geostatistics in hydrology and in the petroleum industry has greatly increased. In both the mining and the petroleum industries, the need for methods of simulating the geometry of ore bodies and reservoirs is felt. New applications are now being made in such diverse fields as soil science, oceanography, agriculture, image analysis and teledetection.

The papal palace in Avignon proved an excellent site for the congress, by providing a forum that encouraged discussion. The Organizing Committee hopes that this atmosphere of innovation and discussion will come through to readers of the proceedings.

XV

Georges Matheron (Chairman) Michel David Peter Dowd Massimo Guarascio Jose Rogado Margaret Armstrong (Secretary)

ACKNOWLEDGEMENTS

The Organizing Committee would like to thank the members of the four scientific conittees who had the difficult task of selecting the papers to be presented for their work, and also the referees who reviewed the papers. Their conscientious work considerably improved the quality of the articles.

The congress was made possible by the financial aid of certain companies and international associations. The Organizing Committee would like to thank them publicly for generously sponsoring a session.

Alcan International Ltd (Canada)

de Beers consolidated Mines Ltd (South Africa)

COGEMA (France)

Goldfields of South Africa

International Association of Matheaatical Geology

Partex CPS (Portugal)

Penarroya (France)

Shell Exploratie en Produktie Laboratium (Netherlands)

Total Coapagnie Miniere (France)

The Organizing Couittee wishes to express its thanks to these people and companies without whose help and support the congress would not have been such a success.

xvii

IRlBU INTERNATIONAL GEOSTAtlSTICS CQNGRESS

.Lill Ql ~ Aim APDRJ::SSES 2I DJ;:I.EGATES

DrS. AHMED, NATIONAL GEOPHYSICAL RESEARCH INSTITUTE, HYDERABAD 500 007, INDIA

Prof M. ALFARO, CENTRE DE INVESTIGACION MINERA Y METALLURGICA, CASILLA 170, SANTIAGO, CHILE

Mr C. ALIMONTl, DICMMPM, UNIVERSIDAD Dl ROMA "LA SA~IEN~A", VIA EUDOSSIANA 18, ROMA, ITALY

Dr H. ALLISON, CSIRO DEPT OF WATER RESOURCES, PRIVATE BAG, WEMBLEY WA 6014, AUSTRALIA

Dr R. ANLAUF, INSTITUTE OF SOIL SCIENCE, HANNOVER UNIVERSITY, HJ::KRJ::NHAUS!!:R STJ:ol 2, D-3000 HANNOVER 21, WES"t GJ::RMANY

Dr M. ARMSTRONG, CENTRE DJ:: GEOSTATISTlQUE, ECOLE DES MINES DE PARIS, 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr A. BARDOSSY, INSTITUTE OF HYDROLOGY AND WATER RESOURCES, UNIVERSITY Of KARLSRUHE, KAISERSTR 12, D-7500 KARLSRUHE, WEST GERMANY

Prof. R.J. BARNES, DEPT OF CIVIL ENGINEERING , UNIVERSITY OF MINNESOTA, 500 PILLSBURY DR, MINNEAPOLIS, MN 55455, U.S.A.

Mr J-P BEHAXETEGUY, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS, 35 RUE ST HONORE,· 77305 FONTAINEBLEAU, FRANCE

Dr G. BEQIRAJ, ACADEMY Of SCIENCES, INSTITUTE OF COMPUTING, TIRANA, ALBANIA

Dr V. BERTEIG, NORWEGIAN COMPUTING CENTER, P.O. BOX 114 BLINDERN, N-0314 OSLO 3, NORWAY

Dr H. BEUCHER, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS, 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr P. BHANU PRASAD, LERMAT ISMRA UNIVERSITE, BD DU MARECHAL JUIN, 14032 CAEN, FRANCE

Mme R. BLANCHIN, BRGM, BP 6009, 45060 ORLEANS CEDEX 2, FRANCE

Mr J-L BORDESSOULE, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLHAU, FRANC~

xix

UST OF PARTICIPANTS

Mr F. BOULANGER, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr B. BOURGINE, ECOLE NATIONALE SUPERlEURE DES TECHNIQUES INDUSTRIELLES ET DES MINES D'ALES, 6 av. de CLAVIERES, 30107 ALES CEDEX, FRANCE

