Clipart tagged: ‘proving mineral field’
!["The principle of proving a mineral field by boring is illustrated in [the illustration], which represents a line direct from the dip to the rise of the field, the inclination of the strata being one in eight." -Britannica, 1910](https://etc.usf.edu/clipart/58700/58761/58761_proving-mine_mth.gif)
Proving Mineral Field
"The principle of proving a mineral field by boring is illustrated in [the illustration], which represents…
"The principle of proving a mineral field by boring is illustrated in [the illustration], which represents…