ISO 21795-2:2021

Mine closure and reclamation planning — Part 2: Guidance

This document provides guidance related to the necessary mine closure and reclamation planning activities for new and operating mines. Recommendations are provided on: — closure and reclamation of a mine site; — land reclamation and water management; — stakeholder engagement; — decision and analysis tools. The following aspects of closure and reclamation are not addressed in this document: — infrastructure such as rail lines, ports, off-site ore loaders, power stations, etc. that are associated with the mine operation, but which are not located at the mine site; — detailed survey, testing or monitoring methods, detailed engineering procedures, detailed product requirements, or detailed construction and operational procedures; occupational health and safety management related to closure and reclamation, construction and exploration activities; — relinquishment of a closed and reclaimed mine site, or portions thereof, to a party (governmental or private entity) not related to the mine operator; — specific requirements for dealing with the radiological aspects of mine closure and reclamation, such as those that occur at uranium mining and processing facilities and other mines at which naturally occurring radioactive materials are present; however, the other aspects associated with closure and reclamation of these mines are included in this document; and — closure and reclamation of abandoned mines.

Planification de la fermeture et de la restauration des mines — Partie 2: Recommandations

General Information

• Status: Published
• Publication Date: 05-Oct-2021
• ICS: 73.020 - Mining and quarrying
• Technical Committee: ISO/TC 82/SC 7 - Mine closure and reclamation management
• Drafting Committee: ISO/TC 82/SC 7 - Mine closure and reclamation management
• Current Stage: 6060 - International Standard published
• Start Date: 06-Oct-2021
• Due Date: 07-Jan-2022
• Completion Date: 06-Oct-2021

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21795-2
First edition
2021-10
Mine closure and reclamation
planning —
Part 2:
Guidance
Planification de la fermeture et de la restauration des mines —
Partie 2: Recommandations
Reference number
ISO 21795-2:2021(E)
© ISO 2021

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ISO 21795-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2021 – All rights reserved

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ISO 21795-2:2021(E)
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Closure and reclamation of a mine site . 2
4.1 General . 2
4.2 Tailings storage facilities. 2
4.2.1 General . 2
4.2.2 Objectives . 2
4.2.3 Approach . 3
4.2.4 Status and condition assessment . 3
4.2.5 Risk assessment . 4
4.2.6 Closure and reclamation alternatives analyses . 4
4.2.7 Closure and reclamation plan . 5
4.3 Water storage facilities . 6
4.3.1 General . 6
4.3.2 Objectives . 6
4.3.3 Approach . 7
4.3.4 Status and condition assessment . 7
4.3.5 Risk assessment . 7
4.3.6 Closure and reclamation alternatives analyses . 8
4.3.7 Closure and reclamation plan . 8
4.4 Waste rock dumps . 9
4.4.1 General . 9
4.4.2 Objectives . 9
4.4.3 Approach . 9
4.4.4 Status and condition assessment . 10
4.4.5 Risk assessment . 11
4.4.6 Closure and reclamation alternatives analyses . 11
4.4.7 Closure and reclamation plan .12
4.5 Heap leach facilities. 12
4.5.1 General .12
4.5.2 Objectives .13
4.5.3 Approach . 13
4.5.4 Status and condition assessment . 13
4.5.5 Risk assessment . 14
4.5.6 Closure and reclamation alternatives analyses . 14
4.5.7 Closure and reclamation plan . 15
4.6 Open pits . 16
4.6.1 General . 16
4.6.2 Objectives . 16
4.6.3 Approach . 16
4.6.4 Status and condition assessment . 16
4.6.5 Risk assessment . 17
4.6.6 Closure and reclamation alternatives analyses . 17
4.6.7 Closure and reclamation plan . 18
4.7 Underground workings . 20
4.7.1 General .20
4.7.2 Objectives .20
4.7.3 Approach . 20
4.7.4 Status and condition assessment . 20
4.7.5 Risk assessment . 21
iii
© ISO 2021 – All rights reserved