Prof. L. BRAGA, FEDERAL UNIVERSITY OF RlO DE JANEIRO, C.P. 2386, 20.001 RIO DE JANEIRO, R.J., BRAZIL

Ms I. BRAUD, INSTITUT DE MECANIQUE DE GRENOBLE, GROUPE D'HYDROLOGlE B.P. 68, 38402 SAINT MARTIN D'HERES CEDEX, FRANCE

Dr J:l. I. BROOKER, DEPARTMEN'l' OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF ADELAIDE, G.P.O. BOX 498 ADELAIDE, SOUTH AUSTRALIA, AUSTRALIA

Dr R. BRUNO, DICMMPM, UNIVERSITY DI ROMA "LA SAPIENZA", VIA EUDOSSIANA 18, 00184 ROMA, ITALY

Dr P. BURROUGH, DEPT. PHYSICAL GEOGRAPHY, UNIVERS1TY OF UTRECHT,POST BOX 80115, 3508 TC UTRECHT, HOLLAND

Dr B.E. BUXTON, BATTELLE MEMORIAL INSTITUTE, 505 KING AVENUE, COLUMBUS OHIO 43201 1 USA

Dr E.O.F. CALLE, DELFT GEOTECHNICS, P.O. BOX 69, 2600 AB DELFT HOLLAND

Dr F.A. CAMlSANI-CALZOLARI, ANGLOVAAL LTD, P.O. BO~ 62379 MARSHALLTOWN 2107, SOUTH AFRICA

Mr P. CARRASCO, RGC EXPLORAl'ION P'l'Y LTD, CENTRE COURT, 1 PIRIE STREET FYSHWICK 2609, AUSTRALIA

Dr J.D. CARTIGNY, INSTITUT FRANCAIS DU PETROLE, 2-4 Av. BOIS PREAU 92400 RUEIL MALMAISON, FRANCE

Mr P.C. CAUMAR'l'IN, COGEMA, DIVISION DE VeNDEE, Bl:' 45, 85290 MORTAGNE/SEVRE, FRANCE

Mme A. CEITO, DEPT OF GEOLOGY, UNIVERSITY OF LUANDA, LUANDA ANGOLA

Mr N. CHAMPIGNY, ROBERTSON & ASSOCIATES, 145 KING ST WEST 'l'ORON'l'O ONTAR!O M5H 1J8 1 CANADA

Mr J-M CHAUTRU, CENTRE DE GEOSTATISTIQUE, ECOLE m:s MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr P. CHAUVET, CENTRE DE GEOSTA'l'ISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

LIST OF PARTICIPANTS

Prof. M. CHICA-OLMO, UNIVERSIDAD DE GRANADA, DEPTO GEODINAMICA AVUA FUEN"l'ENUEVA S/N GRANADA, Sl'AlN

Dr J.P. CHILES, BRGM, BP 6009, 45060 ORLEANS CEDEX 2, FRANCE

Dr T. COLEOU, PETROSYSTEMS, 1 RUE LEON MIGAUX, 91302 MASSY CEDEX FRANCE

Dr N.A.C. CRESSIE, DEPT. OF STATISTICS, 102 E SNEDECOR HALL IOWA STATE UNIVERSITY, AMES IA 50011, U.S.A.

Dr J.D. CREUTIN, INSTITU'l' DE MECANIQUE DE GRENOBLE, BP 53 X 38041 GRENOBLE CEDEX, FRANCE

Mr C. DALY, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr M. DAGBERT, SYSTEMES GEOS'l'AT INTERNATIONAL INC, 4385 S'f HUI:II::R'l' H1 MONTREAL - QUEBEC, CANADA

xxi

Dr V. D'AGOSTINO, TECHNOPOLIS CSATA NOVUS OCTUS, STRADE PROVINCIALE POR CASAKASSIMA, 70010 VALENZANO (SARI), ITALY

Prof. M. DAVID, ECOLE POLYTECHNIQUE DE MONTREAL, CP 6079, STATION A MONTREAL H3C 3A7, CANADA

Dr P.A. DAVIS, SANDIA NATIONAL LABORATORIES, DIVISION 6416 P.O. 80~ 5800, ALBUQUERQUE NEW MEXICO, U.S.A.

