TY - CHAP
T1 - Building a Tonnage-Surface Function for Metal Grades and Geological Dilution: An Application to the Massive and Stockwork Zambujal Ore Deposit, Neves-Corvo Mine, Portugal
AU - Silva, David
AU - Almeida, José António
N1 - info:eu-repo/grantAgreement/FCT/5876/147458/PT#
PY - 2017
Y1 - 2017
N2 - Classical metal tonnage cut-off curves are an important output of mineral deposit evaluation. However, such curves omit local morphological variations such as those found in sulphide stockwork-type deposits, in which sulphides and host rock exhibit variable proportions. This paper presents a methodology for building a stochastic model of the massive and stockwork Zambujal ore deposit with respect to both morphology and metal content. The model allows a metal tonnage cut-off surface to be constructed conditional both to metal content and to local proportions of sulphides relative to host rock. Two random variables are modelled using stochastic simulation: (i) a variable (P(x)) that represents the local proportion of sulphides within each mining block and (ii) an auxiliary variable (Y(x)) representing the relative contents of metal, that is, the metal contents recalculated for the matrix sulphides. The results are validated by comparing the global quantities obtained using ordinary kriging of the effective grades with those obtained by modelling the variables P(x) and Y(x).
AB - Classical metal tonnage cut-off curves are an important output of mineral deposit evaluation. However, such curves omit local morphological variations such as those found in sulphide stockwork-type deposits, in which sulphides and host rock exhibit variable proportions. This paper presents a methodology for building a stochastic model of the massive and stockwork Zambujal ore deposit with respect to both morphology and metal content. The model allows a metal tonnage cut-off surface to be constructed conditional both to metal content and to local proportions of sulphides relative to host rock. Two random variables are modelled using stochastic simulation: (i) a variable (P(x)) that represents the local proportion of sulphides within each mining block and (ii) an auxiliary variable (Y(x)) representing the relative contents of metal, that is, the metal contents recalculated for the matrix sulphides. The results are validated by comparing the global quantities obtained using ordinary kriging of the effective grades with those obtained by modelling the variables P(x) and Y(x).
U2 - 10.1007/978-3-319-46819-8_25
DO - 10.1007/978-3-319-46819-8_25
M3 - Chapter
SN - 978-3-319-46819-8
T3 - Quantitative Geology and Geostatistics
SP - 371
EP - 381
BT - Geostatistics Valencia 2016
A2 - Gómez-Hernández, J. Jaime
A2 - Rodrigo-Ilarri, Javier
A2 - Rodrigo-Clavero, María Elena
A2 - Cassiraga, Eduardo
A2 - Vargas-Guzmán, José Antonio
PB - Springer International Publishing
CY - Cham
T2 - 10th International Geostatistical Congress
Y2 - 5 September 2016 through 9 September 2016
ER -