Henderson DUSEL Conceptual Design

1. Henderson DUSEL Conceptual Design Mark Kuchta Mining Engineering Department Colorado School of Mines Lee Petersen, CNA Consulting Engineers Greg Hulne, Miller Dunwiddie Architects Dale Holland, Dunham Associates John Jenkins, ILF Craig Covil, ARUP

2. Engineering Design Team Colorado School of Mines: Mark Kuchta, Scott Kieffer, (Mining Engineering, Geotechnical Engineering) Henderson Mine: Chip deWolfe, + Staff (Mining Engineering, Safety) CNA Consulting Engineers: Lee Petersen (Engineering Team Leader, Civil Engineering) Dunham Associates: Dale Holland (Mechanical/Electrical Engineering) Miller Dunwiddie Architecture: Greg Hulne (Architect) ILF Consultants: John Jenkins (Internal Shaft Design) ARUP: (Cost review, construction management plan)

3. Conceptual Design Overview • Shared Mine Infrastructure • Mine Services Summary • Rock Conditions • DUSEL Access Ramps • Campus Layouts (Upper, Central, Lower, Outposts) • Development Sequence • System Design • Fire and Life Safety Concepts and Code Review • Surface Facilities

4. Shared Mine Infrastructure • Overriding design criteria • Safety • Share infrastructure that is of benefit to share • Keep the DUSEL and mine operations as separate as possible

5. Site Overview

6. Shared Mine Infrastructure • Ventilation • 150,000 cfm available for DUSEL • Electricity • 14 MW with 14MW backup available for DUSEL. • Mine Dewatering • About 3000 gpm pumping capacity available for DUSEL • DUSEL estimated need 500 gpm • URAD Water Treatment • About 2000 gpm in excess capacity available for DUSEL

7. Shaft Schedule: Man Cage • Double Deck Man Cage • Capacity 100 people • Overall availability about 93.5% • Normally available 24/7 • Service Cage • Capacity 100 People • 30 Ton capacity • Sling 50 tons with crosshead • Cage – 23 ft. long X 8.5 ft • Wide X 13 ft high • Can move DUSEL supplies at 1140 tons/week to 7500 tons/week depending on shift schedule used. • (SNOLab: 336 tons/week)

8. Rock Handling System 80 ton trucks dump rock at crusher. Gyratory crusher reduces to –4 in. 1 mile PC1 and 10.5 mile long PC2 underground conveyors. 4 mile long PC3 surface conveyor to mill site. • 40,000 tons per day capacity • Mine currently producing about 30,000 tons per day • Maximum planned DUSEL production 3,000 tons per day • DUSEL rock will be dumped at the crusher on the 7065 level, • A fee ($/ton) will be charged for rock removal

9. Harrison Mountain Elev. 12,300 ft Red Mountain Elev. 12,300 ft Red Mountain Porphyry Silver Plume Granite Shaft Silver Plume Granite Henderson Orebody Urad Porphyry 1st Drill Hole Primos Porphyry 7500 Level 2nd Drill Hole 7065 Level Central Campus Elev. 6800 ft, (4300 mwe) Access Ramps Internal Shaft Henderson Granite EarthLab/ Geoscience Area Midway Campus Elev. 5850 ft, (5100 mwe) Lower Campus Elev. 4900 ft. (5800 mwe) Henderson DUSEL Layout

10. RQD 90-100 75-90 50-75 25-50 < 25 RQD DUSEL Exploration Hole 001 Section Average RQD = 92 (Very Good) Three < 10 ft fracture zones Plan

11. 7625 shaft station 7500 shaft station PC2 Conveyor to Mill Site LA Ramp Central Campus Elev. 6,800 ft (4300 mwe) DC1 Ramp Dedicated Exhaust Drift Fresh air Primary Access Ramp Exhaust air Secondary Access Ramp Crusher 7065 Level PC1 Conveyor Henderson DUSEL Central Campus Access

12. 7500 Level 1st Drill Hole 7065 Level Primary Access Ramp Secondary Access Ramp Central Campus Elev. 6800 ft EarthLab/ Geoscience Area Midway Campus Elev. 5850 ft 2nd Drill Hole Internal Shaft Lower Campus Elev. 4900 ft Access Ramps

13. Primary Access Ramp (to main shaft) Central Campus Elev. 6800 ft Secondary Access Ramp (to crusher) Exhaust Drift Ramp to Midway Campus Internal Shaft Ramps

14. Internal Shaft (winze) – Top at Central Campus • 20 ft diameter • Concrete lined • Capacity 5 ton • Capacity 20 people • Sink top down • Keep sinking bucket for hoisting Lower Campus excavation rock

15. Shaft Cross Section

16. Access Ramp Cross Sections Muck Haulage Shipping Container

17. Ventilation Shaft #2 Shaft 8100 Shop (2500 mwe) Mining Area PC2 Conveyor to Mill Site 7500 Level (3300 mwe) Upper Campus Layout

18. Upper Campus Layout

19. Central & Lower Campus Isometric

20. Central & Lower Campus Building Blocks

21. Central Campus Layout

22. Central Campus Layout w/ Large Multi-Purpose Detector

23. Lower Campus

24. Infrastructure Design Life Criteria • Suggested initial design life (capacity only) • Lab life—50? years • Drift cross section—sized for full expansion • Duct size—20 years • Power conductors—20 years • Power transformers—10 years • Chiller piping—20 years • Chiller plant—10 years • Communications—10 years

25. Lab vs. Infrastructure Development Plan

26. Development Sequence

27. Fire & Life Safety Concept

28. Lower Campus FLS Provisions

29. Lower Campus FLS Provisions

30. Fire & Life Safety Next Steps • Meeting with MSHA and OSHA Regional offices on March 30, 2006 • Meeting with Clear Creek County building code officials on March 31, 2006 • Objective—MOU defining jurisdictions, codes, etc.

