Calculate required output by a single excavator

Reference no: EM13783457

Surface Mining Operations and Equipment Design Project

1. a. A pit with a straight ramp of 800m, with a gradient of 10%, supplies a ROM pad 1500m away via a level haul road all of loose gravel. Mining of a dipping ore body, with a specific weight of 2.5 t/m3, is required to be carried out at a rate of 10,000 tonnes/8 hour shift to feed the mill. Since truck speed is restricted to 50kmph, assume the average speed of a truck during a round trip is 45kmph, including reversing to load. Waste material of specific weight = 1.85 t/m3 is also to be mined, and deposited on a waste dump 200m from the pit. The waste dump already has a height of 10m, and an area of 100m x 60m from pre-stripped overburden. Excluding the overburden, the strip ratio is 1:4.5.

Other factors that are working assumptions are: Availability of excavator 83%,

Swell factor of 30% Bucket fill factor of 88% Excavator cycle time 45 seconds

Rolling Resistance Factor (RRF) = 15 kg/t

Coefficient of Friction, µ = 0.25

Grade Resistance Factor = 20 kg/t

(i) Calculate required output by a single excavator appropriate to this production and select an appropriate machine.

(ii) Calculate cycle times for trucks.

(iii) Calculate number and size of trucks.

(iv) Ensure trucks are capable of carrying out this mining safely.

List and justify your assumptions.

2. Working Bench.

Consider a mining sequence on a working bench.

a. Define the width of a working bench with a neat sketch.

b. Design a working bench when a single shovel of 6.8m3 capacity details of which are supplied in the notes with single spotting is used:

Given:

i. design bench height =15m

ii. shovel will move along one line parallel to the bench face

iii. bench face angle 65°

iv. parallel cut will be used with turn and back v. single spotting

vi. haulage by 50 tonne capacity truck

vii. truck width = 5.5m

viii. truck tyre rolling radius = 1.2 m ix. a safety berm is required

3) A Caterpillar 631 E tractor scraper has the following characteristics: Maximum heaped volume = 19.6 Bm³

Maximum payload = 34,000 kg

The material hauled is earth with a density of 1825 kg/Bm³

Rolling resistance is 40 kg/t and operating conditions are average with a job efficiency of 45 min/hour.

The haul route comprises of the following sections: Section 1 (200m) level-loading zone

Section 2 (1000m) 5% down grade Section 3 (150m) level dumping zone Section 4 (1000m) 5% up grade Section 5 (50m) level turnaround area.

Estimate the machines production under these conditions using the travel time curves given in the Caterpillar Performance handbook.

Design a spiral haul road system for the following surface mine:

i. pit consists of 8 benches

ii. bench height is taken as 15m=H

iii. crest-to-crest distance is 25m

iv. bench face angle is 50°

v. a haul road having a width of 30m and 7% (=G%) gradient will be added to the outside of the pit wall

Reference no: EM13783457

Questions Cloud

Summarize the essay importance of multicultural education : Summarize the essay "The Importance of Multicultural Education in Global Society" and the author's main argument.

The concept of a natural monopoly : Throughout this course the concept of a "Natural Monopoly" will be raised. Using your textbook and other official academic sources, research the issue of "Natural Monopoly." Write a 2-3 page paper (in addition to a cover page) describing what a "Na..

Develop theoretical knowledge and understanding : As you develop theoretical knowledge and understanding, you should apply what you are learning in this assignment, as well as, future assignments.

Identify which testimony is hearsay : You are the assistant special agent in charge (ASAC) of the Organized Crime Task Force. Identify which testimony is hearsay and likely to be inadmissible. Identify which testimony is privileged communication and which is not

Calculate required output by a single excavator : Calculate required output by a single excavator appropriate to this production and select an appropriate machine - calculate cycle times for trucks.

The impact of workplace bullying : Provide a review of the article. Describe the impact of workplace bullying on both the victims and the organization.

Ascribed social class position : Explain how an individual's ascribed social class position at birth may affect what Max Weber called life chances, or the ability of an individual to attain the following "good things" that a society values:

Strengths and weaknesses of each piece : Is there another possible explanation you can think of? Based on what you have read, what is your hypothesis? In other words, what is your explanation for the findings?

What would the major ethical perspectives say : If we were able to predict premeditated murders in the future by somehow scanning the minds of citizens, is this enough evidence to apprehend and take legal action against them? What would the major ethical perspectives say

User Account

All Pages