Mr L. DE FREITAS, C.V.R.M., I.S.T., AV ROVISCO PAIS, 1096 LISBOA POR'fUGAL

Dr P. DELFINER, SCHLUMBERGER E.P.S., 26 RUE DE LA CAVEE, 92140 CLAMART r'RANCE

Mr C. UEMANGE, COGEMA BRU/DM/SER, BP 4, 78141 VELIZY V!LLACOUBLAY FHANCE

Dr J. DERAlSME, GEOVARIANCES, 1 rue CHARLES MEUNIER, 77210 AVON, FRANCE

Dr f. DEVERLY, BRGM, BP 6009, 45060 ORLEANS CEDEX 2, FRANCE

Dr P. DIEHL, PREUSSAG ERDOEL & ERDGAS, ARNDTSRT 1, 3000 HANNOVER WEST GERMANY

Mr R. DIMI'l'RAI<OPOULOS, ECOLE POLYTECHNIQUE DE MONTREAL, DEPT DE GENIE MINERAL, CP 6079 SUCC. A, MONTREAL QUEBEC H2'f 2W9, CANADA

Ms A. DONG CEN'rRE DE GEOS'l'A'riS'riQUE ECOLE DES MINES DE PARIS 35 RUE ST HONOKE, 77305 FONTAINEBLEAU, FRANCE

xxii USTOFPARTICIPANTS

Dr P.A. DOWD, UNIVERSITY OF LEEDS, DEPT MINING AND MINERAL ENGINEERING LJ::J::U5 LS2 9J"r, GK.r;AT BKI"rAIN

Dr t'. UOYJ::N, WJ::STJ::RN GJ::OPHYSICAL, 3600 BRIARPARK DRIVE P.O. BOX 2469, HOUSTON TEXAS 77252-2469, U.S.A.

Dr O.R.F. DUBRULE, SHELL EXPLORATIE EN PRODUKTIE LABORATOR!UM VOLMJ::RLAAN 6, 2288 GM RIJSWIJK, HOLLAND

Mr Y. UUFOU.H, COGEMA BRU/DM/SER, .I::IP 4, 78141 VELUY VlLLACOU.I::ILAY, FRANCE

Dr J.J. FERREIRA, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 616 KIMBERLEY SOUTH A~'RICA

Ur G. FLA'l"MAN, US EPA EMSL/LV, STA'l"ION EAD, P.O. BOX 15027 LAS VEGAS N.V. 89115, U.S.A.

Dr R. FLORAN, UNOCAL, 376 S. VALENCIA AVE., BREA. CA. 92621, U.S.A.

Dr C. DE FOUQUET, CEN'l'RE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FON'rAINEBLEAU, FRANCE

Mr X. FREULON, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr A. GALLI, CENTRE DE GEOS'l'ATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE s·r HONOK£, 77305 FONTAINEBLEAU, FRANCE

Dr H. GARCIA-PEREIRA, CVRM I.S.T., AV. ROVISCO PAIS 1096 LISBON, PORTUGAL

Mr ~·. GEl-'1-'ROY, CENTRE DE GEOS'l'ATISTIQUE 1 ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FON'fAINEBLEAU, FRANCE

DK I. GI::REN'fSER, BANAYASA'l'l EGYI::SULES (UNION MINER!::, HONGRIE) TATABANYA, MARTIROK UTJA 90, HUNGARY

Dr 1-'. GOHIN, UREMER BREST, BP 70, 29263 PLOUZANE, FRANCE

Dr M. GOULARD, LABORATOIRJ:: DE BIOME'fRIE, INRA DOMAIN£ St PAUL Bt' 91, 84140 MONTFAVE1', FRANCE

Ur A. H. GRIPP, UEPTO DE ENGENHARIA DE MINAS, UNIVERSIDADE FEDERAL DE MINAS GERAIS, CAIXA POSTAL 1406, 30161 BELO HORIZONTE M.G., BRASIL