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ISO 21795-2:2021(E)
4.7.6 Closure and reclamation alternatives analyses . 21
4.7.7 Closure and reclamation plan . 21
4.8 Mine infrastructure . 24
4.8.1 General . 24
4.8.2 Objectives . 24
4.8.3 Approach . 24
4.8.4 Status and condition assessment . 24
4.8.5 Risk and opportunity assessment . 25
4.8.6 Closure and reclamation alternatives analyses . 25
4.8.7 Closure and reclamation plan . 26
4.9 Temporary closure . 27
4.9.1 General . 27
4.9.2 Objectives . 27
4.9.3 Status and condition assessment .28
4.9.4 Risk and opportunity assessment .28
4.9.5 Closure and reclamation alternatives analyses .28
4.9.6 Closure and reclamation plan .28
5 Land reclamation and water management .29
5.1 Landforms .29
5.1.1 General .29
5.1.2 Objectives .29
5.1.3 Approach .29
5.1.4 Plan .30
5.2 Surface preparation . 30
5.2.1 General .30
5.2.2 Objectives .30
5.2.3 Approach . 31
5.3 Vegetation establishment . 32
5.3.1 General . 32
5.3.2 Objectives . 32
5.3.3 Approach . 33
5.3.4 Evaluating site conditions for revegetation: . 33
5.3.5 Selection of revegetation approaches .34
5.3.6 Revegetation plan . 35
5.3.7 Monitoring and adaptive management . 35
5.4 Water management .36
5.4.1 General .36
5.4.2 Objectives . 36
5.4.3 Approach . 36
5.4.4 Water management plan .38
5.5 Water treatment .39
5.5.1 General .39
5.5.2 Objectives . 39
5.5.3 Approach . 39
5.5.4 Design .40
5.5.5 Operations and maintenance .40
5.6 Covers . 41
5.6.1 General . 41
5.6.2 Objectives . 41
5.6.3 Cover design . 42
5.6.4 Modelling and field testing . 43
5.6.5 Monitoring and maintenance aspects specific to covers . 43
5.6.6 Consideration of climate zones . 43
5.6.7 Objectives .44
5.6.8 Wet and tropical climates .44
5.6.9 Arid climates .44
5.6.10 Cold climates .44
5.6.11 Temperate climates . 45
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ISO 21795-2:2021(E)
5.7 Climate change effects . 45
5.7.1 General . 45
6 Stakeholder engagement .46
6.1 General .46
6.2 Objectives . 47
6.3 Approach . 47
6.3.1 General . 47
6.3.2 Stakeholders identification .48
6.3.3 Special rights holders .48
6.3.4 Indigenous peoples .49
6.3.5 Stakeholder mapping .49
6.3.6 Engagement methods .49
6.3.7 Response program .49
6.3.8 Social transition — Post-closure and reclamation stakeholder agreements .49
6.3.9 Engagement plan . 50
6.3.10 Engagement and reporting frequency .50
7 Decision and analysis tools.50
7.1 Design levels .50
7.1.1 General .50
7.1.2 Objectives .50
7.1.3 Approach .50
7.1.4 Conceptual design level . 51
7.1.5 Pre-feasibility design level . 51
7.1.6 Feasibility design level . 51
7.1.7 Detailed design level . 52
7.1.8 As-built documentation. 52
7.1.9 Application of design levels to mine closure and reclamation planning . 52
7.2 Alternatives identification and analysis . 53
7.2.1 General .53
7.2.2 Objectives .53
7.2.3 Approach . 53
7.2.4 Technology screening .54
7.2.5 Options screening .54
7.2.6 Options analysis . 55
7.2.7 Stakeholder engagement .56
7.2.8 Documentation.56
7.3 Designing and operating for closure and reclamation. 57
7.3.1 General . 57
7.3.2 Objectives . 57
7.3.3 Approach . 57
7.3.4 Design criteria .58
7.3.5 Documentation.58
7.4 Risk assessment and management . 59
7.4.1 General . 59
7.4.2 Objectives . 59
7.4.3 Approach .
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21795-2
ISO/TC 82/SC 7
Mine closure and reclamation
Secretariat: KATS
planning —
Voting begins on:
2021-07-13
Part 2:
Voting terminates on:
Guidance
2021-09-07
Planification de la fermeture et de la restauration des mines —
Partie 2: Lignes directrices
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 21795-2:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2021

---------------------- Page: 1 ----------------------
ISO/FDIS 21795-2:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 21795-2:2021(E)

Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Closure and reclamation of a mine site . 2
4.1 General . 2
4.2 Tailings storage facilities . 2
4.2.1 General . 2
4.2.2 Objectives . 2
4.2.3 Approach . 3
4.2.4 Status and condition assessment . 3
4.2.5 Risk assessment . . 4
4.2.6 Closure and reclamation alternatives analyses . 4
4.2.7 Closure and reclamation plan . 5
4.3 Water storage facilities . 6
4.3.1 General. 6
4.3.2 Objectives . 6
4.3.3 Approach . 7
4.3.4 Status and condition assessment . 7
4.3.5 Risk assessment . . 7
4.3.6 Closure and reclamation alternatives analyses . 8
4.3.7 Closure and reclamation plan . 8
4.4 Waste rock dumps . 9
4.4.1 General. 9
4.4.2 Objectives . 9
4.4.3 Approach . 9
4.4.4 Status and condition assessment .10
4.4.5 Risk assessment . .11
4.4.6 Closure and reclamation alternatives analyses .11
4.4.7 Closure and reclamation plan .12
4.5 Heap leach facilities .12
4.5.1 General.12
4.5.2 Objectives .13
4.5.3 Approach .13
4.5.4 Status and condition assessment .13
4.5.5 Risk assessment . .14
4.5.6 Closure and reclamation alternatives analyses .14
4.5.7 Closure and reclamation plan .15
4.6 Open pits .16
4.6.1 General.16
4.6.2 Objectives .16
4.6.3 Approach .16
4.6.4 Status and condition assessment .16
4.6.5 Risk assessment . .17
4.6.6 Closure and reclamation alternatives analyses .17
4.6.7 Closure and reclamation plan .18
4.7 Underground workings .20
4.7.1 General.20
4.7.2 Objectives .20
4.7.3 Approach .20
4.7.4 Status and condition assessment .20
4.7.5 Risk assessment . .21
© ISO 2021 – All rights reserved iii

