Engineering
MEM 501 San Diego State University Surface Mining Questions

MEM 501

San Diego State University

MEM

### Question Description

I need an explanation for this Engineering question to help me study.

MEM 501 – Fundamentals of the Mineral Industry

Module 4-1 Assignment – Surface Mining

(50 points)

Using Chapter 16 of the 2015 Corani Project 43-101 Technical Report, answer the following questions

1. Read Section 16.8 – Mining Equipment, and answer the following questions. (10 points)
1. What density was used for ore and waste?
2. What swell factor was assumed?
3. Calculate the loose density for ore and waste.
4. Answer questions a-c using the density for bofedal soils.
2. In Section 16.8.1 – Drilling (10 points)
1. Why do the authors recommend leasing drills?
2. Using the burden and spacing values provided and the density for ore, calculate the tonnage per hole based on this design.
2. Under what conditions would you recommend choosing a different loader type?
4. In Section 16.8.3 – Hauling (20 points)
1. The authors recommend that the trucks be overhauled every 15,000 hours and replaced every 60,000 hours, how many times will the trucks be overhauled and replaced during the life of the operation using information given in Sections 16.8 and 16.11. Explain your answer.

Module 4-2 Assignment – Surface Mining

(50 points)

1. What is bucket fill factor (BFF)? Describe two factors that might impact the BFF value? (10 points)
2. What are some of the loading conditions, as described in the paper that might have a negative impact on production? What were some of the differences between in-pit loading conditions and conditions at the stockpile? (10 points)
3. What recommendations did the author provide to increase production? Do you agree with these recommendations? Why or why not? (10 points)

Scenario Questions

1. You are the general manager for a large copper mine in Chile. You have been tasked with increasing production by 5 percent over the next year. Think holistically when answering these questions, e.g., operations, maintenance, engineering, etc. (20 points)
1. What steps or systems would you implement to achieve a 5% increase?
2. Well, corporate just called and now they want a 25% increase in production…. what would you suggest?

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Fundamentals of Mineral Industry
Module 4-1 Assignment: Surface Mining
1. Read Section 16.8 – Mining Equipment, and answer the following questions.
a. Density for ore and waste = 2.35 tonnes/m3, Density of Bofedal = 1.49 tonnes/m3
b. Swell factor for ore and waste = 30%, Swell factor for Bofedal = 10%
c. Loose density = Bank + Swell
1. For ore & waste = 2.35 + (30%/100) = 2.65 tonnes/m3
2. For bofedal = 1.49 + (10%/100) = 1.59 tonnes/m3
2. In Section 16.8.1 – Drilling
a. At the beginning of any mining operation there is a high pre-stripping
requirement. Due to this requirement it is recommended to lease additional drills
with a short-term lease.
b. Using the burden and spacing values provided and the density for ore, calculate
the tonnage per hole based on this design.

Tonnage = Volume * Density
Volume = Bench * Nominal Burden * Spacing * Number of holes
1. For Ore and Waste:
Volume = (8m)(4.6m)(4.6m)(8 holes) = 1,354.24m3
Tonnage = 1,354.24m3(2.35 tonnes/m3) = 3,182.46 tonnes/m3
Tonnage per hole = 3,182.46/8 = 397.81 tonnes/m3
2. For bofedal:
Volume = (8m)(4.6m)(4.6m)(8 holes) = 1,354.24m3

Tonnage = 1,354.24m3(1.49 tonnes/m3) = 2,017.82 tonnes/m3
Tonnage per hole = 2,017.82/8 = 252.23 tonnes/m3
Loaders and CAT 992 high lift loaders. The reasoning behind these choices stems
from the bucket capacity and maneuverability. The CAT 994 loader has a
capacity of 18m3, which can move large amounts of material. The CAT 992
tailings. The wheel loaders have increased maneuverability, which is convenient
with multiple mining areas.
4. In Section 16.8.3 – Hauling
a. The authors recommend that the trucks be overhauled every 15,000 hours and
replaced every 60,000 hours, how many times will the trucks be overhauled and
replaced during the life of the operation?

Mine production operates 24 hour/day, 7days/week and 350 days/year
Mechanical Availability = 85%
Use of Availability = 95%
Total trucks = 21 (16 for 19 years, 5 for 2 years)
Total mining hours in 1 year = 24 hours/day * 350 days/year = 8400 hours
per year
Life of operation for 16 trucks = 19 years
Total hours for lifetime = 16*19*8400= 2,553,600 hours
Life of operation for 5 trucks = 2 years

Total hours for lifetime = 5*2*8400 = 84,000 hours
Total for 21 trucks = 2,553,600 + 84,000 = 2,637,600 hours
Mechanical Availability = 2,637,600(.85) = 2,241,900
Use of Availability = 2,241,900(.95) = 2,129,862
Times truck overhauled = 2,129,862/15,000 = 142
Times truck replaced = 2,129,862/60,000 = 35.5
Module 4-2 Assignment: Surface Mining

1. What is bucket fill factor (BFF)? Describe two factors that might impact the BFF value?

The bucket fill factor is a me...

j_alexander (776)
Purdue University
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