31. Ventilation System Electrical System Incl. redundant, backup and emergency systems Fire and Life Safety Compartmentalization Monitoring & alarm Fire suppression Fire separations Egress routes & exit indicators Security stations Refuge Chambers Evacuation Routes Water & Wastewater Systems Data Systems Personnel control Control room w/ CCTV Cameras Personnel monitors Paging system Emergency & rescue systems Ambulance & fire truck Emergency cabinets Blast doors Henderson DUSEL System Design

32. System Conceptual Design • Basic services: • Provided to occupied Upper, Central and Lower campus areas • Power, air, potable water, fiber communications, lighting, emergency safety systems and selected drainage • Ventilation systems: • Provided to Upper, Central & Lower Campuses • Basic normal and emergency ventilation • Distribution systems • Central services: • Terminate at the experiment caverns for tenant connections • Fresh air, chilled water, power, process piping, communications, and safety systems

33. Ventilation & Cooling Design Criteria • Virgin rock surface temperatures: • 90°F at upper campus • 107°F at central campus • 142°F at lower campus • Projection of bore hole temperature readings • Heat transfer coefficient • 0.098 Btu / hr-ft2 -°F after 720 days • Based upon published data • Mine ventilation air • Supplied to the central campus at 78°F

34. Ventilation Systems • Access & egress tunnel ventilation • Normal Upper, Central & Lower campus ventilation • Interconnecting drifts ventilated using mine air (no A.C.) • Caverns have conditioned air (chilled water coils, electric heating coils to control humidity, filtration) • Clean space ventilation system • Safety ventilation systems • Compartmentalization smoke ventilation • Smothering gas ventilation • Central exhaust system • Special exhaust system • Special process exhaust, toilets, flammable liquid, etc. • 10,000 cfm each at Central & Lower Campus

35. Cooling • Each campus will have a chilled water loop • Estimated Immediate Cooling Load • Upper Campus 25 Tons • Central Campus 85 Tons • Lower Campus 175 Tons • Estimated Future Cooling Load • Upper Campus 90 Tons • Central Campus 395 Tons • Lower Campus 430 Tons

36. Plumbing • Water systems • Potable via bottles • Non potable from mine system, stored in tanks • Sanitary waste • Lift station to a holding tank, periodic transfer to surface • Gray water • 500 gpm total flow • Sumps at Central, Midway and Lower Campus • Pumped into the Henderson mine water system

37. Process Utilities & Fire Protection System • Process utilities • Central nitrogen gas system • Compressed gas system • Clean dry compressed air • Cryogen relief • De-ionized water system • Fire protection system • Each campus will have a wet pipe sprinkler system • Drift standpipe systems • Fire protection water storage tanks

38. Lighting • Normal lighting • Caverns 30 foot-candles (either metal halide or fluorescent depending upon height) • Office, lunch, shops at 50 fc • Miscellaneous at 20 fc • Egress routes at 1 fc • Emergency lighting

39. Power • New feed from the surface at 13,800 V • Unit substations at each campus • 277/480V for lighting & power to mechanical systems • 120/208V for receptacles • Demand • All campuses, immediate: 2975 kVA • All campuses, future increment: 3990 kVA • All campuses, total: 6965 kVA

40. Emergency Systems • Emergency power • Fire alarm system • Surveillance cameras • Access control • Security • Duress alarm • Asset locator • Personnel emergency device & tracking

41. Communications • Backbone cabling • Single-mode fiber • 10-gigabit Ethernet • 192 strands of fiber from surface and to each campus • Campus cabling • Category 6 unshielded twisted pair

42. Site Placement • Visitor Center – Interface with Public • Parking – Relationship to Office • Offices, Laboratories, Warehouse and Shops – Achieve a campus grouping of buildings • Dormitory & Cafeteria - Location to be determined, near campus • Future Expansion - Post Mine closure

43. Surface Buildings • Surface Building Program • Visitor’s Center total 50,000 sf to yr 15 30,000 sf • Admin/Offices/Laboratories total 85,000 sf to yr 15 65,000 sf • Dormitory & Cafeteria total 35,000 sf to yr 15 35,000 sf • Assembly, Shops & Storage total 25,000 sf to yr 15 25,000 sf • Existing Facilities (available after about 2026) • Office Building 87,759 sf • Surface Shop 26,000 sf • Shaft Hoist House 9,600 sf • Surface Warehouse 14,000 sf • Building reuse issues • DUSEL program needs & phased buildout • Existing building locations