Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Other Engineering Expert

A gold mine has just completed mining waste pre-strip prior to commencing grade control mining. The waste rock was drilled and blasted for the pre-strip using 200mm diameter blast holes using a rotary blasthole drill and achieved a mining rate of 15,000 m3 per day. Blast parameters for the pre-strip were:

1. Blasthole burden         5.7m
2. Blasthole spacing        6.5m
3. Bench height               15m
4. Subgrade drilling         1.6m
5. Explosive                   ANFO        density 0.85 g/cc
6. Powder Factor        0.57 kg/m3

Fragmentation in the waste was acceptable for the excavators; these will be used for grade control mining as well as bulk waste mining. Grade control mining is to be undertaken using 115mm diameter holes to achieve sampling control; these will be drilled using a tophammer hydraulic drill. Bench height for grade control mining is to be 5m.

The waste rock has a density of 2,600 kg/m3, ore has a density of 3,200 kg/m3 due to sulphides and alteration minerals.

1. Scale down the waste blast parameters from 200mm to 115 mm diameter blastholes and determine explosive consumption in the waste and ore rocks.

Note: in addition to ANFO the full range of Heavy ANFO’s is available from the supplier.

2. Determine the drill metres required to achieve a production rate from grade control blasting of 6,000 m3/day

3. The penetration rate for the hydraulic drill is estimated to be 50m/hr. Determine the drill productivity based on one rod change that takes 30 seconds going down the hole and 45 seconds withdrawing it from the hole. In addition two samples are collected, this stops the drill for 30 seconds per sample and tramming between holes takes 1 minute 30 seconds.

4. Based on two 12 hour shifts per day, giving an effective 10.5 hours of drilling (assuming two 30 minute crib breaks and a 30 minute service period at the end of each shift) will one hydraulic drill be capable of the required production?

5. Based on the following accessory life find out the accessory requirements and cost:

Shank                              Life 600 m        Cost $130.00
Coupling                           Life 500 m        Cost $85.00
Drill Steel (3.6m length)     Life 1000m        Cost $230.00
Drill Bit                              Life 210m        Cost $165.00

6. find out the total drilling cost per m3 based on the following:

Drill fuel $9.50 per drill operating hour

Drill labour cost $22.00/shift hour

Drill maintenance $11.50/drill shift hour

Ownership cost $11.50/drill shift hour based on 20,000 hours working life

7. find out the total drill and blast cost based on the following blasting costs:

Explosives $550.00/tonne

Blast initiation $11.30/blasthole

Blast labour $80.00/tonne of explosive

Other Engineering, Engineering

  • Category:- Other Engineering
  • Reference No.:- M91763

Have any Question? 


Related Questions in Other Engineering

Assignmentthe purpose of an antenna in a radio transmitter

Assignment The purpose of an antenna in a radio transmitter is to launch the radio waves into space. In a receiver, the idea is to pick up as much of the transmitter's power as possible and supply it to the tuner. The si ...

1 summarise the steps in the development of an open pit

1. Summarise the steps in the development of an open pit mine. 2. Define or describe the following terms a. Bench height b. Working bench c. Crest d. Cut e. Toe f. Safety bench/catch bench g. Bench face angle h. Back bre ...

C project reportsi have two c program i need one reports

C++ Project Reports I have two C++ program i need one reports for ech one of the and i wnat them to be tn the same format in the instruction if there some the thing not right i will not accept it. The two must be diferen ...

1 simplify the expressions using boolean algebra and its

1. Simplify the expressions using Boolean algebra and its identities: X'Y + XYZ' + Y' + XZ (Y+Y') = 1 2. The academic director wants to select students in Sydney Study Center to give them Gala Dinner Award. The recipient ...

Robotics assignment-investigation into the control of an

Robotics Assignment- Investigation into the control of an electric motor using MatLab. An electric motor can be described by  the following two coupled second order differential equations, see the PowerPoint notes for a ...

Assignmentwhy program design is importantanswer the

Assignment Why Program Design is Important? Answer the following questions: 1. What is a program design? 2. Why program design is important? 3. What program design tools are available? Discuss in details by studying at l ...

The united states east to west water diversion

The United States East to West Water Diversion Project Background I was recently contacted by a concerned citizen in Naperville, Illinois with the following request: Dear Dr. Adam, I have written up an idea I've been thi ...

Life cycle and risk management assignment 4 a

Life Cycle and Risk Management Assignment 4: A workplace-based report This assessment task involves collaborative team arrangement efforts and designed to explore the key issues of risk management and how these issues ar ...

Smart home patient monitoring system abstractthe increasing

Smart Home Patient Monitoring System Abstract The increasing number elder people and illnesses that require continuous monitoring, along with the demand on hospital rooms and shortage of medical support, home monitoring ...

Discussion-please share with your classmates an experience

Discussion- Please share with your classmates an experience where you have dealt with lack of accommodation for the user in the design of equipment, process, or product. What was done to accommodate the user? Which anthr ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro