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V THE ESTIMATION OF IN SITU RESOURCES

the following subroutines of data classification (CLAS), of three-dimensional kriging(KRI3D), of linier

system solving(REALM and REITER) should be considered as initial elements of krigingof a kriging

package that must be constucted according to each practitioner's requirements.

Program CLAS

This program is designed for the classification of drill-hole data within a regular network ofparallelipedic blocks. The drill-holes are of any length and direction in the three-dimensional

space. For each block of the network and, according to the index, when INC = 1, the number

of distinct samples having their centre of gravity within the block is calculated. The

characteristics of each of these samples (cordinates, lenght of the sample, number of the

drill-hole from which it originates, mean grade, etc.) are then put into memory.

Thus for the block in Fig.21 wich is intersected by two drill-holes, two district samples arcconsidered on drill-hole no. 1, and four district samples on drill-hole no. 2. When INC = 0,

within each block the samples belonging to the same drill-hole are grouped, thus constitting

pieces of core originating from district drill-holes characteristics of these pieces of core are

put into memory.

Locating the block

All coordinates are referred to orthogonal axes parallel to the three main directions of theparallelepipedic network of block, cf Fig. V.22. The network is constituted of NX*NY*NZ=NB

blocks of identical sizzes. These blocks are numbered in standard matrix form (integer

coordinates IXC,IYC, IZC). The origin of the network, of coordinates XYZ(3), is located at the

centre of block no. NY(IYC=NY and IXC=IZC=1).

Each sample is defined on its drill-hole by the coordinates (XF, YF, ZF) end of the sample.

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Organization of the data file

Only the informed blocks (which contain at least one sample or piece of core) have amemory reservation on the file. The size of this memory reservation is given by the

parameter NIMB

maximum number of data per block; each datum being characterized bynine value ( the 2 x 3 coordinates of head and end of sample, the lenght of sample, the

number of the drill-hole and the mean grade); there are 9 x NIMB words reserved per block.

The location within the file of this memory reservation is read from the integer table NUM (NX, NY,

NZ), with 1

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