英文關鍵字
benefication
classification
classifier
classifying
concentrate
concentration
department
dressing
economics
enriching
enterprise
extraction
fabricator
factory
gravitate
grinder
grinding
heavy
iron
manufactory
manufacturing
metal
metallurgy
mill
mineral
mining
operation
ore
picking
plant
processing
production
rocks
screen
separation
shop
sizer
sizing
smelting
treatment
unit
wash
work
workshop