Sensitivity Analysis of Effective Parameters in Borehole Failure, Using Neural Network

Table 2

Westerly granite mineral compositions [43].

Mineral type	Volume in percentage
Quartz	27.5
Microcline	34.4
Plagioclase	32.4
Muscovite	1.3
Biotite	3.2
Opaque accessories	0.8
Other accessories	0.4