experience in mine remediation case study germany: … business...uranium mining and processing...
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Michael Paul
Wismut GmbH, 09117 Chemnitz, Jagdschänkenstraße 29
Experience in mine remediation
Case Study Germany: Uranium Mining
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Presentation Outline
Background
Remediation goals, approach, technologies
10 Lessons
Conclusion
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
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Background
1990, termination of production: East German U industry left behind
one of the most extensive legacies within the mining sector
“Wismut Act”: Foundation of Wismut GmbH in 1991
• Corporate purpose: Decommissioning and remediation of former uranium mining and processing facilities
• Federal Republic of Germany is sole owner
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
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World Uranium Production (1946-1990) in 103 t
1946 -1990, SDAG Wismut
major U supplier of Eastern
Block
Rigorous, irresponsible
operational philosophy
Part of defense sector
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Site setting
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Berlin
Germany
Former Mine
Former Processing Plant
WISMUT Head Office
Ronneburg Branch
Königstein Branch
Aue
Branch
Head Office
Climate moderate, humid
Mean annual precip. 700-1150 mm/a
Mean annual temperature 6-9 oC
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Project scope
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
3,700 ha operational areas
9 active deep mines w/ 100+ shafts, 1 open pit
2 processing plants
325 Mm3 mine waste, 60 waste dumps
160 Mm3 tailings, 10 TMF‘s
Significant radioactive and conventional emissions
Negative corporate image
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Remediation goals
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Secure public safety
Enable future land use
Ensure radiation protection standards
(Heff <1 mSv/a, incl. radon, action level and remediation goal)
Ensure ecological standards (water, air, soil, biota)
Tackle stigmatizing of regions affected by U mining
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Main Activities
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Dismantling of surface structures and site clean-up
Closure of underground mines and mine flooding
Safekeeping of solid mine waste, especially tailings
Effluent management
Environmental monitoring & Maintenance
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Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Remediation achievements
> 90 % of physical remedial work completed
Worldwide unique examples for after-use of former uranium mining areas
Achievement of radiological remediation objectives
Significant mitigation of residual contaminant transfer into environment
However, active aftercare measures required, mainly water
management
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Sustainability Principles *
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Reduce existing environmental impacts to a socially accepted and
reasonable level
Value-added reuse, promoting regional development
Robust remediation solutions requiring no or limited active after care
Maximum reuse of resources
Long-term availability of information and know-how, to support
institutional control and public awareness
Lesson 1
* to be applied at legacy/ abandoned mine sites, see WISSYM_2011
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Technical Planning & Supervision
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Site characterization and site-wide Conceptual Model (CSM)
Top-down approach, step-by-step implementation
EIA and cost benefit optimization
Use BAT (Best Available Technology), reflecting BEP
(Best Environmental Practice)
Adaption to site conditions
Strict on site construction supervision, based on appropriate
quality assurance (QA) programmes and adequate quality
control (QC)
Lesson 2
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Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Objectives
Definition of
remediation objectives
Criteria
Definition of
remediation
criteria and ways
to measure them
Options
Identification of
remediation options,
resources and process
optimization
Technology
Selection
Selection of
remediation
technologies
Implementation
Implementation of
the remediation plan
After-care
Monitoring/ post-
remediation
management
Lesson 3
1 2 3 4 5 6
All-time focus on over-all decision
making process
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Characterization
Base line and site
characterization
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Understanding and overcoming
key bottlenecks
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Responsibility and Financing
Permitting
• Critical shortage, long lead-time
• > 9,500 permits (2017)
• Establishment of specific management tools
Procurement
• ~ 50 % of funds contracted out
• General rule: Public procurement
• Long lead time for major investments and services
Lesson 4
In-House Labour:
50 %
Engineering, Transport,
construction: 22 %
Raw materials & supplies,
energy: 20 %
Investments: 8 %
Cost structure (1991-2015)
0
100
200
300
400
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600
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Applications Permits received
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Key assets:
Infrastructure and personnel
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
To partially act independently from market
To ensure institutional capabilities
Challenges:
• Personnel: Necessary workforce reduction vs. retaining key
qualifications
– Maintain a stable workforce at operator and management level
– Adaption to changing skill-sets, training, etc.
