Download - Narrow Vein Mining Citicorp
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Chris TowseyChris TowseyChief Operating Officer, Citigold Corporation LtdChief Operating Officer, Citigold Corporation Ltd
Narrow Vein Mining. CASE STUDY.Narrow Vein Mining. CASE STUDY.Citigold’s perspective on weighing up the Citigold’s perspective on weighing up the benefits against the challenges of narrow benefits against the challenges of narrow
vein miningvein mining
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1000 km625 miles
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4 kilometres
Railw
ay
Previous mining (yellow) developed200km of underground drives andproduced 6.6 million ounces of gold
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Processing Plant
Tailings dam
Stockholmmine
Washingtonmine
Declineportal
0 1km
XWarrior
mine
Warrior Mine
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Diagram from Peters, 1987. EGRU Contrib 19
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No. 2 Cross Vein(Maude St. Leger reef)
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No. 2 Cross Vein (Maude St. Leger reef)
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Processing Plant
Tailings dam
Stockholmmine
Washingtonmine
Declineportal
0 1km
XWarrior
mine
Warrior Mine
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Development PlanWarrior mine & gold resource – Long section
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Development PlanWarrior gold resource – drilling Cross Section
Cross sectionLooking West
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BENEFITS OF MECHANISEDBENEFITS OF MECHANISEDNARROW VEIN MININGNARROW VEIN MINING
Low mining cost per ounceLow mining cost per ounce–– low tonnage to break, haul and milllow tonnage to break, haul and mill–– high grade per tonne high grade per tonne –– 13 13 g/tg/t–– floor of drive preservedfloor of drive preserved
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Mining method:Longhole open stoping10m sub-levels
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Atlas Copco Simba
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BENEFITS OF MECHANISEDBENEFITS OF MECHANISEDNARROW VEIN MININGNARROW VEIN MINING
Low mining cost per ounceLow mining cost per ounce–– low tonnage to break, haul and milllow tonnage to break, haul and mill–– high grade per tonne high grade per tonne –– 13 13 g/tg/t–– floor of drive preservedfloor of drive preservedSafer than handSafer than hand--heldheld
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MechanisedCut and fill
Shrink stoping
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Mining method:Longhole open stoping10m sub-levelsExpansion slot byvertical crater retreat
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BENEFITS OF MECHANISEDBENEFITS OF MECHANISEDNARROW VEIN MININGNARROW VEIN MINING
Low mining cost per ounceLow mining cost per ounce–– low tonnage to break, haul and milllow tonnage to break, haul and mill–– high grade per tonne high grade per tonne –– 13 13 g/tg/t–– floor of drive preservedfloor of drive preservedSafer than handSafer than hand--heldheldAccurate grade controlAccurate grade control
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9.6 g/t Au1.1 g/t Au 7.0 g/t Au
Grade variationGrade variation
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No. 2 Cross Vein in stope pillarshowing rapid pinch-out
0.1m
0.2m
0.7m
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CHALLENGESCHALLENGES
Dilution Dilution –– planned and unplannedplanned and unplanned
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Planneddilution
Ore
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Overbreak
Unplanned dilution
Cross section
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Ore SortingDilution removed by ore sorting
Photometric ore sorter
The 30% waste and
dilution removed
by sorting
Feed screenedand washed
OREWASTE
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CHALLENGESCHALLENGES
Dilution Dilution –– planned and unplannedplanned and unplannedMultiple working faces requiredMultiple working faces required
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Conventional long-section view of a shoot within a planar structurePayability of structure 30%
Drill pierce pointsbelow cut-off
Drill pierce pointsAbove cut-off
Extraction levels
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Charters Towers structure with payable areas – no defined shootPayability of structure 30%70% chance of a barren hole
Drill pierce pointsbelow cut-off
Drill pierce pointsAbove cut-off
Extraction levels
Stope blocks
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CHALLENGESCHALLENGES
Dilution Dilution –– planned and unplannedplanned and unplannedMultiple working faces requiredMultiple working faces requiredFlatFlat--dipping stopes dipping stopes –– difficult muckingdifficult mucking
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Stope cleaning of 10m x 20m panelswill use water-jets rather than scrapers
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Ore is jetted down the stope to a gully or sump
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Mining CostsMining Costs
222853352TOTAL COST 21844ADMINISTRATION 5202SURFACE HAULAGE
4517710PROCESSING 151582236Sub-total 7429623Development 77291613Production
MINING
Total$/oz
Total$/Tonne
Ore
Labour$/Tonne
Ore
Materials$/Tonne
Ore
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Thank you