Or Y.Y. UE GRUlJ'l'ER, AGRICULTURAL MATHEMAl'ICS GROUP, P.O. BOX 100 WAGENINGAN, HOLLANU

Ur M. GUARASCIO, 12C VIA URBANA, ROMA, ITALY

Ur K. V. GUERTIN, INRS - EAU, 2700 RUE EINS'fEIN, Ste FOY (QUEBEC), CANADA

UST OF PARTICIPANTS

Mr D. GUIBAL, LEVEL 5, 156 PACIFIC HIGHWAY, St LEONAKUS NSW 2065 AUSTI\ALIA

Dr 1. HALLEUX, l.N.l.E.X., HUE DU CHERA 200, B-4000 Lll::GE, BELGIUM

Dr K. HALVORSEN, NORWEGIAN COMPUTING CENTRE, POSTBOX 114 BLINOJ::RN N-0314 OSLO, NORWAY

Ur A. HARISLUR, GAZ UE FRANCE DTEN, 361 Av. du Pt. WILSON 93211 St DENIS CEDEX, .FRANCE

Ur J. HASLE'l''l', UJ::t''l'. STATlSTICS, TRINITY COLLEGE, UUBLIN, IRELAND

xxiii

Ur U. HEINI:i!CH, GEOGRAt'HlSCHES INS'lTfUT, CHRISTIAN ALBRECH'l'S UNIVJ::RSITA'l' OLSHANSENS'l'R 40, 23 KIEL 1, WES'l' GERMANY

Dr G. HERNANDEZ-GARCIA, INS'l'I'l'U'l'O MEXICANO DEL PETROLEO-EXt'LOTACION 1::.11:: L. CAI:\UENAS 152, MEXICO U.F. 07730, MEXICO

Dr U.C. HEI:ii:.FELD, INS'l'l'l'UT FUI:{ GEOLOGIE MATHEMATISCHE GEOLOGIE, FREIE UNIVERSITA'l', MALTESER S'l'R 74-100, D-1000 BERLIN 46, WEST GERMANY

Mr L. HU, CENTRE DE GEOS'l'ATIS1'IQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FON'l'AlNEBLEAU, FRANCE

Mt· Y-G. HUANG, ECOLE NATIONAL!:: SU!:'EIHEURE DE GEOLOGIE, }{IJE DU DOYEN MARCEL ROUBAULT, 54501 VANDOEUVRE LES NANCY, FRANCE

Mr A. IKONOMI, CEN'fRE DE GEOSTA'flSTIQUE, ECOLE DES MINES DE PARIS 35 RUE S'l' HONOKE, 77305 Ji'ON'l'AINEI:!LI::AU, FRANCE

Dr J.M. IRIS, OHSTOM, 70-73 ROUTE D'AULNAY, 93140 S'l' DENIS, J:'J:{ANCE

Dr J.D. ISTOK, DEPT. OF AGI:UCULTURAL ENGINEERING, OREGON STATE UNIVERSITY, CORVALLIS OREGON 97331, U.S.A.

Mr 0. JA(,lUI::'l', CH BJOLLEYKE 46, 1066 EJ:IALlNGES, SWl'l'ZJ::l.{LANU

Dr J.CI. JEJ:ISEN, STATOIL, BOX 300, 4001 S'l'AVANGER, NORWAY

Dr U. JEULlN, CENTRE UE GEOS'l'A'flS1'lQUE, ECOLE DES MlNES DE PARIS 35 RUE S'l' HONORE, 77305 J..'ON'l'AINEBLEAU, FRANCE

Dr Jill. KACEWlCi:, lNS'l'l'fU'l' FUR GEOLOGIE MA'l'HEMA'rlSCHE Gi::OLOGIE MAL'l'ESEHSTR. 74-100 (HAU~ D), U-1000 BERLIN 46, WEST GERMANY

Dr W.J. KLElNGELU, 1.31 8TH STREET, LINUEN, JOHANNESBURG, SOUTH AFRICA

Mr t'. l<OKKlNIOTIS, :nMISCO, MAN'l'OUDI-FOURNI, EUBEA, GRJ::ECE

xxiv UST OF PARTICIPANTS

Dr L. 0 KOVACS, HUNGARIAN GEOLOGICAL SURVEY H -1143 BUUA~£5'1' NE~S'l'AlllON U'l' 14, HUNGARY

Prof. D.G. KRIG£, P.O. BOX 121, FLORIDA HILLS, SOUTH AfRICA

Mr R. KRZANOWSKI, ALBERTA RESEARCH COUNCIL, P.O. BOX 8330, POST OUTS'l'ATION }', EDMONTON T6H 5X2, CANADA

Dr C. LAJAUNIE, CEN'rRE DE GEOSTATlSTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Ms V. LANGLAIS, CEN'rRE DE GEOS'rATlSTIQUE, ECOLE DJ::S MINJ::S Dl:: PARIS 35 RUE ST HONORE, 77305 FONTAINEBLKAU, FRANCE

