Question $1$: $(35$ Marks$)$

You need to monitor the ground vibration and airblast some $230$ m from a blast at a farmhouse

in the Mokopane area, Limpopo Province. The blast parameters are as follows:

Burden $=5\mathrm{.}2m,$ spacing $=6m,$ bench height $=10m,$ hole diameter $=172mm,$ sub$-$drill $=1\mathrm{.}0m,$

explosives density $=1\mathrm{.}15\frac{g}{c}c,$ stemming length $=2\mathrm{.}4m$ and the timing $=42$msec inter row,

and $100$ msec intra row, closed V $1$ chevron. The free face is towards the north and the

farmhouse is situated to the southwest behind the blast.

Discuss $($with suitable diagrams$)$ how and where you would anchor the sensor of the

seismograph and at what setting would you set the trigger levels. Furthermore, discuss the

documentation required and what you would complete prior to and after the blast. How would

you test the seismograph prior to the blast?