• Infrastructure: Remediation mandate („Dismantling“) vs. temporal
demand for remedial work
– Masterplan needed
Lesson 5
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Water management
Key relevance for mine closure projects, crucial pre-requisite
for proper and on-schedule project implementation
• Interdependence with all activities & aspects
• Large number of potential pitfalls
• Longevity of effects
• Key performance indicator for remediation success
• Key cost factor
Variability / extreme events challenge for long term rational decision making
(“the average does not exist”)
Misjudgements may lead to substantial delays, cost increase, loss of prestige
Holistic approach needed
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Lesson 6
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Mine flooding
Flooding w/ natural GW-inflow, stepwise, controlled, monitored
All five UG mines flooded to the maximum level possible
(‘Qualified high inundation level’)
• Suppress ongoing ARD generation & metal leaching
• Energy saving, but also minimization of GW inflow
• Triggering stratification and natural attenuation (NA)
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Lesson 7
Leaving mines “open/ unflooded” no valid option, due to running cost for
dewatering, ventilation, mine safety, etc.
Water treatment also necessary for dewatered status
2014, one fully-flooded UG mine released from active treatment
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Water treatment
Despite implementation of sophisticated encapsulation/cover strategies,
long-term water treatment inevitable at 6 out of 7 sites
Biggest long term burden
Main contaminants: U, As, Ra-226, Fe, other metals
Modified HDS lime precipitation
Adaption due to changes in flow rates and compositions, also increasing
demands regarding cleaning performance
Passive approaches did not meet design expectations
In-situ measures (source term control) have restricted applicability
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Lesson 7
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Gaining value from mine water
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
U recovery at one mine site, no longer economic
Some potential for Sc and REE (R&D), but key obstacles for full-scale
implementation
• Significant up-front and operating cost vs. restricted total mass
• Energy balance of production
• Lack of costumers of concentrates
• Conflicting trends with remediation (concentrations, fluxes)
• The “radiation label” is incredibly sticky
Value-added conditioning of residues technically not feasible/ uneconomic
Potential for recovery of geothermal energy very limited
Lesson 8
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Gaining value from former mine
land or tailings reprocessing
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Main after-use: Re-forestation, grass land
• Others: Small scale business, recreation, renewables
• Restricted after-use at sites with remaining contaminants
Some income from land purchase/lease, but only partially
compensating after-care cost
Why no tailings reprocessing?
• No net benefit (early attempts been dropped)
• Additional operational risks and emissions
• Tailings stay hazardous
• No alternative, safer storage site available
Lesson 9
Residential areas 1%
Industrial/ mixed use
8%
Public use 11%
Agriculture & Forest 11%
Agriculture & Forest, under
lease 14%
Wismut Property,
remediated 30%
Under remediation
25%
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Stakeholder involvement
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
Early and consistent stakeholder consultation key to success for
overall process
Overcoming conflicts with private or public landowners
Public expectations often driven by non-technical perceptions
Approach
• Transparency, in particular disclose of environmental data
• Trust and credibility, to be gained from the public
• Targeted involvement of key stakeholders (local municipalities, NGO’s)
Lesson 10
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What can WISMUT offer to the
International Mining Community ?
Internationally accepted benchmarking project for Mine Closure
and remediation of radioactive waste
• Proven & standardized technologies and workflows
• State-of-the-art approaches to EIA, Monitoring, Data & Know-how
management
• Well-documented case histories
• Multitude of knowledge sharing activities
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
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Conclusions
International benchmarking project for mine remediation
Balancing of ecological, economic and social interests
necessary for sustainable remediation solutions
Keys to success of the WISMUT programme:
• Strong and decisive political motivation
• Retaining valuable skills
• Immediate and stable funding
• Recognition of non-technical factors
Long term surveillance and monitoring (LTSM)
activitities necessary to ensure sustainability of
remediation results
Michael Paul Mine Remediation Case Study Germany, Uranium | Johannesburg, November 28-30, 2017
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We’ve done it.
Successfully.