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ISO/FDIS 21795-2:2021(E)

4.7.6 Closure and reclamation alternatives analyses .21
4.7.7 Closure and reclamation plan .21
4.8 Mine infrastructure .24
4.8.1 General.24
4.8.2 Objectives .24
4.8.3 Approach .24
4.8.4 Status and condition assessment .24
4.8.5 Risk and opportunity assessment .25
4.8.6 Closure and reclamation alternatives analyses .25
4.8.7 Closure and reclamation plan .26
4.9 Temporary closure .27
4.9.1 General.27
4.9.2 Objectives .27
4.9.3 Status and condition assessment .28
4.9.4 Risk and opportunity assessment .28
4.9.5 Closure and reclamation alternatives analyses .28
4.9.6 Closure and reclamation plan .28
5 Land reclamation and water management .29
5.1 Landforms .29
5.1.1 General.29
5.1.2 Objectives .29
5.1.3 Approach .29
5.1.4 Plan .30
5.2 Surface preparation .30
5.2.1 General.30
5.2.2 Objectives .30
5.2.3 Approach .31
5.3 Vegetation establishment .32
5.3.1 General.32
5.3.2 Objectives .32
5.3.3 Approach .33
5.3.4 Evaluating site conditions for revegetation: .33
5.3.5 Selection of revegetation approaches .34
5.3.6 Revegetation plan.35
5.3.7 Monitoring and adaptive management .35
5.4 Water management .36
5.4.1 General.36
5.4.2 Objectives .36
5.4.3 Approach .36
5.4.4 Water management plan .38
5.5 Water treatment .39
5.5.1 General.39
5.5.2 Objectives .39
5.5.3 Approach .39
5.5.4 Design .40
5.5.5 Operations and maintenance .40
5.6 Covers .41
5.6.1 General.41
5.6.2 Objectives .41
5.6.3 Cover design .42
5.6.4 Modelling and field testing .43
5.6.5 Monitoring and maintenance aspects specific to covers .43
5.6.6 Consideration of climate zones .43
5.6.7 Objectives .44
5.6.8 Wet and tropical climates .44
5.6.9 Arid climates.44
5.6.10 Cold climates .44
5.6.11 Temperate climates .45
iv © ISO 2021 – All rights reserved

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ISO/FDIS 21795-2:2021(E)

5.7 Climate change effects .45
5.7.1 General.45
6 Stakeholder engagement .46
6.1 General .46
6.2 Objectives.47
6.3 Approach .47
6.3.1 General.47
6.3.2 Stakeholders identification .48
6.3.3 Special rights holders .48
6.3.4 Indigenous peoples .49
6.3.5 Stakeholder mapping .49
6.3.6 Engagement methods .49
6.3.7 Response program.49
6.3.8 Social transition — Post-closure and reclamation stakeholder agreements .49
6.3.9 Engagement plan .50
6.3.10 Engagement and reporting frequency .50
7 Decision and analysis tools .50
7.1 Design levels .50
7.1.1 General.50
7.1.2 Objectives .50
7.1.3 Approach .50
7.1.4 Conceptual design level .51
7.1.5 Pre-feasibility design level .51
7.1.6 Feasibility design level .51
7.1.7 Detailed design level .52
7.1.8 As-built documentation .52
7.1.9 Application of design levels to mine closure and reclamation planning .52
7.2 Alternatives identification and analysis .53
7.2.1 General.53
7.2.2 Objectives .53
7.2.3 Approach .53
7.2.4 Technology screening .54
7.2.5 Options screening .54
7.2.6 Options analysis . .55
7.2.7 Stakeholder engagement .56
7.2.8 Documentation .56
7.3 Designing and operating for closure and reclamation .57
7.3.1 General.57
7.3.2 Objectives .57
7.3.3 Approach .57
7.3.4 Design criteria .58
7.3.5 Documentation .58
7.4 Risk assessment and management .59
7.4.1 General.
...