QUESTION $1$

$1\mathrm{.}1.$ Define flameproof enclosures and intrinsic safety in the context of coal mining.

Explain how each method prevents the ignition of methane$/$air mixtures.

$(8$ Marks$)$

$1\mathrm{.}2.$ Demonstrate with Diagrams the Design of Flameproof Enclosures. $(6$ Marks$)$

$1\mathrm{.}3.$ Decide between flameproof enclosures and intrinsically safe equipment for a

hypothetical new coal mining operation. Justify your recommendation by

comparing the safety, maintenance requirements, operational flexibility, cost,

and compliance with safety standards for both options. $(10$ Marks$)$

Subtotal $=24$ Marks

QUESTION $2$

You are the newly appointed Fleet Manager at Arise Mining Ltd$.,$ which operates an

open$-$pit copper mine. The mine is currently using a mixed fleet of excavators, haul

trucks, and dozers. The goal is to optimize the production fleet to improve efficiency

and meet the mine's production targets.

Given Data:

The mine has the following equipment:

o Excavators: $3$ units with capacities of $10$ m$,12$ m$,$ and $15$ m$.$

o Haul Trucks: $5$ units with capacities of $60$ tons, $70$ tons, $80$ tons, $90$ tons,

and $100$ tons.

The current production target is to move $50,000$ tons of ore per day.

The average loading time per truck is $20$ minutes, and the average haul cycle

time is $60$ minutes.

Each excavator works $16$ hours per day, and each haul truck operates for $24$

hours per day.

$2\mathrm{.}1.$ Based on the given data, describe the criteria you would use to select the

optimal equipment for the production fleet. $(6$ Marks$)$

$2\mathrm{.}2.$ Develop a manual scheduling plan for the production fleet to achieve the target

of moving $50,000$ tons of ore per day assuming a density of $2\mathrm{.}5$ tons$/$m $($typical for ore$)$ in your plan include: