Visitor Induction

Buckles Nordic: 1957 – 1968

12 M tonnes; 114.2 ha

Pronto: 1958 – 1970

4.4 M tonnes; 44.7 ha

Panel: 1958 – 1961; 1979-

199016 M tonnes; 130.5

haStanleigh:

1958 – 1960; 1983-1996

20.5 M tonnes; 370 ha

Quirke: 1956 – 1961; 1968-

199220.5 M tonnes;

183.5 ha

Spanish-American: 1958 – 1959

0.45 M tonnes; 12.3 ha

Milliken: 1958 – 1964

0.08 M tonnes; 23.1 ha

Lacnor: 1957 – 1960

2.7 M tonnes; 31.4 ha

Denison: 1957-1992

63 M tonnes; 280 ha

Stanrock: 1958-1983

5.7 M tonnes; 52 ha

Mine Closure ObjectivesPhysical Stability• Human Health and Safety• Dam Safety• Land Use

Chemical Stability• Water resource protection• Health• Biodiversity

Land Use and Aesthetics• Community Expectations• Post Closure Land Use• Regulatory Requirements

Design CriteriaArea Criteria

Static Factor of Safety 1.5

Meet Canadian Dam Safety Guidelines based on hazard potential classification of containment structure

Provide adequate water storage to prevent loss of water cover

Meet Canadian Dam Safety Guidelines based on hazard potential classification of containment structure

Objective of radium-226 average annual loading of < 100 Bq/s

Meet Provincial Surface Water Quality Objectives (PWQOs) in receiving waters

Meet worker dose limit (currently 50,000 µSv/y)

Meet public dose limit (currently 1,000 µSv/y)1

Objective limit of <50 µSv/y from decommissioned facility

Keep environmental impacts and doses to receptors as low as reasonably achievable (ALARA)

Land Use Allow a productive land use or acceptable alternative

Perimeter Dam Stability

Hydraulic Design

Effluent Discharges

Dose Limits

Flooded Tailings

• Water and tailings retained by impermeable dams prevents generation of acid

• Surface water will continue to be collected and treated until water cover meets discharge criteria without treatment

Water Cover

Tailings

Overburden

Bedrock

Dam

Panel Quirke

Stanleigh Denison TMA-1

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Vegetated Tailings

• Rain and oxygen enter top layer of tailings and generate acid

• Water passes through permeable dam (e.g. Nordic) and is collected in drainage ditch at toe of dam.

• Seepage collected in toe drain will continue to be treated for quite some time

Tailings

Overburden

BedrockDam

Vegetation

Lacnor Nordic

Pronto Stanrock

Operating, Care and Maintenance

Site Maintenance

Plant Maintenance

Storm Event Inspection

Snow Removal & Access

Beaver Monitoring & Control

Performance Monitoring

Community Relations

Operations Monitoring

Competition Ground Rules

• General• In order to comply with competition regulations and standards, information

provided during the presentations and site tours is restricted to that available in the public domain

• Everyone should feel free to put a halt to a conversation if he or she feels that a conversation or information exchange is venturing into dangerous territory

• Any objection to the sharing of potentially sensitive information during this meeting will be noted in the company meeting notes

• Specific• Avoid sharing information that could be used to disadvantage those who may

supply goods or services to two or more of the participating organizations (e.g. names of potential contractors, planned timing of major procurement efforts, information regarding labour relations, labour market conditions, etc.)

• Avoid sharing information that could be used to disadvantage those who may purchase products from two or more of the participating organizations (e.g. production capacity or forecasts, sales or shipping volumes, marketing plans or projections, market conditions, etc.)

Site Specific Hazard Awareness• Mine sites have undergone closure and reclamation to achieve

o A safe and stable physical condition;

o Environmental compliance with no adverse environmental impact;

o Restoration to a condition commensurate with surrounding land use;

o Minimize active maintenance and monitoring requirements.

• This is not the same as an operating mine

o Mine reclamation is aimed at restoring natural conditions and blending in with the surroundings. Drive and walk accordingly, recognizing natural conditions of topography, rivers, lakes and seasonal ice and water.

o The sites may not be closed to pedestrian access and travel to site may be along isolated public roads frequently used by pedestrians.

o Primary roads are maintained for access to operating areas. Some roads are seasonal access only. There are uncontrolled intersections on the property.

o Underground mine openings have been closed and capped. There has been historic subsidence into underground workings (Buckles and Pronto) with potential for subsidence identified at Quirke and Nordic. Potential subsidence will occur at depth; areas are signed to restrict public access.

o Facilities include flooded basins, drainage ditches and settling ponds. There is a net positive water balance at all sites, thus water levels in basins and flows in ditches can vary significantly.

o The tailings are net acid generating and basin overflows and drainages may be treated with lime, thus some site ponds and drainage ditches can be acidic or alkaline.

Site Tour General Safety

• Participants must remain within visual contact of tour representative at all times.

• There are no sanitary facilities on the bus or at the sites.

• Sturdy foot wear and clothing appropriate for the weather conditions are required.

• Report any incidents or accidents to tour leader immediately.

• Do not leave any debris except in appropriate containers.

• Anyone under the influence of drugs or alcohol will be removed from the property immediately.

• Photos are allowed – but only for personal or professional use; no publication in any form of media for non-regulatory purposes without prior written approval of Denison or Rio Algom.

Tour Tailings Management Area Safety

• Bears – especially on vegetated tailings; attracted to clover

• Do not approach or stray onto slopes of dams.

• Vegetated tailings surfaces are uneven and contain some rocks; please stay on roadway surfaces and watch your footing.

• Sites are decommissioned uranium mining facilities; tailings contain low levels of radioactivity – do not remove any material from the site.

Tour Effluent Treatment Plant Safety

• Lighting at plants is low until warmed up; if entering plant, wait for clearance from tour guide and allow time for your eyes to adjust to reduced light.

• Do not make any adjustments to any plant monitoring or treatment functions.

• Plants are designed for remote operation with limited number of people; please work cooperatively to avoid crowding in doorways and stairwells.

• Do not climb on or over barricades or railings.

• Hazardous materials are contained in tanks or on designated storage pallets; do not touch reaction tank addition streams or stored materials.

Tour Radiation Safety

• The former mine sites have been decommissioned to minimize radiation hazards.

• Gamma radiation is marginally above background and your tour will result in a radiation dose less than a cross country flight.

• No material may be removed from the site.

• Do not disturb radiation mitigation measures: dams, water covers, vegetative covers, plant ventilation.

• Roads are surfaced with imported road materials that do not contain radioactive material therefore vehicles that do not come in direct contact with tailings or treatment solids do not have to be scanned prior to leaving the property.

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Radiation Dose Limit

• CNSC public dose limit 1.0 mSv/y

• Health Canada Guideline 0.3 mSv/y

• 0.016mSv 200 hours EL TMAs

• 0.04 mSv 7 hour flight New York to Paris

• 0.24 mSv difference in living at sea level or in Denver Co.

• 0.3 mSv Mammogram

• 1.4 mSv Lower GI Tract Exam

Natural Background3mSv

Medical Sources Less than1mSv

Living at Boundary of Nuclear StationLess than 0.05 mSv

Other Sources0.4 mSv

In Case of Emergency

• Remain calm.

• Inform tour leader of situation.

• Tour leader will contact emergency services as required and request assistance.

• Stay with group and follow instruction of tour leader.

• Emergency contact number for DES on-call operator is 705-461-0466.