Publicado

2013-03-01

GRADE CONTROL IN A QUARTZ DEPOSIT USING UNIVERSAL FUZZY KRIGING

Palabras clave:

Universal kriging, fuzzy number, quartz quality, 3D model, selective mining (es)

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Autores/as

  • ÁNGELES SAAVEDRA GONZÁLEZ Departmento de estadística, Universidad de Vigo
  • CELESTINO ORDÓÑEZ GALÁN Departamento de Explotación de Minas, Universidad de Oviedo
  • JAVIER TABOADA CASTRO Departamento de recursos naturales, Universidad de Vigo,
  • EDUARDO GIRÁLDEZ PÉREZ Departamento de recursos naturales, Universidad de Vigo,
  • CARLOS SIERRA FERNÁNDEZ
We adapt the universal kriging method of prediction to contexts with uncertainty and imprecise data. Using fuzzy set theory,
we develop a fuzzy universal kriging that we use to estimate quality classes for a quartz deposit. The method models the trend in the data
by linearly combining functions that depend on the coordinates for each point, which are fuzzy numbers. The spatial dependence between
the data is determined by means of non-fuzzy covariograms. The proposed method provides fuzzy numbers and non-fuzzy variances at
unsampled locations. Finally, the estimated fuzzy numbers are translated back into quartz qualities and graphically represented. From the
grade model obtained by using fuzzy kriging it has been possible to perform selective mining at the deposit depending on market demand
of the four products exploited.

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