A mining company is planning to develop an open$-$pit limestone mine and will use a

Volvo EC $650$ ME excavator along with Volvo A$25$D mechanical drive rear dump haul

trucks for ore extraction. The truck's capacity is $15B{m}^3,$ which will be loaded with

limestone classified as excavation class $5.$ The material has a swell factor of $1\mathrm{.}3,$ and the

bank density is $2,200k\frac{g}{B}{m}^3.$ The trucks will operate on the same level as the excavator.

The excavator's bucket has a capacity of $4\mathrm{.}4m^3$ with a fill factor of $0\mathrm{.}75,$ and it is

operated by an experienced operator. The loader operates at a rate of $550L\frac{m^3}{h}r.$ The

loading time for the first bucket is $0\mathrm{.}15$ minutes, and $0\mathrm{.}4$ minutes for subsequent passes.

The haul distance from the excavation site to the processing plant is $2\mathrm{.}4$ km $,$ with the

following details:

Note: For travel time through curves, if the radius is more than $50$ m $,$ refer to line $5$ for

calculations.

The trucks will spend an average of $1\mathrm{.}4$ minutes maneuvering and dumping at the

processing plant. The spot time at the excavator is $12$ seconds, with an additional $0\mathrm{.}35$

minutes allocated for other planned activities. Unavoidable job delays are expected to

average $1\mathrm{.}55$ minutes per cycle.

What is the estimated hourly production of a truck?

Determine the number of trucks required for the ore handling fleet.

Given that the hourly operating costs are $$140/$hour for the loader $($with operator$)$

and $$110/$hour for the truck $($with operator$),$ calculate the unit costs.

Provide detailed calculations, the necessary highlighted charts and update the site

form as required.

Compare the results if Volvo A$30$D mechanical drive rear dump haul trucks with

a capacity of $17\mathrm{.}5B{m}^3$ are used instead, keeping the same excavator. Provide all

required steps, and comment on the results. There is no need to submit charts or

the site form for this part of the task.

Submission:

Include a written summary of your findings, detailing the basic steps you followed to ar

Travel time through curves with different length and radius.

Travel time at different total resistance and ground structure $-$ Volvo A$25$D$,$ unloaded.

Jotal resistence

Travel time at different total resistance and ground structure $-$ Volvo A$30$D$,$ loaded

bod resstrice

Groud stucmerive at your answers.

Submit your work to D$2$L by Sun, Oct $6^{th},2024,$ before $11$:$59$ PM $($Midnight$).$

Ensure your submission is neat and well$-$organized. Upload the completed assignment to the D$2$L Dropbox in PDF format. The filename should include your name, e$.$g$.,$ Assg$1\_$YourName.

Marks will be allocated based on the accuracy of your solution and the professional presentation of your work, including comments and graphs that demonstrate your engineering judgment.

Travel time at rifferent that resistanes and nme ind strietime $-$ Volun $\frac{?}{{?}_{\frac{?}{?}}25n}$ Inarled