Dr C. LANTUEJOUL, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Ur ~. LA FOIN'l'E, AH.CO 011 lie GA5 CO, 2300 PLANO PARKWAY PLANO TEXAS 75075, U.S.A.

Dr E. LEFEUVRE, BRGM DT/ISA, B.P. 6000, 45060 ORLEANS CEDEX 2, FRANCE

Dr H. LEENAERS, DEP'l'. OF GEOGRAPHY, STATE UNIVERSI'l'Y UTRECHT P.O. BOX 80115, 3508 TC UTRECHT, HOLLAND

Dr G. LE LOC'H-LASH~MES CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS, 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr Y. LEVY, NEGEV lJHOSPHAT.b:S L'l'D, DIMONA, ISRAEL

Kr LlAO HONGTAO, BRGM/DT/ISA, BP 6009, 45060 ORLEANS CEDEX 2, FRANCE

Mr A. LIB.b:RTA, AGRISIEL SlJA, VIA T.b:VERE 50, ROMA, ITALY

Mr M. LINARES, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Mr LOPES, DEPT OF GEOLOGY UNIVERSITY OF LUANDA, LUANDA, ANG<,;:.A

Dr E. LUDVIGSJ::N, DIV. OJ:" MINING ENG. , NORWEGIAN IN!iTITU'!E 0.1!' TJ::CHNOLOGY 7034 NTH-TRONDHEIM, NORWAY

DrY. MA, SNEA(P}, RESIDENCE O~E~, RUE JEAN GENESE, 64000 PAU, FRANCE

Prof. M. MAIGNAN, UNIVERSI'l'E DE LAUSANNE, INST. DE MINERALOGIE, BFSK2 1615 LAUSANNE DORIGNY, SWITZERLAND

Prof. J -L. MALLE'r, ECOLE NATIONALE SUPERlEURE D£ G.I::OLOGIE RUE DU DOYEN MARCEL ROUBAULT, 54501 VANDOEUVRE LES NANCY, FRANCE

UST OF PARTICIPANTS

Dr J.B. MARBEAU, GEOMATH. INC., 4860 WORD ROAD, WHEAT RIDG~ CO 80033 U.S.A.

Dr U. MARCO'l'TE, ECOLE POL':Cl'I::CHNIQUE DE MONTRI::AL CP 6079, SUCC. A MONTREAL H3C 3A1,CANADA

Dr A. MARECHAL, PETROSYSTEMS, 1 RUE LEON MlGAUX, 91302 MASSY CEDEX FRANCE

XXV

Dr P. MARIJANOVIC, ENERGOINVEST ALUMINIJ MOSTAR, GEOLOSKA ISTRAZIVANJA V. NA~ORA 5, HUNGARY

Prof. G. DE MARSILY, UNIVERSlTE PARIS VI LABORATOlRE DE GEOLOGIE APPLIQUEE, 4 PLACE JUSSIEU, 15252 PARIS CEDEX 05, FRANCE

Mr J.C. MARTIN, BRGM/IMRG, BP 6009, 45060 ORLEANS CEDEX 2, FRANCE

Dr G. MATHERON, CEN'rRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE S'f HONORE, 71305 FON'l'AINEBLEAU, FRANCE

Dr P. MONESTIE~, LABORATOIRE DE BlOMETRIE lNRA, UOMAINE St PAUL BP 91, 84140 MONTFAVET, FRANCE

Prof. F. MUGE CVRM I.S.T., Av. ROVISCO PAIS 1096 LISBON CODEX, PORTUGAL

Or J. f. MUNO~-PARDO, UEP'fO UJ:: ENGENlERA HlURAULICA, PON'l'IFICA, UNlVERSIDAD CATOLICA DE CHILE, CASILLA 6111, SANTIAGO CHILE

Prof. D.E. MYERS, UNIVERSI'rY OF ARIZONA, DEPT. OF MA'fHEMATICS TUCSON 85121, U.S.A.

