Ask Question, Ask an Expert


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

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 ...

Project proposal -objectives to get more familiar with the

Project Proposal - Objectives: To get more familiar with the Hadoop Ecosystem (Spark specifically) and Scala Programming. Resources: Files of tweets about election Project Topic: The election of 2016 seems to be a very c ...

The presentation should cover the followingslide show give

The presentation should cover the following; Slide show Give information on structure Recalls on any appliances 4 questions you would want to ask the firefighters and homeowner hypothesis 10-15 minutes nfpa 921 worksheet ...

Electronics lab transistor biasing1given a bjt unloaded

Electronics Lab: Transistor Biasing 1. Given a BJT unloaded amplifier shown in figure 1 below with β=100. o Draw DC equivalent circuits of this unloaded amplifier. o Draw the DC load line of the circuit. o Determine the ...

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 ...

1given the following transfer function modelsy1su1s g11s

1. Given the following transfer function models: y 1 (s)/u 1 (s) = g 11 (s) = 2/(s+3) y 1 (s)/u 2 (s) = g 12 (s) = -1/(s+1) y 2 (s)/u 1 (s) = g 21 (s) = -1/(s+7) y 2 (s)/u 2 (s) = g 22 (s) = 0.5/(s+4) a) Draw the 2x2 ope ...

Technical memo based on a provided excel sheetsreport your

Technical MEMO based on a provided excel sheets Report your results to Dr. Robin Hood, Director of Applications Department, in a technical memo, no longer than 3 pages. Note that Dr. Hood has a strong background in fuel ...

Create the single line diagram of a substation having the

Create the single line diagram of a substation having the following equipments using a drawing software. You can use any drawing software available (e.g. Smartdraw, MS Visio, Microstation, AUTOCAD, Edraw etc.). -Incoming ...

Power flow project -figure 1 shows a single-line diagram of

Power Flow Project - Figure 1 shows a single-line diagram of a five-bus power system. Input data are given in Tables 1, 2, and 3. As shown in Table 1, bus 1 is the swing bus, to which a generator is connected. Bus 3 is a ...

Biomedical engineering modelling amp analysis assignment

Biomedical Engineering Modelling & Analysis Assignment - Aim and Learning Outcomes: To use appropriate software to solve a set of differential equations related to a topical engineering problem and use the solutions to m ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen