THE AJ MINE

13 Pages·2011·0.11 MB·English

WHAT IS THE SMALL MINE CONCEPT?
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BASIS OF STUDY
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WHAT ARE THE FEATURES OF THIS
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CONCEPT COMPARED TO ECHO BAY’S
ORIGINAL CONCEPT?
WHAT ARE ISSUES RELATED TO
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REOPENING THE AJ?
TTHHEE AAJJ MMIINNEE
PRODUCTION RATE
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MINING METHOD
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TAILING DISPOSAL METHODS
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UG TAILING DISPOSAL
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UNDERGROUND FACILITIES
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SURFACE FACILITIES
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NOISE
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TRAFFIC
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EMPLOYMENT OPPORTUNITIES
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FINANCIAL IMPACT ON JUNEAU
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WATER QUALITY
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WWHHAATT IISS TTHHEE SSMMAALLLL MMIINNEE
CCOONNCCEEPPTT AANNDD TTHHEE MMAAJJOORR IISSSSUUEESS??
• ORE PRODUCTION RATE: 3,500 TONS/DAY MINED
• MILLING RATE: 2000 TONS/DAY
• WASTE ROCK PRODUCTION: 2000 TONS/DAY OF
ROCK AVAILABLE FOR SALE OR OTHER SURFACE
USES
• ORE RESOURCE: 12.8 M TONS OF ORE (INCLUDES
DILUTION)
• MINE LIFE: 12.8 YEARS
• REVENUE OUNCES OF GOLD: 782,000 OVER MINE
LIFE
• AVERAGE GRADE OF MINED ORE: 0.074 OUNCES
PER TON
• AVERAGE GRADE OF MILLED ORE: 0.118 OUNCES
PER TON
PPRROODDUUCCTTIIOONN RRAATTEE
MMIINNIINNGG MMEETTHHOODD
THE MINING METHOD ANALYZED IN THE
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SMALL MINE ANALYSIS IS “LONG-HOLE OPEN
STOPING.” IT CONSISTS OF RELATIVELY
LARGE STOPES ROUGHLY 150 FT LONG BY
150 FT WIDE BY 200 FT HIGH.
THIS METHOD IS MORE SELECTIVE THAN
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BLOCK CAVING USED BY THE AJ IN THE OLD
DAYS, OR SUB-LEVEL STOPING USED IN THE
LARGE MINE ANALYSIS.
LONG-HOLE OPEN STOPING WOULD NOT
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RESULT IN NEW CAVING
UNDERGROUND DISPOSAL METHODS
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◦ DRY TAILINGS
◦ PASTE
◦ PASTE WITH CEMENT
◦ HYDRAULIC BACKFILL
SURFACE DISPOSAL
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◦ NOT RECOMMENDED
SUBMARINE DISPOSAL
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◦ NOT RECOMMENDED
TTAAIILLIINNGG DDIISSPPOOSSAALL MMEETTHHOODDSS
UTILIZE EXISTING UNDERGROUND
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OPENINGS
◦ CAPACITY OF DEEP NORTH STOPES: 8.2 M TONS
CAPACITY OF NEWLY MINED STOPES
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◦ CAPACITY OF NEW STOPES: 7.7 M TONS OVER
PROJECT LIFE
TOTAL CAPACITY OF STOPES: 15.9 M TONS
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REQUIRED CAP. FOR DISPOSAL: 6.1 M
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TONS
CONCLUSION - THERE IS PLENTY OF ROOM
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TO DISPOSE OF TAILINGS UNDERGROUND.
UUNNDDEERRGGRROOUUNNDD TTAAIILLIINNGG
DDIISSPPOOSSAALL
UUNNDDEERRGGRROOUUNNDD FFAACCIILLIITTIIEESS
ORE AND ROCK WASTE MOVEMENT WOULD TAKE
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PLACE ALONG ROADWAYS, THROUGH ORE
PASSES, AND BY RAIL AND IN MINE HOISTING
FACILITIES
ORE SORTING, GRINDING AND CONCENTRATING
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WOULD TAKE PLACE IN THE UNDERGROUND
MILL FACILITY
PROCESSING OF TAILING MATERIAL AND
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DISPOSAL WOULD TAKE PLACE UNDERGROUND
WAREHOUSING OF SUPPLIES AND EXPLOSIVES
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EQUIPMENT MAINTENANCE SHOPS
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WATER TREATMENT FACILITIES
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POWER GENERATING
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AN ADIT LOCATED NEAR SEA LEVEL –
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PREFERABLY BETWEEN THE OLD AJ
STEAM PLANT AND “LITTLE ROCK DUMP”
TO ACCESS THE OREBODY
MINE OFFICE, CHANGE HOUSE,
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WAREHOUSE AND ROCK STORAGE
POWER GENERATION (MAY ALL BE
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UNDERGROUND)
SSUURRFFAACCEE FFAACCIILLIITTIIEESS
NNOOIISSEE
NOISEY EQUIPMENT SUCH AS SCOOP
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TRAMS, TRUCKS AND MAN TRIPS WOULD
RARELY BE OUTSIDE OF THE MINE
CRUSHING AND GRINDING WOULD BE
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UNDERGROUND
BLASTING WOULD ALL BE UNDER-GROUND
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AFTER INITIAL PORTAL DEVELOPMENT
WASTE ROCK HAULAGE FROM ADIT AND
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STOCKPILING OF ROCK ON THE SURFACE
NOISE BARRIERS WOULD BE CONSTRUCTED
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ON THE SURFACE AS REQUIRED
TRAFFIC TO AND FROM THE MINE PLANT
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SITE WOULD BE LIGHT EXCEPT AT SHIFT
CHANGE
PARKING NEAR THE PLANT SITE IS
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EXPECTED TO BE DIFFICULT DEPENDING
ON THE FINAL LOCATION OF THE ADIT
THE MINE OPERATOR SHOULD BE
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ENCOURAGED TO PROVIDE BUS
TRANSPORT BETWEEN THE PLANT SITE
AND SATELLITE PARKING AREAS
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