Dr B. NAMYSLOWSKA-WILCZXNSKA, INSTITUTE OF GEOTECHNICS, TECHNICAL UNIVERSI'l'Y, WYB. WYSPlANSKIEGO 27, 50-370 WROCLAW POLAND

Dr C. OBLEU, INSTITUT DE MECANIQUE DE GRENOBLE, GROUPE D'HYDROLOGIE B.P. 68, 38402 SAINT MAR'riN D'HERES CEOEX, FRANCE

Dr J.P. OKX, BKH CONSULTING ENGINEERING, POSTBUS 93224, S. GRAVENHAGE HULLANU

ru-~ IJ" !' ... 1\L!:'A., lCA.li'iA.S.. r..Jilli.O!'J.cAL.._ SllRVEYJ. 1930 CONSTANT AVENUE LAWRENCE, KANSAS 66046-2598, U.S.A.

Dr M.A. OLIVER, DEPT. OF GEOGRA~HY UNIVERSITY OF BIRMINGHAM P.O. BOX 363, BlRMINGHAM, GREAT BRITAIN

Dr H. OMIU;, NORWJ::GIAN COM!JU'l'ING CENTER, POSTBOX 114 BLINDERN, N-0314 OSLO 3, NORWAY

xxvi UST OF PARTICIPANTS

DR M.M. OOS'l'ERVELD, DE BEERS CONSOLIDATED M.lNJ::S L'l'D, 1'.0. BOX 616 KiMI:li::KLi::Y SOUTH AFKICA

Dr s. osMArH, ACAUJ::MY m· scrJ::NcJ::s, INS'U'l'UTJ:: o~· COMl'U'r!NG, URANA ALBANIA

Mr E. l'ARDO-IGUZQUIZA, UNIVERSIDAD DE GRANADA, DJ::PTO GEODINAMICA AVUA FUENTENUEVA S/N GRANADA, SPAIN

Dr H.M. J:IARl<ER, I:'LUOR DANIEL, 10 'tWIN DOLPHIN DRIVE, RI::UWOOU ern:, CALIFORNIA 94065 U.S.A.

Mr A. l:'J::URO,NA'riONAL BURl::AU Or' GI::OLOGY, MAPUTO, MO~AMBIQUI::

Mr P. PINSON, COGEMA, DIVISION DJ:: VENDEE, BP 45,85290 MORTAGNE/SEVRE I:'RANCI::

Dr C.E. J:IUJ::NTE, DEPT. OF LAND AIR AND WATER RJ::SOURCES, UNIVERSITY Of CALIFORNIA 223 VI::IHMEYET HALL, DAVIS CA 95616, U.S.A.

Dr G. RASl'A, DICMMl'M UNIVJ::RSITY DI ROMA "LA SAl'lEN~A" VlA EUUOSSlANA 18, 00184 N.Ol"'A, l'tALY

Mr 1'. RAVJ::NSCROFT, GJ::NCOR, P.O. BOX 61820, MARSHALLTOWN 2107 SOU1'H AFN.lCA

Dr A. l::. REMACRE, ESCOLA OJ:: MINAS, DJ::PAN.TAMENl'O DE MINI::RACAO 35400 OURO PRE'ro MG, BRAUL

Mr U. 1\J::N.ANU, CEN'l"RE DE GI::OSTA'!'ISTIQUE, ECOLE DES MINJ::S 01:: PARIS 35 RUI:: ST liONORI::, 77305 FONTAINEBLEAU, FRANCE

lir J,. IHI:ll::liW, CVHM 1. 5. '1". , AV. ROV LSCO PALS 1096 LISI:lON CODEX, POR'tUGAL

Dr .1 • .IUVOli:IARU, CJ::Nl"RJ:: 01:: GJ::OS'l'A'US'!'lQUJ::, ECOL.I:: D.I::S MLNJ::S DE PARIS 35 RUE S'r HONOR!::, 77 305 FONTAINEBLEAU 1 FRANCE

