ISO 21795-2:2021

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

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ISO/FDIS 21795-2:2021(E)

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ii © ISO 2021 – All rights reserved

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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
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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
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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.
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