successful heap leach gold mining the tropicsheap leaching has been around for 550 years years >...
TRANSCRIPT
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Successful Heap Leach Gold Mining the Tropics
Doug Kirwin-GEOCON Manila, December 4-5th 2019.
Gold Exploration Muab River, West Papua, Indonesia,2014
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PRESENTATION OUTLINE
➢ What is heap leach gold mining?
➢ Some examples from Indonesia and Myanmar
➢ What are the important criteria?
➢ What are the economic and social advantages?
➢ Questions?
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Heap Leaching has been around for 550 years years
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> 150 operating heap leach gold mines
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Very Simple Technology
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Enhanced permeability
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Heap leach gold mining in Nevada in the late 1960’s
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Heap Leach Gold Mining Kişladağ, Turkey (Eldorado Gold Corp).
150,000 ozs Au pa 1.1 g/t Au ASIC $600/oz
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Heap leaching in the tropics – too much water ??
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Seruyung
Bakan
Tumpangpitu
Location of significant Indonesian heap leach gold mines
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Seruyung Hill prior to mining
Discovered May 8th, 1994
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Ada Rey open pit, Seruyung gold mine
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Central Zone and Western Breccias, Seruyung
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2012-2018 360,000 ozs ASIC <$450/oz
12 heaps, 4-8m lift
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Overview of leach pads and gold plant, Bacan mine.
Leo Subang photo
2013 - 2018 434,600 ozs ASIC $600
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Main Ridge pit, Bacan gold mine, Suluwesi
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Overview of the Bakan gold processing plant
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Mobile crushers, Bacan leach pads
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Stacking and lime mixing at the leach pads
13 cells 5 meter lifts 35 days
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Oxide ore 0.7 g/t Au, Osela North pit
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View looking towards Osela South pit.
Leo Subang photo
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Tujuh Bukit Project
Aerial view looking SE at the Tujuh Bukit Project (2012)
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Aerial view looking West towards Pulau Merah
Exploration Office
Tujuh Bukit Project
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Tujuh Bukit Project
PIT C
PIT BW
PIT E
PIT A
PIT BE
Aerial view looking North towards Pulau Merah
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Main leach pad >180,000 Au ozs 2019.
2017 -2018 308,000 ozs Au ASIC <$530
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Tampangpitu overview
Gold plant
Water retention pond
Pregnant solution
Crushed ore heaps
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Water retention reservoir
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Stacked heaps 10m lifts
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Cyanide reticulation grid network
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High grade vuggy silica ores 2 – 5 g/t Au
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Possibilities in the PhilippinesMapawaTampakanParacaleNalisbitanPlacerMinlawiHixbarKing KingMarcopperMarianOthers
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➢ Crushing size - leach well tests/bottle roll
➢ Clay analysis – distribution (Screening-clogging)
➢ % oxide-mixed oxide and primary
➢ Cu contents
➢ RQD model
➢ Sources for aggregate (base for pads)
➢ Sources for cement (agglomeration)
➢ Space for leach pads, water retention system
➢ Environmental and social impact study
WHAT WE REALLY NEED TO KNOW
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Illegal large scale open cast strip mining, Loi Kham, northeast Myanmar
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Large scale Illegal heap leach gold mining, Loi Kham, northwest Myanmar
8 kms
(50 sq kms of total environmental devastation)
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Responsible Heap Leach Gold Mining Can Be Very Successful
✓ Low CAPEX and OPEX compared to conventional mining
✓ Simple mining and well understood metallurgy
✓ No requirements for tailings dams
✓ Proven ability to operate in high rainfall situations
✓ No acid rock drainage issues with oxide deposits
✓ Compelling economics at 0.3 g/t Au cut off (>500,000 ozs)
✓ Could have application for waste dumps from previous mining
✓ Straight forward environmental rehabilitation
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Thank you for your kind attentionThank you for your kind attention