Mr f. KOH!DA, BRGM BJ:I 6009, 45060 ORLJ::ANS CEDEX2, FRANCE

Prof. J .IJ. ROGAUO, CVRM, INSTITUTO SUPERIOR 'fECNICO, AV. ROVISCO PAIS 1096 LISBOA COU.J::X, J:IORTUGAL

Ur L.l'. ROMBOU'rS, ARI::DOR GUINI::J:: S.A., 10 RICK~'ORUS HlLL,AYLI::SBURY liP20 21\X, GREA'r Bl:l.l'fAlN

Ur S. ROUliANl, SCHOOL OF Cl V lL ENGlNEI::H.lNG, GEORGIA n:cn. Al'LAN'l'A GA. 30332, U.S.A.

Ur J.J. kOYEH CRPG BP 20, 15 rue NUDES PAUVRl::S 54500 VANDOEUVRK LES NANCY, YRANC.I::

UST OF PARTICIPANTS xxvii

Mr A.G. ROYLE, UNIVERSITY 0~' LEEDS, DEJ:IT MINING AND MINERAL ENGINJ::J::RlNG LEEUS LS2 9J'r 1 GI.\J::A'r 81.\I'l'AIN

Or K.~. NU'f'l'J::N, SHJ::LL Rl-:!ii::ANCH, J:I.O. BOX 60, 2280 AB 1.\lJSWlJK, HOLLAND

Mr L. SALVATO, PROGEMISA SPA, VIA CONTIVECCHI 7, 09100 CAGLIARI, ITALY

Ur J. SAMPJ::R, UNlVERSIDAD POLl'rECNICA CATALUNA, C. JORDl GIRONA !:iALGAlJO 31, BARCELONA 08034, Sl'AlN

Dr ,J . S . HAMRA 1 lNS'l'lTU'l'E FUR BODJ::NKUNDE 1 Hl-:RRENHAUSER S'l'RABE 2 U-3000 HANNOVER 21, WEST GERMANt

Dr R.L. SANDLAND, CSIRO DIVISION OF MATHEMATICS AND STATISTICS P.O. BOX 218 LINUI:'IELU NSW, AUSTRALIA

Mr H. SANGUlNJ::'l'Tl COGJ::MA BRU/DM/SER, BP 4 78141 VELIZY VlLLACOUBLAt, FRANCE

Dr SCHAI:'~'RIN, GEODJ::TlC INSTITO'l'E, S'l'UTTGAR'l' UNIVERSITY, KEPLJ::RSTRASSE 11 D-7000 STUTTGAR'l' 1, WEST GERMANY

Dr M. 'l'h. SCHAFMJ::IS'l'I::fi.-SPH:RLING, INS'l'. ~'UR GEOLOGIE MA'l'HEMA'l'ISCHE, F. U. BERLIN, MALTESERS'l'R 74-100, G-1000 BERLIN 46, WES'l' GERMANY

Mr S. SEGURET, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr J. SERRA, CENTRE DE MORJ:IHOLOGlE MATHEMATIQUE, ECOLE DES MINJ::S DE PAI.UH, 35 RUE S'l' HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr H. SlEMES, INSTITUT FUR MINERAL UNO LAGERSTATTENLEHE, RHEIN WEST F TECHNISCHE HOCHSCHULE WULLNERSTRASSE 2, D-5100 AACHEN WEST GERMANY

Dr A. SILVA CVRM I.S.T., Av. ROVISCO PAlS, 1096 LISBON CODJ::X, PORTUGAL

l..lr A.O. SOARI::S, CVRM I.S.'£., Av. ROVlSCO PAlS, 1096 LlSBON CODEX, J:ION'l'UGAL

Prof. M. SOULIE, ECOLE POLYTECHNIQUJ::, SECTION GEOTECHNIQUE CAMPUS UNIVERSITY DE MONTREAL, MONTREAL- QUEBEC H3C 3A7, CANADA

