MINN3013A - Underground and Surface Mining Methods Assignment

Assignment Task

1. Introduction

A mining company has obtained a mining right in terms of Section 22 of the Mineral and Petroleum Resources Development Act 28 of 2002 (MPRD Act) from the Department of Mineral Resources and Energy (DMRE) on 30 May 2018. The company plans to develop an underground mine using cut-and- fill mining methods ranging from depths of 600 m to 1200 m. A highly mechanised mine is being planned with a projected production rate of 4 Mtpa. An operational cycle of 12 hours per shift and two shifts per day for 360 days per year is planned with about 600 underground employees per shift. Your team is part of a Shaft Sinking Contracting Company which has won a tender to: Design the shaft layout for exploiting the orebody.

Select and equipe the shaft with appropriate conveyances needed to meet operational Sink the shaft/s (including shaft station construction, shaft development and shaft equipping)ing

Figure 1: Location of mining project (Stantec, 2017)

The mining area is in a broad valley on flat terrain with the elevation increasing from 1,040 metres above mean sea level (mamsl) in the south-western corner to 1,370 mamsl on the ridges in the north-eastern corner of the lease area.
Figure 2 shows the stratigraphy of the area. T1, T2U and T2L are the economic mineralised zones which are flat to gently dipping at an average thickness of 30 m and a strike length of 6 km. The average

2. Report

• The aim of this project is to produce a technical report outlining the optimal:
• Design of the shaft layout for exploiting the orebody.
• Selection of the appropriate types and sizes of conveyances required to mine the orebody.
• Shaft sinking methods to be used to access the orebody and provide services to mining.
• For MINN3013A students only: Design of primary and secondary-access-developments.

The project assesses your ability to use and apply the skills and knowledge learnt in Unit 2.1 and Unit 2.2. of this course to a real mining case study to select and design an optimal underground mining access system. Where appropriate, you may make necessary assumptions. All sources must be referenced.

3. Design of the shaft layout for exploiting the orebody

In the design of the shaft layout system, determine the following and provide support for your selection:

The optimal number of shafts required to enable hoisting of the required daily production, fit mine services and guides, conveyances, secondary escape egress, personnel, and material transportation as well as ventilation. You must indicate the purpose of each shaft in the layout. Construct a basic 2D Magraph of a cross section showing the shaft locations with respect to the prebody. (For MINN3013A students, the cross section/s must show the primary and secondary development)

The locations of the shafts by evaluating design factors for shaft site location. Copy and paste

Figure 1 in your report and indicate the locations of each shaft in the layout.

• Optimal shaft shape, diameter and total depth that meets the operational requirements and physical environment. You must indicate these details for each shaft in the layout
• Type of headgear and winder. Where applicable, you must indicate these details for each shaft in the layout.

4. Selection of types and optimal sizes of conveyances

In the selection of the types and optimal sizes of conveyances, you will need to answer the following questions:

Hoisting of ore and waste:

What will you use to hoist ore and waste out the mine? What will be the hoisting speed of the conveyances used? What would be the maximum payload of the conveyances? What would be the maximum hoisting capacity per hour? How many will you use? How many hours will be required for hoisting to meet production targets? Will your selection meet the daily production requirement? Where would you source the conveyances and how much will they cost?

Transportation of personnel and material:

What will you use to transport people and material in and out of the mine? What sizes will these conveyances be? What will be the hoisting speed of the conveyances? How many will you use? Will they meet the operational requirement? Where will you source the conveyances and how much will they cost?

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