November 11, 2004 Biogeohydrological Environment and Physical Aspects of the Henderson Mine Site...
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Transcript of November 11, 2004 Biogeohydrological Environment and Physical Aspects of the Henderson Mine Site...
November 11, 2004
Biogeohydrological Environment and Physical Aspects of the Henderson
Mine Site
Climax Molybdenum Company
Henderson Operations
November 11, 2004
Surface Geologic Features
Shannon, Nelson, & Golden (2004)
November 11, 2004
Surface Geology of District
Shannon, Nelson, & Golden (2004)
November 11, 2004
Geologic Section of District
Shannon, Nelson, & Golden (2004)
November 11, 2004
GeologyClassic Climax-type porphyry molybdenum deposit
Host rock is granite/aplite porphyry
474,000 feet of core drilling
Limited accessory mineralization
November 11, 2004
Block Diagram of Henderson / Urad System
November 11, 2004
Classification of Molybdenum Deposits
November 11, 2004
Geologic Section of Climax Deposit
November 11, 2004
Generation of Henderson Deposit
November 11, 2004
Vein Development
November 11, 2004
Sequence of Intrusions – A, B
November 11, 2004
Sequence of Intrusions – C, D
November 11, 2004
Sequence of Intrusions – E, F
November 11, 2004
Sequence of Intrusions – G, H
November 11, 2004
Sequence of Mineralization
November 11, 2004
Henderson Alteration Zones
November 11, 2004
Geologic Structure on 7700 Level
November 11, 2004
DUSEL Schematic with Geology
Red Mountain - Mine Harrison Mountain
Central Campus, Elev. 6750 ft, (4200 mwe)
Midway Campus, Elev. 5825 ft, (5100 mwe)
Lower Campus, Elev. 4900 ft. (6000 mwe)
EarthLab/GeoscienceArea
Red MtOrigional Topography
Harrison Mt
Internal Shaft
Access Ramp
November 11, 2004
Core Run from Henderson Deposit
November 11, 2004
Existing Core Drilling
•606 holes totaling 474,000 ft (90 miles) have been core drilled at the Henderson site.
•Assuming a cost for core drilling of $50/ft, the value of this drilling would be $23,700,000.
•Henderson management intends to make the existing portion of these cores available for study by the scientific community as part of the DUSEL.
•This transfer will provide an unprecedented level of information to support the development of the DUSEL geoscience program.
November 11, 2004
Shaft CollarElev 10,400 ft
Shaft BottomElev 7,500 ft
LA Ramp
9HW Drift
Central CampusElev. 6,750 ft(4200 mwe)
Access Ramps
UNO
PC2 Conveyor to Mill Site
7065 Level
Crusher
PC1 Conveyor
7500 Level
2500 ft Drill HoleCompleted Sept 11,2004
Initial Core Drilling Harrison Mountain
A 2500 ft core hole has been drilled from the 9HW drift through the Central Campus area.
Initial geologic logging shows the rock mass to be very competent Urad Porphyry (RQD >85)
November 11, 2004
Plan View of DUSEL Drillhole
November 11, 2004
Section View of DUSEL Drillhole
November 11, 2004
Drill Hole Piercing Proposed Lab Site (1)
• The hole is 2,500 feet in length
• The hole had an inclination of -26 degrees with the top at the 7,500 feet and the bottom at 6,300 feet.
• The hole was drilled at HQ-3 (2.4 inches in dia.) for 1,397 feet and NQ-3 (1.8 inches in dia.) for 1,102 feet.
• Hole deviation was less than 200 feet
• Geological logging is complete
November 11, 2004
Drill Hole Piercing Proposed Lab Site (2)
• The rock is a rhyolite or aplite porphry
• The rock is very hard with a high percentage of quartz.
• The rock is expected to have a high compressive strength (this will be tested)
• The RQD is quite high, 70 – 100.
• There is little evidence of mineralization
November 11, 2004
Drill Hole Piercing Proposed Lab Site (3)
• There were only a few small fractured zones, not near the Laboratory area, and no major fault zones
• There is very little water, only about 1.5 gpm.
• Due to the hardness and strength, there is some potential for rockbursting when mining. This potential is no greater than what has been experienced at Henderson in the past.
November 11, 2004
Hydrogeologic Environment (1)
• Intrusive rocks with very low primary permeability
• Ground water restricted to discrete zones of high flow
• Existing porosity & permeability are secondary and result from fracturing.
• Porosity and permeability are not related to rock type
• Water is being mined
• Recharge is insignificant
• 741 gallons of water / cubic ft of excavation on 8035 /L
November 11, 2004
Hydrogeologic Environment (2)
• Henderson 2000 project experience:
Inflows 10’s of gpms rather than 100’s or 1000’s of gpms
Max inflows of 30-40 gpm from any specific structure
Water handled by excavation of periodic sumps during mining of ramps downward
Water generally warm to hot on lower levels, ~120 degrees F
• Vasquez Fault - major source of high water inflows and pressures encountered during 100+ miles of drifting
November 11, 2004
Biogeologic Environment
• Biogeologic conditions have not been studied
• Geologic environment contains:
Warm to Hot water
Sulfide Mineralization
• Similar environments in mine waste dumps are known to host sulfide-consuming bacteria
November 11, 2004
Summary of Henderson Site Privately owned 11.7 km2 area with access to several km depth Existing Infrastructure and access
Large diameter shaft Existing ventilation system Rock handling system Redundant electrical power – 114KV transmission lines Communication – Fiber-optics
Close to Denver and International Airport No permitting will be required for excavations or drilling programs Extensive core drilling exists, geology of site well known Area under Harrison Mt is competent Urad Porphory and is likely to be
well suited for large excavations required for physics experiments. Area under Red Mt provides access to a highly variable geologic
environment hosting a 360 million ton molybdenum deposit. Red Mt area provides site for geoscience experiments in hydrogeology,
fluid flow, etc… Site provides access to large volumes of uncontaminated rock for
biogeology research and experiments.
November 11, 2004
The End
Climax Molybdenum Company
Henderson Operations