Dr A.J. SOUSA, CVRM l.S.T., Av. ROVISCO PAIS, 1096 LISBON CODEX, POK'fUGAL

Mr O.G. HOU~A JR, £SCOLA OE MINAS DEPARTAMENTO 0£ MlN~RACAO 35400 OURO PKE'rO MG, BRAUL

Mr 1.\.M. SRIVAS'l'AVA, LIAD - ENSG, Rue du DOYEN M. ROUBAULT P.O. BOX 40, 54501 VANDOEUVRE LES NANCY, FRANCE

xxviii UST OF PARTICIPANTS

Prof F. STEFFENS, DEPT OF STATISTICS, UNISA, PRETORIA, RSA

Prof. 1"1 1. S"l"i::lN, UJ::i:'T. OJ:" S"l'A"flS"rlCS, UN!VJ::RS!U OJ:" CHICAGO 5734 S. UN!VERSIT~ AVE., CHICAGO IL 60637, U.S.A.

Mr SURAWARD!, SOUTHJ::AST ASIA TIN RESEARCH ANU DEVELOPMKNT CENTRE T!GJ::R LANE, 31400 li:'OH, MALAYSIA

.Prof. P. swl'nElt, S'rATisucs DEP'r., STANFORD UNIVERSITY, STANJ:"ON.D CA 94305, U.S.A.

Dr M. TAHERI, INtERVEP S.A., P.O.BOX 76343, CARACAS 1070A, VENEZUELA

Ms C.M. THOMPSON, DEPT. OJ:' S'rATIS'UCS, OREGON STATE UNIVERSITY CORVALLIS OREGON 97331, U.S.A.

Mr M.L. THURSTON, ANGLO AMERICAN CORPORATION OF SOUTH AFRICA, WELKOM SOUTH AFRICA

Mr ~. TOU~'~'AIT, CENTRE DJ:: GEOSTA'l'ISTIQUJ::, ECOLE DES MINES DE PARIS 35 RUE s·r HONORE, 77305 FONTAINEBLEAU, FRANCE

Mr J. TRAVASSOS, CVRM I.S.T., AV ROVISCO PAIS, 1096 LISBON CODEX PORTUGAL

Dr J.M.G.P. VALENTI::, PAULO ABIB ENGENHARIA S.A., RUA MARTIN E'RANClSCO 331/402, 30430 BELO HORIZONTE (MG), BRAZIL

Mr J. VAN HETEREN, ROAD AND HYDRAULIC ENGINEERING DIVISION, i:'.O. BOX 5044, 2600 QA DELFT, HOLLAND

Dr M. VAUCLIN, INSTITUT DE MECANIQUE DE GRENOBLE BP 68 38402 SAIN'r MARTIN D' HERES FRANCE

Dr G. VERLY, GEOMlNES LTEE, 300 RUE LEO PARISEAU SUITE 305 CP 1118 PLACE DU PARC, MONTREAL QUEBEC, CANADA H2W 2P4

Mr J .A. VlLOR!A, UNIVERSI'l'Y O.f OXFORD, DEP'l'. OF PLAN'l' SCIENCES, AGRICULTURAL SCI BUILDING PARKS ROAD, OXFORD, GREAT BRITAIN

Dr M. VOLT~, INRA SCIENCE DU SOL, PLACE VIALA, 34060 MONTPELLIER CEDEX, FRANCE

Mr A.G.W. VOORTMAN, GENCOR, P.O. BOX 61820, MARSHALLTOWN 2107, SOU'fH AFRICA

Dr H. WACKERNAGEL, CENTRE DE GEOSTATISTIQUE, ECOLE DES MINES DE PARIS 35 RUE ST HONORE, 77305 FONTAINEBLEAU, FRANCE

Dr V. WEBER, BERGBAU-FORSCHUNG GmbH, FRAN~ FISCHER WEG 61 4300 ESSEN 13, WEST GERMANY

UST OF PARTICIPANTS

Dr R. WEBSTER, ROTHAMSTED EXPERIMENTAL STATION, HAR~ENDEN, HERTS GKEA"r HKI"l'AlN

Ml: G. 1. woou I 44 St ANNJ::S KOAlJ I HJ::AlJlNGLJ::Y I LJ::EOS 156 3WX GREAT BRI'rAIN

Prof. D. YOUNG MICHIGAN TECHNOLOGICAL UNIVERSITY, MINING ENGINEERING UJ::PAN.'l"MEN"l' HOUGH'l'ON Ml 49931, U.S.A.

xxix